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gigaBERT700 - Advanced Test Equipment Rentals

1. GB700 User Manual 2 15 BERT Basics and Feature Overview Controls and Indicators All of the controls indicators inputs and outputs found on the Generator or Analyzer front or rear panels are introduced in this section For more detailed descriptions and setup procedures using these controls and indicators see Chapters 3 4 and 5 Power Switches The Generator and Analyzer are both equipped with two power switches O ON STBY front panel C ON OFF rear panel You should normally leave the rear panel ON OFF power switch on and use the front panel switch to power or de power the instrument View Angle and Panel Lock Keys The PANEL LOCK and VIEW ANGLE keys are located near the top left corner of the front panel O VIEW ANGLE Use this key to select the optimum LCD viewing angle O PANEL LOCK Use this key to lock and unlock the front panel While the front panel is locked all keys that can cause setup changes are disabled This feature can help prevent accidental loss of data when performing long term or critical tests V NOTE To return the Generator or Analyzer to factory default settings depower the instrument and then re power it while pressing and holding the VIEW ANGLE MSB 1 and PATTERN CLEAR keys at the same time Release these keys after the message Default Setup appears in the display GPIB Section Controls There are two keys in the GPIB section O ADDR Key used to set GPIB address in
2. 3 The ORDER function appears under the F2 key in units not equipped with the 128K Option NOTES GB700 User Manual Menu Functions Table 6 3 Generator Menu System Overview MORE EXIT to Normal mode MORE PARITY ESC XON XOFF to MAIN Menu MORE LENGTH ESC to MAIN Menu UTIL ESC OPTION to MAIN Menu NOTES 1 Menu names appear in bold typeface PSYNC 2 Functions included only in instruments equipped with the 128K Option are marked with an asterisk 3 The ORDER function appears under the F2 key in units not equipped with the 128K Option 6 8 GB700 User Manual Menu Functions Menu Function Definitions This section describes each menu function included in the gigaBERT700 menu system For each function you will find the following information 1 Naar wh 8 Its basic display format The menu in which it is located The function name used in the menu system Whether it is found in the Analyzer Generator or both Which option s must be installed for this function to be available What this function is used for Parameters set using this function and their ranges Notes Note that most of the following function descriptions are identified by a menu name and a function name for example Test Length This is to clarify the application of the described function and to differentiate functions that have the same name for example Word Mode and Window Mode Also
3. 7 for 128k option le 8 or 16 Example word mem len 5 16 sets the length of word memory 5 to 16 bits V NOTE There is no query form to this command However you can use the word memory m query to read the length of the word saved at location m 8 22 GB700 User Manual Remote Commands word mem ord m msb 1sb Word Memory Order Sets the bit order of the word saved at location m to either msb most significant bit first or Isb least significant bit first Min Abbr word mem o Arguments m 0 1 9 0 7 for 128k option msb most significant bit first Isb least significant bit first Example word mem ord 9 msb selects the most significant bit first order for word memory location 9 word mem ord Word Memory Order Query All Returns a command string MSB or LSB indicating the bit order of each of the 10 word memory locations The response will consist of 10 message units 8 for 128k option Min Abbr word mem o Returns lt NR1 gt MSB I LSB lt NR1 gt MSB LSB etc Example word_mem_ord command WORD_MEM_ORD 0 LSB response WORD_MEM_ORD 1 MSB WORD_MEM_ORD 2 MSB word_mem_ord m Word Memory Order Query Returns a command string MSB or LSB indicating the bit order of the word saved at location m Min Abbr word_mem_o Arguments m 0 1 9 0 7 for 128k option Returns MSB or LSB Example word_mem_ord 1 command W
4. This may be accomplished by using SMA to BNC adapters and 75 ohm BNC coaxial cables See Figure 1 for Setup of Functional Test Q Step 2 Reset both the Generator and Analyzer to their factory default settings Press the CLEAR key in the PATTERN section the MSB 1 key and the VIEW ANGLE key and hold down all three keys while cycling the power The message DEFAULT SETTINGS should appear briefly on the display of each unit followed by the gigaBERT700 logo before the functional display appears Q Step 3 At the Generator verify that error injection is off you should see ERR OFF on the display If error injection is on press the SINGLE key in the ERROR INJECT section to turn it off D 2 GB700 User Manual Customer Acceptance Test gigaBERT 700 GENERATOR Data Clock Not Clock gigaBERT 700 ANALYZER Not Clock Data Not Data Figure 1 Setup for Functional Test of Standard Instrument GB700 User Manual Not Data D 3 Customer Acceptance Test O Step 4 At the Generator verify that PRBS is selected the PRBS LED light in the PATTERN section should be on If not press the PRBS key to select it Q Step 5 At the Analyzer press the CLEAR key in the ERROR DETECTION section and the CLEAR key in the ERROR HISTORY section to clear the error display and the error history LED lights All four history LEDs should be off Because the Analyzer defaults to Auto
5. Saving a Frequency You may save the current Generator frequency into one of 10 frequency memory locations as follows Procedure 1 Press the clock SAVE key Verify that the SAVE LED is flashing 2 Press the clock section up down keys to select the desired memory location Note that frequency memory location is displayed in the bottom left field of the display as FREQ x where x 0 1 9 3 Then press SAVE a second time to save the current frequency into this location Verify that the clock SAVE key LED turns off Recalling a Frequency You can recall a previously saved frequency as follows Procedure 1 Press the clock RECALL key and verify that the RECALL LED turns on 2 Press the clock up down keys until the display shows the desired frequency top left and frequency memory location bottom left V NOTE The displayed frequency becomes the current frequency immediately That is you do not have to hit RECALL again 4 4 GB700 User Manual Generator Functions Data and Clock Outputs This section explains how to set up the Generator s clock and data outputs as well as related pattern sync and clock 4 outputs Overview The OUTPUT section of the Generator front panel contains the instrument s main NRZ clock data outputs U DATA LJ DATA BAR L CLOCK U CLOCK BAR DATA and CLOCK are the non inverted test pattern outputs of the gigaBERT700 Generator DATA is a non return to zero NRZ data si
6. Windows Time Query Returns either the elapsed time in the current window so far or the duration of the previous window depending on the setup of the WIN_PREV parameter Min Abbr win_t Returns lt qstring gt in the format ddd hh mm ss where ddd days 0 to 999 hh hours 0 to 23 mm minutes 0 to 59 and ss seconds 0 to 59 Example win_time command WIN_TIME 000 01 00 00 response 8 78 GB700 User Manual Remote Commands PRINT Setup Commands print enable on off Print Enable This command turns the master Analyzer Print Enable parameter on or off When Print Enable is off then no reports will be printed When Print Enable is on then all enabled reports will be printed Remember that individual reports will not print unless they are enabled individually and Print Enable has been set to on Min Abbr Arguments Example print_e on enabled reports will print off no reports will print print_enable on print_enable Print Enable Query Returns the current state of the Print Enable parameter Min Abbr Returns Example print_e onjoff print_enable command PRINT_ENABLE ON response print_port parallel gpib serial Print Port This command selects the port on which all Analyzer reports will be printed Min Abbr Arguments Example GB700 User Manual print_p parallel selects the rear panel PRINTER port gpib selects the rear panel GPIB
7. sssse 8 39 clock offset V aee eiie ttt E NO T sae eho weed 8 39 clock offset ies ke id 8 39 clock source mt l ext iiie er nere howe 8 34 Ad ae dai eio ee E s a eR ubas 8 34 Clock step Ty linia Gs e D mh di e GMAT 8 34 clock Step Sound A 8 35 clock stp up and clock stp dn eene 8 35 clock stp up v and clock stp dn v 8 35 clock tern graines 22V acce e rather ii 8 36 clock term neg 2v gnd acl pos 3v essssss 8 54 Clock A tetra o oderit cs net rer 8 36 Clock t rm eet etre tese dete donee Oe aru cato echten dE 8 55 clock thr up and clock thr dn eee 8 55 clock thr up v and clock thr dn v 8 55 clock tres la rte eoo ere e ete e te erba 8 56 clock tr r4 M a 8 56 data amp up and data amp dn sse 8 39 data amp up v and data amp dn v 8 40 data ampl a 8 40 data ai tt vo teo c snae te abest eR 8 40 data del up and data del dn sss 8 56 data del up v and data del dn v 8 57 data delas hast e ida 8 57 AGA A ee 8 57 data inputs melo IT nana id 8 58 data THDUbU doo A A A 8 58 data inyePpt on loff ptt taber teinte ple Dati Ri 8 19 A wanes 8 19 data off up and data off dii ie rm esta pervia tus 8 4
8. 6 24 Window Reports REPORT 6 27 Word Edit EDIT 6 10 Word Fill FILL 6 12 Word Length LENGTH 6 11 Word Order ORDER 6 13 Word Sync Pulse PSYNC 6 14 Word Synchronization Threshold SYNC 6 15 Menu Overview 2 22 Menu Summaries 6 6 O Outputs amp Inputs 2 10 Analyzer INPUT 2 11 Analyzer MONITOR 2 12 Analyzer Rear Panel 2 12 Connectors Terminations and Levels 2 14 Generator CLOCK 2 11 Generator OUTPUT 2 10 Generator Rear Panel 2 11 P Printers and External Controllers Using 7 1 GPIB Status and Event Reporting System 7 13 Printer Basics 7 3 Remote Control Basics 7 2 Using the GPIB Port 7 8 Using the RS 232C Port 7 4 GB700 User Manual R Index Remote Commands 8 1 S Command Descriptions 8 12 Command Summary Alphabetical 8 7 Safety xii Self Check Procedure Initial 1 3 Specifications A 1 T Tables AC Power Fuse Types 3 2 Actions taken by Analyzer when Synchronization is Lost 5 3 Analyzer Inputs amp Outputs 2 15 Analyzer Menu System Overview 6 7 Command Examples 7 7 Commands that generate Multi Unit Responses 7 5 Data Inhibit Logic 4 13 External Clock Input Specifications vs Termination 4 3 Generator Inputs amp Outputs 2 14 Generator Menu System Overview 6 8 GPIB Interface Functions 7 4 How F2 F3 determine Input Set up 5 8 How to Tell which Display Mode is Active 5 18 Input Terminations for
9. SYNC OFF HISTRY SYNC ON HISTRY BITS ON HISTRY PHASE OFF HISTRY POWER OFF 8 66 GB700 User Manual Remote Commands histry_sync History Sync Indicator Query Returns a character string indicating the state of the SYNC Loss history indicator Min Abbr histry_sy Returns on off Example histry_sync command HISTRY_SYNC OFF response sync Synchronization Query Returns a character string indicating whether the Analyzer synchronization LOCK LED is on or off If it is on then the Analyzer is in pattern synchronization If it is off then the Analyzer is out of pattern synchronization Min Abbr sy Returns on off Example sync command SYNC ON response tt120 reset and tt120 error Totalize 20 ms Reset Totalize 20 ms Error These two commands are similar in function to the error reset and total error commands respectively However the two tt120 commands are better suited to make measurements over very short measurement intervals that is intervals less than one second The minimum time allowed between an error reset and a total error command is 500 ms This limit does not apply to the tt120 reset and tt120 error commands which will be processed as soon as they are received Moreover in addition to the error count the response to a tt120 error query will include the number of 20 ms intervals since receipt of the tt120 reset command Min Abbr tt120 r ttl20 e ttl20 reset arguments
10. clock_off_dn 0 10 clock_offset v Clock Offset Sets the baseline offset of the output clock signal to v volts Min Abbr clock_offs Arguments v lt NR2 gt in the range 2 00 to 1 80 in steps of 0 05 Example clock_offset 0 75 clock_offset Clock Offset Query Returns the current value of the output clock signal baseline offset Min Abbr clock_offs Returns lt NR2 gt Example clock_offset command CLOCK_OFFSET 0 75 response GB700 User Manual 8 39 Remote Commands data_amp_up and data_amp_dn Data Amplitude Up Down Default This command pair is used to increment or decrement the current amplitude of the Generator data output by a default amount of 0 05 volts Min Abbr data_amp_u data_amp_d Arguments none Example data_amp_dn data amp up v and data amp dn v Data Amplitude Up Data Amplitude Down This command pair is used to increment or decrement the current amplitude of the Generator data output by a specified step size of v volts Min Abbr data amp u data amp d Arguments v lt NR2 gt in the range 0 05 to 1 50 in steps of 0 05 Example data_amp_up 1 00 data_ampl v Data Amplitude Sets the amplitude of the Generator s data output signal to v volts Min Abbr data_ampl Arguments v lt NR2 gt in the range 0 50 to 2 00 in steps of 0 05 Example data_ampl 1 00 data_ampl Data Amplitude Query Returns the current amplitude setup of the Generator s data o
11. Example audio_vol_up 2 audio_vol_dn 2 GB700 User Manual 8 83 Remote Commands Misc Analyzer Commands date yyyy mm dd Date Sets the current date in year month day format Note that the argument is a quoted character string Min Abbr date Arguments yyyy year NOTE may be above 2000 mm month 1 2 12 dd day 1 2 31 Example date 2001 03 21 date Date Query Returns a quoted string that indicates the current date setup of the Analyzer in year month day format Min Abbr date Returns qstring Example date command DATE 2001 03 02 response time s Time Used to set the instrument s time of day clock Min Abbr ti Arguments S lt qstring gt in the format hh mm ss where hh hours 00 23 mm minutes 00 59 and ss seconds 00 59 Examples time 16 30 02 8 84 GB700 User Manual Remote Commands time Time Query Returns a quoted string indicating the current setting of the instrument s time of day clock Min Abbr ti Returns lt qstring gt Example time command TIME 16 30 11 45 response GB700 User Manual 8 85 Remote Commands 8 86 128K Option Commands The following section identifies commands that are modified or added when the 128K Option is installed Modified Commands When the 128K Option is installed the All mem command will operate as before except that it will not return any saved word patterns Replaced Commands
12. However if the character is blinking then the TEST process is already stopped and you should not press the CLEAR key until you want to start a new TEST interval Note that TEST measurement starting and stopping can be controlled manually or automatically depending on the selected timing mode When the Untimed mode is selected TEST intervals must be started and stopped manually by the user When the Timed mode is selected TEST intervals are started manually but stopped automatically after an interval determined by the LENGTH parameter in the TEST menu When the Repeat timing mode is selected once the TEST process has been started by the user new TEST intervals are stopped and then re started automatically at intervals determined by the LENGTH parameter However even when the Repeat mode is selected the overall TEST process can controlled by the user that is started and stopped manually Starting New Totalize and Window Measurement Intervals Unlike the TEST process the Totalize and Window measurement processes are continuous background processes that cannot be stopped and started by the user However you can clear all current results to start a new measurement interval as follows Procedure for Starting a New Totalize or Window Measurement Interval 1 Configure your Analyzer and Generator as desired 2 Select the desired display mode Totalize or Window 3 Atthis point you may press the ERROR DETECTION CLEAR key at any time
13. If the LED is on the clock source is external and an external source must be connected to the external clock input INPUT Procedure C Press the EXT key to toggle clock source between internal and external Step Size and Frequency The frequency of the Generator internal clock may be set using the FREQUENCY STEP and CLOCK section up down keys First select a step size Then adjust current frequency using this step size The complete setup procedure follows Procedure 1 Select a step size Do this by pressing the STEP key one or more times until the underscore in the frequency field is under the desired digit Note that the underscore moves right one digit for each key press The selected digit indicates step size For example if the current frequency is 622 950 MHz and the underscore is under the 5 then current step size is 10 kHz Or if the underscore is under the 9 then the current step size is 100 kHz etc 2 Press the FREQUENCY key Verify that the FREQUENCY key LED turns on GB700 User Manual 4 3 Generator Functions 3 Press the clock section up down keys to increment or decrement the current frequency using the previously selected step size Note that the underscore position indicates a step size not which digit will be edited For example if displayed frequency is 622 950 and the cursor is under the 9 then step size is 100 kHz and pressing the up T key one time will change frequency to 623 050 MHz
14. Returns a character string listing all of the options installed in the instrument or returns the character string NONE indicating that no options are installed Min Abbr op Returns string string etc where possible strings are 128K Indicates 128K Option installed PROM Indicates PROM Option installed 75 OHM Indicates 75 ohm Option installed NONE Indicates no options are installed Examples options command OPTIONS NONE response options command OPTIONS 128K PROM 75 OHM response options command OPTIONS 128K response view_angle v View Angle This command sets the LCD display viewing angle Min Abbr v Arguments v lt NR1 gt may equal 0 lowest 1 2 or 3 Example view_angle 2 view_angle View Angle Query Returns a decimal number indicating the current LCD display view angle setup Min Abbr v Returns lt NR1 gt Example view_angle VIEW_ANGLE 2 8 32 GB700 User Manual Remote Commands Generator Commands The following commands are found only in the Generator command set Clock Source and Frequency Setup Commands clock_freq v Clock Frequency Sets the clock frequency to a value v specified in Hz over the range of 150 kHz to 705 MHz in steps of 1 kHz Min Abbr clock_f Arguments v lt NR3 gt in the range 0 150E 6 to 705 000E 6 in steps of 0 001E 6 Example clock_freq 622 000E 6 clock_freq Clock Frequency Query Returns the current Generator clock fr
15. The name of the each defined bit in the TSR is shown in Figure 7 2 The function of each defined bit in the TSR is explained in Table 7 8 Figure 7 2 Test Status Register TSR Table 7 8 Test Status Register Bit Definitions m e 5 7 MSB Not defined PE Phase Error Set to one if a phase error has occurred A phase error is declared by the Analyzer when the phase relationship between CLOCK and DATA or CLOCK and REF DATA violates the instrument s setup or hold times SL Synchronization Loss Set to one if BER has exceeded the current synchronization SYNC threshold TE Threshold Error Set to one when a test is in progress and a Threshold Errored Second TES occurs A TES is a second in which BER is above the xus current Test Error Rate Threshold 1 Eor End of Test Set to one at the end of each TEST measurement interval 0 LSB EOW End of Window Set to one at the end of each WINDOW measurement fake Test Status Enable Register The Test Status Enable Register TSER is the enable register associated with the TSR status register Each enable bit in the TSER occupies the same bit position as the corresponding status bit in the TSR Note that the TSER enable register like the associated TSR status register is found only in the Analyzer GB700 User Manual 7 17 Using Printers and External Controllers Status Byte Register The Status Byte Register SBR indicates the overall status of the instrume
16. The standard gigaBERT700 Generator and Analyzer command set includes the following word commands C word bits C word memory C word length L word mem len These commands are limited to creating and editing short word patterns that is patterns that are 8 or 16 bits in length They will not work on long word patterns Instead long word editing functions are performed using byte commands which are added as part of the 128K Option Moreover byte commands also work on short words Therefore word commands have limited application in instruments equipped with the 128K Option However word commands will still function in units equipped with the 128K Option This insures that a Generator or Analyzer equipped with the 128K Option can replace a standard unit in automated applications designed to use standard short word commands New Commands When the 128K Option is installed all of the following commands are added to the Generator and Analyzer command sets except for the byte sync command which is added to only the Analyzer command set The following general rules apply to new 128K commands 1 Commands used to edit long words execute properly only when received after an edit begin command and before an edit end command These include CL byte length A byte fill C byte block C byte edit GB700 User Manual Remote Commands O byte insert O byte delete 2 If a command includes a bit address argument a then
17. Word Order Query Returns a character string MSB or LSB indicating the bit order of the current word Min Abbr word o Response MSB or LSB Example word order command WORD ORDER LSB response GB700 User Manual 8 25 Remote Commands GPIB and RS 232 Commands gpib_address v GPIB Address This command sets the instrument s GPIB address to v It may only be issued via the instrument s RS 232C port Min Abbr gpib_a Arguments v 0 1 30 Example gpib_address 15 gpib_address GPIB Address Query This command returns a decimal number indicating the instrument s GPIB address It may only be issued over the RS 232 port Min Abbr gpib_a Returns lt NR1 gt Example gpib_address command GPIB_ADDRESS 15 response gpib_bus off_bus talk_listen GPIB Bus Mode This command sets the instrument s gpib bus mode It may be used only over the RS 232C port Min Abbr gpib_b Arguments off_bus puts instrument in the gpib off bus mode In this mode it will not communicate over the GPIB talk_listen puts the instrument on bus asa talker listener Example gpib_bus talk_listen 8 26 GB700 User Manual Remote Commands gpib_bus GPIB Bus Mode Query Returns a character string indicating the current GPIB bus mode May be used only over the RS 232 port Min Abbr gpib_b Returns off bus talk listen Example gpib bus command GPIB BUS TALK LISTEN response rs echo onl off RS 232C
18. described in ANSI IEEE Std 488 2 1987 that are supported by the gigaBERT700 Table 7 4 GPIB Interface Functions Subst Implementation SH1 Complete source handshake AH1 Complete acceptor handshake T6 Basic talker serial poll no talk only unaddressed if addressed to listen no extended talker L4 Basic listener no listen only unaddressed if addressed to talk no extended listener Complete service request IP No parallel poll capability Complete device clear capability No device trigger capability No controller capability Tri state drivers used on DIO lines for maximum data transfer rate GPIB Connector Pin outs The gigaBERT700 GPIB port is equipped with a standard GPIB 24 pin D type connector The signal levels and pin assignments of this connector conform to ANSI TEEE Std 488 2 1987 Remote local capability including local lockout GPIB Command Format Please refer to Chapter 8 for an explanation of the general gigaBERT700 command format and a description of all commands Note that the basic command format used on the GPIB port is identical to that used on the RS 232C port GB700 User Manual 7 9 Using Printers and External Controllers ANSI IEEE 488 2 Programming Manual Requirements This section explains how the gigaBERT700 implements certain standard GPIB functions as required by ANSI IEEE Std 488 2 1987 Power On Settings When powered on the gigaBERT700 will automatically restore
19. none ttl20_error returns i e where GB700 User Manual 8 67 Remote Commands Example is a decimal number in lt NR1 gt format that equals the number of 20 ms intervals since the last tt120 reset in the range 0 50 corresponding to a measurement interval of 0 to 1000 ms 1 second A value at 1 indicates more than one second has gone by is a decimal number in lt NR1 gt format that equals the total number of bit errors counted since the last tt120 reset Note that if i 50 then e will equal the number of errors counted in the first second after the ttl20_reset Errors that occur more than one second after a ttl20_reset will not be included in the tt120_error count tt120_reset command tt120_errors command TTL20 7 349 response indicating 349 bit errors were counted in the 7x20 ms 140 ms between receipt of the tt120_reset and ttl20_errors commands GB700 User Manual Remote Commands TEST Setup Commands test_discard Test Discard This command discards all results from the previous test interval making previous results unavailable until the next test state RUN to STOP transition occurs Min Abbr test_d Arguments none Example test_discard test_length t Test Length This command sets the timed test interval This interval will be in effect only when the test mode is timed or repeat Min Abbr test_l Arguments t lt qstring gt in format hh mm ss where hh hours 0 to 24 mm
20. ns 8 23 Word DOT SOT a e 8 23 word MET ONE mila cita aida 8 23 word memory m le b1 b2 esses 8 24 word Memoria lito a Dy ed Ae PUER 8 24 word order msb ISb 55 ER as 8 24 WOPd DPder os oe ab obi o E tu 8 25 GB700 User Manual 8 11 Remote Commands Command Descriptions 8 12 The following section defines each gigaBERT700 set and query command Unless noted otherwise the following conventions will be followed in the command descriptions in later sections of this chapter Command Headers Command headers will be shown using the entire command name in lower case For legal abbreviations see the Command Summary Alphabetical section earlier in this Chapter Set and Query Command Pairs Commands that have both forms will be listed under the set command name For example the data threshold set and query commands above will be listed under the name DATA_THRES Common and Proprietary GPIB Commands The following GPIB common commands defined in ANSI IEEE Std 488 2 1987 els Clear Status This set command clears the Standard Event Status Register SESR and the event status bit ESB in the Status Byte Register SBR In addition it puts the instrument into the Operation Complete Command Idle State and the Operation Complete Query Idle State Min Abbr cls Example cls ese n Event Status Enable This command sets the Event Status Enable Register ESER to t
21. 000E 6 Example clock_step 1 000E 6 8 34 GB700 User Manual Remote Commands clock_step Clock Step Query Returns the current clock frequency step size Min Abbr clock_ste Returns lt NR3 gt Example clock_step command CLOCK_STEP 1 000E 6 response clock_stp_up and clock_stp_dn Clock Step Up Clock Step Down This command pair is used to increment or decrement the current Generator frequency using the step size previously defined with the clock_step command Min Abbr clock_stp_u clock_stp_d Arguments none Example clock_step_up clock_step_dn clock stp up v and clock stp dn v Clock Step Up Clock Step Down This command pair is used to increment or decrement the current clock frequency by v which can range from 1 kHz to 704 850 MHz in steps of 1 kHz Min Abbr clock stp u clock stp d Arguments v lt NR3 gt in the range 0 001E 6 to 704 850E 6 Example clock_step_up 0 100E 6 clock_step_dn 0 100E 6 GB700 User Manual 8 35 Remote Commands clock term gnd neg 2V External Clock Termination Sets the termination of the External Clock input to either 50 ohms to ground or 50 ohms to 2 0 volts Min Abbr clock t Arguments gnd 50 ohms to ground neg 2V 50 ohms to 2 00 volts Example clock term gnd clock term External Clock Termination Query Returns a character string indicating the current termination setup of the Generator s external clock input Min Abbr clock t
22. 2 for a quick overview of each control in the PATTERN section Pattern Definitions The gigaBERT700 can generate and analyze three types of test patterns Pseudo random bit sequence PRBS mark density and word Each type has its own set of advantages and uses PRBS Patterns Pseudo random bit sequence PRBS patterns are designed to simulate live traffic and have been standardized by the telecommunications and computer industries As a result they are often used to characterize or qualify new devices or systems Two key characteristics of a PRBS are its overall length in bits and maximum number of contiguous Os The length of a PRBS pattern has the form 29 1 For example a 223 1 PRBS contains 8 388 607 bits The maximum number of contiguous 0s in a PRBS pattern is n 1 for example 22 in a 223 1 PRBS The PRBS patterns generated and analyzed by the gigaBERT700 are listed in Table 3 2 Table 3 2 PRBS 21 1 Test Patterns N Label Used in Generator and Length Maximum Number Analyzer Displays 29 1 bits of Contiguous Os PN 15 32767 PN 17 131 071 PN 20 1048575 PN 23 8388607 GB700 User Manual 3 7 Common Functions Mark Density Patterns Option The average ones or mark density of a PRBS pattern is almost exactly 50 That is the number of 1s equals the number of Os plus one However the gigaBERT700can also generate and analyze a set of mark density patterns with average mark densities from 1 8 12 5 to 7 8 87 5
23. 9 E 04 9 7E 04 4 8 E 04 2 4 E 04 1 2 E 04 6 1 E 05 3 0 E 05 OBONANIEWNH GB700 User Manual 6 15 Menu Functions Test Length LENGTH Format F1 ESC F2 gt F3 F4 SET TEST LENGTH hh mm ss Menu TEST Function Name LENGTH Instruments Analyzer only Options None required This is a standard feature Application Use this function to set the duration of timed tests and the repeat interval of repeat timed tests Parameters Hours hh Set from 00 to 23 Minutes mm Set from 00 to 59 Seconds ss Set from 00 to 59 Notes Test length does not affect untimed TEST intervals or the TOTALIZE or WINDOW measurement processes 6 16 GB700 User Manual Menu Functions Test Mode MODE Format F1 ESC FA SET TEST MODE ccccccc Menu TEST Function Name MODE Instruments Analyzer only Options None required This is a standard feature Application Use this function to select a test timing mode Parameters Test Timing Mode ccccccc May be set to TIMED REPEAT or UNTIMED Notes This function applies only to the TEST measurement process and has no impact on either the TOTALIZE or WINDOW measurement processes GB700 User Manual 6 17 Menu Functions Test Reports REPORT Format F1 ESC F4 SET REPORTS ON ccccccccc Menu TEST Function Name REPORT Instruments Analyzer only Options None required This is a standard feature Application Use this function to enable or disable E
24. Analyzer and Generator Options Requires the 128K Option Application Use this function to set the byte location of the pattern synchronization pulse in long word patterns Parameters Pattern Sync Pulse Byte Location ddddd Set this parameter to the number in decimal of the byte in which you want the pattern sync pulse to occur Notes 1 The PSYNC output is in the OUTPUT section of the Generator and the MONITOR section of the Analyzer 2 The PSYNC parameter does not affect the location of the PSYNC pulse for PRBS or short word patterns GB700 User Manual Menu Functions Word Synchronization Threshold SYNC Format F1 ESC F4 SET WORD SYNC THRES LEVEL d Menu WORD Function Name SYNC Instruments Analyzer only Options Requires the 128K Option Application This function is used to set the BER synchronization threshold used by the Analyzer for long word patterns This function does not affect the sync thresholds for PRBS or short word patterns which are fixed Parameters Long Word Synchronization Threshold Level d Set this parameter to a level from 1 to 9 Notes The long word synchronization threshold is always set to 256 errors in a rolling window of variable length The length of this window is automatically set by the Analyzer based on the selected threshold level so that the nine threshold levels effectively correspond to the following bit error rates Level BER 3 1 E 02 7 8 E 03 1
25. Causes the instrument to perform a self test and return the result A result of 0 means the self test was successful A return of any other value means the self test was not successful The gigaBERT700 self test is limited in scope Min Abbr tst Returns 0 if successful Example tst command 0 indicates successful self test wal Wait This command forces the instrument to stop processing any additional commands until all pending operations are completed Min Abbr wal tse v Analyzer Only Test Status Enable This command sets the Test Status Enable Register to the bit sequence corresponding to v where v is a decimal number in the range 0 to 255 Min Abbr tse Argument n NRI in the range 0 to 255 Example tse 255 sets the TSR to 11111111 binary tse Analyzer Only Test Status Enable Register Query This command returns a decimal number representing the current contents of the Test Status Enable Register TSER Min Abbr tse Returns NRI in the range 0 to 255 Example tse command TSE 255 response GB700 User Manual 8 17 Remote Commands tsr Analyzer Only Test Status Register Query This command returns a decimal number representing the current contents of the Test Status Register TSR Min Abbr tsr Returns lt NR1 gt in the range 0 to 255 Example tsr command TSR 224 response 8 18 GB700 User Manual Remote Commands Commands Shared by the Generator
26. Controllers Table 7 6 Status Registers Enable Registers Related GPIB Commands Status Register Status Register Enable Register Enable Register Query Commands Commands se 9m Standard Event Status ESR Event Status Enable ESE ESE Register SESR Register ESER Test Status TSR Test Status Enable TSE Register TSR Register TSER Status Byte STB Service Request Enable SRE SRE Register SBR Register SRER V NOTE Use the CLS command to clear reset the SESR and return the instrument to the Operation Complete Command Idle State and the Operation Complete Query Idle State In this state the instrument has no data in its input or output buffers and is not executing a command V NOTE The ESR and TSR query commands also clear reset the SESR and TSR status registers respectively Standard Event Status Register The Standard Event Status Register SESR is a status register that indicates errors in command syntax and related occurrences The name of each bit in the SESR is shown in Figure 7 1 The function of each bit in the SESR is defined in Table 7 7 Figure 7 1 Standard Event Status Register SESR GB700 User Manual 7 15 Using Printers and External Controllers Table 7 7 SESR Bit Definitions m m PON Power On Set to one when the instrument is first powered on URQ User Request Not used CME Command Error Set to one when a command header mnemonic has been esa that is not reco
27. EOI or EOI LF 4 The selected GPIB terminator will be in effect when you press F4 to exit the GPIB function 5 Press F1 until you have exited the menu system You cannot change the GPIB terminator via the GPIB port However you can change the GPIB terminator remotely via the RS 232C port Returning the Instrument to Local Mode Most GPIB controllers can put instruments on their bus into a remote mode in which all front panel setup controls except the GPIB LOCAL key are disabled The LED in the GPIB LOCAL key on the Generator or Analyzer front panel indicates whether the instrument is in the local mode LED off or remote mode LED on Ifthe LED is on you can press the LOCAL key to return the instrument to the local mode Procedure to Return the Instrument to the Local Mode Q Ifthe LED in the LOCAL key is on you can return the instrument to the local mode by pressing the LOCAL key At this point the LED will turn off indicating that all front panel controls are again active Note that there is no way for you to put the instrument into the GPIB remote mode from the front panel or using menus However you can lock and unlock the front panel using the PANEL LOCK key which offers the same functionality GB700 User Manual Using Printers and External Controllers GPIB Interface Functions The gigaBEHT700 is configured as a GPIB talker listener It does not provide any controller functions Table 7 4 lists the GPIB functions
28. EXCEPT FOR MANUFACTURE BY VENDORS FOR TEKTRONIX AND FOR MANUFACTURE UNDER THE CORPORATION S WRITTEN LICENSE NO RIGHT TO REPRODUCE THE DOCUMENT IS GRANTED UNLESS BY WRITTEN AGREEMENT WITH OR WRITTEN PERMISSION FROM THE CORPORATION Performance Verification The following tests verify that the gigaBERT700 Generator amp Analyzer achieve their specified performance These instruments are not user adjustable If the gigaBERT700 needs repair return it to Tektronix Recommended Test Equipment The recommended test equipment needed to verify performance is listed below gigaBERT700 Generator gigaBERT700 Analyzer Coaxial SMA cables equal length Standard Instrument six each 50 ohm 75 ohm option four each 75 ohm two each 50 ohm GB700 User Manual D 1 Customer Acceptance Test Functional Test To functionally test the gigaBERT700 connect the Generator to the Analyzer and confirm their correct Operation as described below Note In these procedures the Generator and Analyzer are returned to their default settings The word memories will be reset If you have entered word patterns that you do not want to lose use a GPIB or RS 232C controller to save them before beginning these procedures Q Step 1 Make connections appropriate to the options installed as follows Connections for Functional Test Option From To Comment Standard Instrument TX Data RX Data 50 ohm SMA coax 75 ohm Option TX Not Clock RX Not Clock 75 ohm SMA coax
29. Edit End You must issue this command to finish a 128K word editing session This command either moves the edited pattern from scratchpad memory to the current word location or saves the edited pattern into one of the instruments eight word memory locations You can also use this command to discard the edit pattern Min Abbr edit_e Arguments n lt NR1 gt a decimal number in the range 2 to 7 where 2 discards the edited pattern 1 copies the edited pattern to the current word location and 0 through 7 saves the edited pattern to the indicated memory location Example edit_end 1 psync a Pattern Synchronization This command is used to set the location of the pattern synchronization pulse generated by the PSYNC output to a given byte location a in the active word pattern Min Abbr ps Arguments a lt NR1 gt in the range 0 to 16383 Example psync 0 psync Pattern Synchronization Query Returns the current byte location of the psync pulse Min Abbr ps Returns lt NR1 gt 8 92 GB700 User Manual GB700 User Manual Example psync PSYNC 0 Remote Commands Remote Commands recall mark m1_8 m1_4 m1_21m3_4 m7_8 Recall Mark Density Pattern This command recalls a selected mark pulse density pattern from PROM and makes it the current word and the active pattern Min Abbr recall mark Arguments M1 8 1 8 12 5 mark density pattern M1 4 1 4 25 mark density pattern M1 2 1 2 50 mark density patter
30. Feature Overview may be used to terminate singled ended clock and data outputs respectively CLOCK BAR and DATA BAR inputs These are complimentary inputs to CLOCK and DATA That is CLOCK and CLOCK BAR together comprise a differential clock input while DATA and DATA BAR together comprise a differential data input When the Analyzer is connected to singled ended clock and data signals these inputs are not used REF DATA input This is an input for a reference data signal When the external reference mode is selected LED in EXT key is on the signal appearing at the REF DATA input will be used as the reference signal to perform bit error analysis instead of a reference pattern generated by the Analyzer s error detection circuit Note that REF DATA uses the same clock signal as DATA however different amounts of delay can be added to the DATA and REF DATA inputs to account for phase differences between the two signals Analyzer MONITOR Section The MONITOR section of the Analyzer front panel contains the auxiliary outputs shown below These outputs may be used to monitor the test signal as seen by the Analyzer For more information and related setup instructions see Chapter 4 a a a CLOCK output A buffered copy of the clock signal received by the Analyzer DATA output A regenerated re clocked version of the data signal received by the Analyzer PATTERN SYNC outputl A train of pulses that occur once per pat
31. Menu Descriptions Found In Which Description Instrument Analyzer and Provides access to all other menus Also contains a Generator few functions not part of any other menu Analyzer only Contains functions to set up the TEST measurement process including timing mode End of Test reports and the test threshold WINDOW Analyzer only Contains functions to set up the WINDOW measurement process including window length and End of Window reports Analyzer and Contains functions to create and edit word patterns Generator Analyzer and Contains functions to set up the RS 232C serial port Generator PRINT Analyzer only Contains functions to select which port is used to print reports and to enable or disable all report printing UTIL Analyzer and Contains functions to show which options are installed Generator and the current software version 6 6 GB700 User Manual Table 6 2 Analyzer Menu System Overview to Normal mode MORE MORE ESC to MAIN Menu ESC to MAIN Menu MORE ESC to MAIN Menu MORE ESC to MAIN Menu LENGTH THRES VIEW CUR REPORT EDIT SYNC BAUD EOL Menu Functions WINDOW GPIB TIME REPORT PRINT VIEW PRE SECOND LENGTH ORDER PARITY XON XOFF 1 ESC PORT ON OFF to MAIN Menu 1 ESC OPTION VER to MAIN Menu 1 Menu names appear in bold typeface 2 Functions included only in instruments equipped with the 128K Option are marked with an asterisk
32. Min Abbr win p Returns current previous 8 76 GB700 User Manual Remote Commands Example win_prev command WIN_PREV CURRENT response win_rate Window Rate Query Returns the BER measured in either the current window interval so far or the previous window interval depending on the setup of WIN_PREV Min Abbr win_ra Returns lt NR3 gt Example win report on off Windows Report This command enables or disables End of Window reports Min Abbr win re Arguments on enables End of Window reports off disables End of Window reports Example win report on win report Windows Report Query Returns a character string indicating whether End of Windows reports are enabled on or disabled off Min Abbr win re Returns on off Example win report command WIN REPORT ON response win sec len s Windows Seconds Length Sets the windows seconds length parameter to the duration indicated by the quoted string s Min Abbr win S Arguments S lt qstring gt in format hh mm ss where hh hours 00 to 23 mm minutes 00 to 59 and ss seconds 00 to 59 GB700 User Manual 8 77 Remote Commands Example win_sec_len 00 30 00 win_sec_len Windows Seconds Length Query Returns a quoted string indicating the value of the windows seconds length parameter Min Abbr win s Returns lt qstring gt Example win_sec_len command WIN_SEC_LEN 00 30 00 response win_time
33. Mode FREQUENCY MHz ERROR RATE NUMBER OF ERRORS ON soe PATTERN THRESHOLD The function of each field in the normal Generator display format that is the format used when the Generator is not in the menu mode is described below QO The top left section of the Generator display is used to show the current frequency of the internal clock in MHz For example a display of 622 050 indicates a frequency of 622 050 MHz Q The top middle section normally shows the current test pattern For example PN23 INV indicates that the current pattern is an inverted 223 1 PRBS C The top right section of the display shows the amplitude of the CLOCK or DATA output depending on which output control CLOCK or DATA is selected C The bottom left section of the Generator display may show either the presently selected word memory WORD 0 WORD 7 or the selected frequency memory FREQ 0 FREQ 9 C The bottom middle section of the display shows the present error inject mode If an internal error inject mode has been selected then the generated error rate will be indicated GB700 User Manual 2 7 BERT Basics and Feature Overview CL The bottom right section of the Generator display will normally show the baseline offset of the CLOCK or DATA output depending on which output control CLOCK or DATA is selected Analyzer Display Like the Generator the Analyzer has a two line by 24 character high contrast liquid crystal displa
34. Options Application Parameters Notes 6 38 F1 ESC F2 gt F3 F4 SET DATE mmm dd yy Selected from main menu DATE Analyzer only None required This is a standard feature Use to set the Analyzer s internal date function Month mmm Set in range JAN FEB DEC Day dd Set in range 01 02 31 Year yy Set in range 93 99 End of Test reports are date and time stamped GB700 User Manual Menu Functions Time TIME Format F1 ESC F2 gt F3 F4 SET TIME hh mm ss Menu Selected from main menu Function Name TIME Instruments Analyzer only Options None required This is a standard feature Application Use this function to set the instrument s 24 hour internal clock Parameters Hours hh Set in range 00 23 Minutes mm Set in range 00 59 Seconds ss Set in range 00 59 Notes The Analyzer clock uses a 24 hour format GB700 User Manual 6 39 Menu Functions 6 40 GB700 User Manual Using Printers and External Controllers This chapter explains how to use a printer with the gigaBERT700 Analyzer and how to remotely control the Generator and Analyzer via their RS 232C or GPIB ports This chapter also includes setup procedures for the RS 232C and GPIB ports GB700 User Manual 7 1 Using Printers and External Controllers Remote Control Basics Operation of a gigaBERT700 Generator or Analyzer can be automated by connecting an external control
35. Returning Current or Previous Test Results on page 8 44 Min Abbr res_us Returns lt NR1 gt Example res_us command RES_US 120 response res_us_per Results Unavailable Seconds Percentage This command returns the percentage of unavailable seconds either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_us_ Returns lt NR2 gt Example res_us_per command RES_US_PER 29 01 response total_bits Totalize Bits Query Returns the number of bits accumulated in the current Totalize measurement interval The Totalize bit count is zeroed at the start of each new Totalize measurement interval that is at power up and after each error reset Min Abbr total_b Returns lt NR1 gt Example total_bits command TOTAL_BITS 32365018072 response 8 52 GB700 User Manual total_error Remote Commands Totalize Error Query Returns the number of bit errors counted so far in the current Totalize measurement interval The Totalize error count is zeroed at the start of each new Totalize measurement interval that is at power up and after a error reset Min Abbr Returns Example total_rate total_e lt NR1 gt total_error command TOTAL_ERROR 20984 response Totalize Bit Error Rate Query Returns the bit error rate BER calculated so
36. Returns gnd neg 2V Example clock term command CLOCK TERM GND response recall freq m Recall Frequency This command recalls a previously saved frequency from memory location m The recalled frequency becomes the current frequency of the Generator internal clock Min Abbr recall f Arguments m lt NR1 gt in the range 0 1 9 Example recall freq 5 save freq m Save Frequency This command saves the current Generator internal clock frequency to memory location m Min Abbr save f Arguments m lt NR1 gt in the range 0 1 9 Example save freq 8 8 36 GB700 User Manual Remote Commands Output Clock and Data Setup Commands amplitude v Amplitude This command sets both Data and Clock amplitudes to the same voltage v Min Abbr am Arguments v lt NR2 gt in the range 0 50 to 2 00 in steps of 0 05 Example amplitude 1 50 amplitude Amplitude Query Returns two message units the first indicating the clock amplitude setting and the second indicating the data amplitude setting Min Abbr am Returns lt NR2 gt lt NR2 gt Example amplitude command CLOCK_AMPL 1 450 DATA_AMPL 1 450 response clock_amp_up and clock_amp_dn Clock Amplitude Up Down Default This command pair is used to increment or decrement the current clock amplitude setting by the default increment of 0 05 volts Min Abbr clock_amp_u clock_amp_d Arguments none Example clock_amp_up cloc
37. UA calibration values C stored frequencies or Q stored words The returned string will consist of a series of commands headers plus parameters These commands may be stored by the controller and used to restore the instrument to the same setup at a later time Min Abbr Irn Example Irn command AUDIO_RATE 4 response AUDIO_VOL 0 AUTO_SEARCH AUTO BYTE_LENGTH 8 0 WIN SEC LEN 00 00 11 WORD ORDER MSB Operation Complete This command will cause the OPC bit in the Status Byte Register to be set to one If the OPC bit is enabled this will result in an SRQ Thus the ope command can be issued after a group of setup commands to determine when all of the setup commands have been executed Min Abbr opc Example opc opc Operation Complete Query This query command will cause the instrument to return the ASCII character for 1 when all previous commands and queries have been completed Thus the opc command may be used to determine when the instrument has completed a group of commands Min Abbr opc GB700 User Manual Remote Commands Example opc command rst 1 response Reset This command causes the instrument to return to its factory default settings and to enter a known operation state Specifically rst does the following a a a puts the instrument into the Operation Complete Command Idle State puts the instrument into the Operation Complete Query Idle State r
38. address within the current word in decimal and HH is the value of the 3 13 Common Functions selected byte in hexadecimal Byte address will be in the range 0 1 16383 3 14 GB700 User Manual Common Functions 3 If you need to change word length press the WORD LENGTH key and then the pattern up down keys Pattern lengths of 2048 bytes or less will be displayed in terms of M bytes plus N bits Pattern lengths above 2048 bytes will be displayed in terms of bytes only When the desired word length is displayed press the WORD key to return to the word editing mode 4 To select a byte within the current pattern use the pattern up down keys to increment or decrement the displayed byte address 5 To edit the selected byte press the 1 MSB through 8 LSB bit keys to toggle individual bits Note that the LED in each bit key indicates whether the associated bit equals 0 LED off or 1 LED on Repeat steps 4 and 5 until the word has been edited as required You have now created a new word pattern and may use it to perform tests The current pattern is automatically stored in battery backed memory However if the new pattern is important be sure to save it before creating or RECALLing another pattern Creating Word Patterns Using Menus The menu functions used to create or edit word patterns are OQ LENGTH Q FILL A EDIT and C ORDER These functions are located in the WORD menu Note that ORDER is a standard fun
39. all device settings to their last powered settings in other words to their value when the instrument was last powered off No remote commands will affect this power on rule However if the instrument detects a problem in non volatile battery backed RAM at power up then factory default settings Appendix B will be restored rather than the last powered settings A RAM problem at power up will be indicated in the LCD display by the message RAM Corruption Message Exchange The gigaBERT700 implements GPIB message exchange as follows 1 The input buffer is command line oriented A new buffer is provided for each new command line 2 Each command line may contain a maximum of 80 characters 3 The only gigaBERT700 commands that can return more than one message unit are listed in Table 7 5 below Table 7 5 Commands That Generate Multi Unit Responses wor Fro 4 Command responses are generated immediately after they are parsed In other words the gigaBERT700 will not wait for a read command before generating a response to a query command 7 10 GB700 User Manual Using Printers and External Controllers 5 No commands are coupled Functional Elements All functional elements in Tables 4 2 and 4 3 of ANSI IEEE Std 488 2 1987 that are used in gigaBERT700 commands are listed below 1 fo 0 n9 9 m c m Rh hp Bono PROGRAM MESSAGE PROGRAM MESSAGE TERMINATOR PROGRAM MESSAGE UNIT PROGR
40. an end of line terminator This character or pair of characters will be added to the end of every line in reports sent to the RS 232 port Parameters End of Line Terminator ccccc May be set to CR LF LF CR CR or LF GB700 User Manual 6 31 Menu Functions RS 232 Xon Xoff XON XOFF Format F1 ESC F4 SET XON XOFF ENABLE ccc Menu RS 232 Function Name XON XOFF Instruments Analyzer and Generator Options None required This is a standard feature Application Use this function to enable or disable Xon Xoff flow control Parameters Xon Xoff Flow Control ccc May be set to ON enabled or OFF disabled 6 32 GB700 User Manual Menu Functions RS 232 Echo ECHO Format F1 ESC F4 SET RS232 ECHO ENABLE ccc Menu RS232 Function Name ECHO Instruments Analyzer and Generator Options None required This is a standard feature Application Use this function to enable or disable character echo on the RS 232 port When enabled the instrument will echo that is transmit back to the controller each character that it receives on the RS 232 port Parameters RS 232 Echo Enable ccc May be set to ON or OFF GB700 User Manual 6 33 Menu Functions GPIB Format Menu Function Name Instruments Options Application Parameters 6 34 F1 ESC F4 SET TERMINATOR cccccc Selected from main menu GPIB Analyzer and Generator None required This is a standard fe
41. and CLOCK threshold and DATA input delay and threshold as follows Procedure 1 Set up the Generator to transmit a PRBS pattern 2 Enable Analyzer AUTO SEARCH as follows OU EXT ref data input control off U SYNC DISABLE off AUTO SEARCH on 3 After the Analyzer LOCK LED turns on disable AUTO SEARCH by pressing the AUTO SEARCH key Verify that the LED in the AUTO SEARCH key turns off 4 Change the pattern setup of the Generator and Analyzer as desired For example to perform a test using a word pattern stored in GB700 User Manual Analyzer Functions memory press the Analyzer pattern RECALL key and up down keys to select the word pattern Repeat these steps on the Generator to select the same word pattern At this point the SYNC LOCK LED should turn on again indicating that the Analyzer has regained synchronization You may now start a new test interval by clearing previous results PRESS ERROR DETECTION CLEAR key and history indicators PRESS HISTORY CLEAR key How to DISABLE Automatic Pattern Resynchronization The pattern resynchronization disable feature is turned on or off as follows Procedure C Press the DISABLE key to toggle automatic pattern resynchronization on or off When the DISABLE LED is on pattern resynchronization is disabled When the DISABLE LED is off pattern resynchronization is enabled Relationship between AUTO SEARCH and DISABLE Turning AUTO SEARCH on automatically turns DISAB
42. command TEST REPORT BOTH response test squelch on off Test Squelch Enables or disables squelching of On Error reports Min Abbr test_sq Arguments on On Error reports will be squelched after 10 consecutive reports that is 10 consecutive seconds in which BER is above the Test Error Rate threshold On Error reports will then be automatically unsquelched after five consecutive seconds in which BER is not above the Test Error Rate threshold off On Error report squelching is disabled Example test_squelch on test_squelch Test Squelch Query Returns a character string indicating the current setup of the test squelch parameter Min Abbr test_sq Returns on off Example test_squelch command TEST_SQUELCH ON response 8 72 GB700 User Manual Remote Commands test state run I stop Test State This command is used to start or stop the test measurement process Min Abbr test_st Arguments run starts the test measurement process Will initiate an untimed timed or repeat test depending on the setup of test mode stop Stops the test measurement process Will terminate untimed or repeat tests Will also prematurely end timed tests before test length has elapsed Example test_state run test_state Test State Query Returns a character string indicating the current state of the test process A response of RUN indicates that a test is in progress A response of STOP indicates that
43. conductor and ground Ground the Instrument The gigaBEHT 700 is grounded through its AC power cord Plug this power cord only into a properly grounded three conductor outlet If you operate the instrument without a proper ground then all metal surfaces on the instrument become potential shock hazards To avoid potential hazards use this product only as specified Use the Proper Fuse Operating the instrument with an improper fuse creates a fire hazard The correct fuses to install in the gigaBEHT 700 are shown below Power Voltage Fuse Type 115 VAC 2 A Slo Blo 230 VAC 1 A Time Delay Do Not Operate in Explosive Atmospheres This instrument does not provide protection from static discharges or arcing components and therefore must not be operated in an explosive atmosphere Do Not Remove Instrument Covers To avoid a shock hazard and to maintain proper air flow never operate the gigaBEHT 700 with any of its outside covers removed xii GB700 User Manual Table of Contents Static Sensitive Device Notice gigaBERT700 outputs use a GaAs FET design and therefore are susceptible to damage from externally applied over voltage or electrostatic discharge Never apply reverse voltage to DATA or CLOCK outputs or voltages that are outside the range specified in Appendix A of this manual Operate the instrument only in a static controlled environment SMA Connectors Be careful when attaching test cables to SMA connectors Always tighten the n
44. controls 1 Turn instrument power off 2 While holding down the VIEW ANGLE MSB 1 and PATTERN CLEAR keys simultaneously turn instrument power back on 3 After you see the message Default Settings appear in the display release the three keys In a few seconds the normal display format will appear and the instrument will be in its default setup Via Remote Control To return the Generator or Analyzer to its factory default settings via remote control issue the rst command Note that this command also returns the instrument to the Operation Complete Command Idle State and the Operation Complete Query Idle State B 2 GB700 User Manual Default Settings Functions Shared by Generator and Analyzer Data Pattern Standard Current PRBS pattern eene PN 7 27 1 Current word length 1 se 16 bits Current word pattelD ooocccnoccccnoccnonocnnononnninonaninnnnss AA 55 Word memories 0 through 7 same as current word Active DATO an PRBS Data Inv ert os ceo Dota e ERN EATEN off AA dV Dec qd nA IU cae LSB first Data Pattern 128K Option Current word length s 8 bytes Current word pattern eese AA55A55AAA55A55A Word memories 0 through 7 same as current word Pattern Sync pulse oso ase tote eritis 0 Synchronization threshold Analyzer only 1 Remote Interfa
45. counted either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_es Returns lt NR1 gt Example res_es command RES_ES 384 response res_es_per Results Error Free Seconds Percentage This command returns the percentage of errored seconds calculated either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_es_ Returns lt NR2 gt Example res_es_per command RES_ES_PER 89 35 response res_los Results Loss of Signal Seconds This command returns the number of seconds counted that contained a loss of signal event either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res Returns lt NR1 gt Example res_los command RES_LOS 1 response 8 48 GB700 User Manual Remote Commands res_pha_es Results Phase Errored Seconds This command returns the number of phase errored seconds counted either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current te
46. ee eae ee 8 65 Inscty clear A rin Gera ba Ao ea 8 65 lustry DAA Uae oan AMD n 8 66 HiStry DOWEL rato 8 66 histry SH saaedeodten ii 8 66 MISTER ita 8 67 O a 8 31 offset V rae eei N E E A ae E EES 8 41 OI E e Soto atu E EEE 8 42 OPON S gee eee are nee Mere my tio 8 32 prbs Iensch Ivl ue itte beret e een Gash eria 8 20 A oerte Reiten da ouv ted qid 8 20 print enable Lonloff ase aia 8 79 print enable 4 oec opt pto phim Rp ditata 8 79 print port parallel gpib serial o ooooononocononacononanonnnos 8 79 DEI port oia 8 80 prnt sirmg 8 ascia li ee toe ROUTE Erie oi 8 80 psysie cH Peter errr ole om EE LES 8 92 E ufue 8 92 rdata del up and rdata del dn sues 8 60 rdata del up v and rdata del dn v 8 60 ata dela d eet Hm Pone i 8 61 Pata AN RR Spi men DIR NIU 8 61 rdata term neg 2v gnd ac pos 3v 8 61 rdata tePmi osea oA ue i ON AER cu RI EIE 8 61 rdata thr up and rdata thr dn 8 62 rdata thr up v and rdata thr dn v 8 62 GB700 User Manual 8 9 Remote Commands Mata tires an 8 62 Tata fes Go cese Render E e PIN up 8 63 recall freq la ut on tte roodo ep tia ar OUR 8 36 recall mark m1 81m1 4l m1 21 m3 4lm7 8 8 93 recall pront Bb oue oon iD 8 93 recall word m acces a 8 21 pes DUIS eod oet eR eame Gen ss eie dan 8 45 POS cur bab
47. error rate test system or BERT A BERT is an instrument designed to measure the bit error rate BER or more generally the error performance of a digital communications device module or system A typical BERT application for example would be to measure the error performance of the electrical to optical E O and optical to electrical O E output modules of a high speed fiber optic transmission system FOTS as shown in Figure 2 1 Figure 2 1 Example BERT Application gigaB ERT 700 Generator gigaBERT 700 Analyzer CLOCK DATA CLOCK DATA The gigaBERT700 is described as a serial BERT because it is designed to test one digital path at atime The term serial also distinguishes the gigaBERT700 from parallel BERTs such as the Tektronix multiBERT 100 which is designed to test multiple digital signal paths simultaneously The gigaBERT700 Generator also known as the transmitter or Tx can generate various test patterns including pseudo random bit sequences PRBS and user defined word patterns The Generator output consists of a two level non return to zero NRZ data signal and its associated clock signal as illustrated in Figure 2 2 In the NRZ format the data signal remains at either a logic 1 or logic 0 level for the entire duration of each bit time slot except for a small transition period between time slots containing different data The corresponding clock signal is a nominal square wave whose frequency defines the bit
48. is a 25 pin female D type connector located on the rear panel The pin out of this connector is shown in Table 7 2 Note that the gigaBERT700 RS 232C port is set up as a DCE data communications equipment device that is it receives on pin 2 and transmits on pin 3 Table 7 2 RS 232C Connector Pin out eno memsamm 0 uu Received Data Input Data is received by the gigaBEHT 700 on this pin ul Data Output Data is transmitted by ul on this pin Clear To Send A high level or open applied to this pin indicates to the gigaBERT 700 that the controller or terminal is ready to receive data A low level indicates that the controller or terminal is not ready The gigaBEHT 700 pulls this pin high internally with 27 kohms to 12V 5 Request to Send The gigaBERT 700 always sets this pin high re Data Terminal Ready The gigaBEHT 700 always sets this pin high 20 Data Set Ready This input is ignored Cables Use a straight through normal cable when connecting the gigaBERT700 to a DTE data terminal equipment device or a null modem cable when connecting to another DCE device 7 4 GB700 User Manual Using Printers and External Controllers Quick Test of the RS 232C Port You can perform a quick test of the Analyzer or Generator RS 232C port using a terminal or a PC running terminal emulation software as follows 1 De power the instrument 2 Attach the appropriate 25 pin cable from the instrument s RS 232C port
49. menu contains the following six selections C LENGTH Test length hours minutes seconds MODE Test timing mode Timed Untimed or Repeat REPORT Test reporting mode None Print On Error or Both THRESH Threshold for the TES threshold errored second result SQUEL On Error report squelch after 10 consecutive seconds yes or no a a a a C PRINT Use this function to print current Test results immediately If you want to collect TEST results you must set LENGTH and MODE before you begin a test And if you are using a printer you should set the REPORT parameter as desired Note that On Error reports can generate a lot of paper so select On Error or Both with caution Setup of the other parameters in the TEST menu are optional 5 20 GB700 User Manual Analyzer Functions Procedure 1 Press F1 to access the menu system 2 Select the TEST menu F2 3 Within the TEST menu set up a LENGTH F2 and b MODE F3 4 And if you are using a printer set up the REPORT parameter F4 5 Press MORE F1 to see the next page of the TEST menu Review the setup of the THRES F2 and SQUEL F3 parameters Change if necessary M NOTE Setting SQUEL squelch to ON is recommended 5 Press the F1 key multiple times to exit the menu system See Chapter 5 for more information of setting up the TEST menu GB700 User Manual 5 21 Analyzer Functions Viewing Results BER and bit error results are shown in the
50. minutes 0 to 59 ss seconds 0 to 59 Example test_length 02 00 00 test_length Test Length Query Returns the current value of the timed test length parameter Min Abbr test_1 Returns lt qstring gt in format hh mm ss Example test_length command TEST_LENGTH 02 00 00 response GB700 User Manual 8 69 Remote Commands test mode untimed timed repeat Test Mode Sets the test timing mode Min Abbr Arguments Example test mode Test Mode Query Min Abbr Returns Example test m untimed after test start a test interval will continue until a test stop command is received or the test is stopped manually from the front panel timed after a test start a test interval will stop automatically after test length has elapsed repeat after test start a test interval will stop and then restart automatically after test length has elapsed This process will continue until a test stop command is received or testing is stopped manually from the front panel test mode timed Returns the current Analyzer test timing mode test m untimed timed repeat test mode TEST MODE TIMED test prev current previous Test Previous Sets test prev parameter to current or previous This parameter determines whether responses to results query commands will be based on the current interval or the previous interval See note on NOTE Returning Current or Previous Test Results p
51. mode SINGLE When the error inject function is set to single ERR OFF press this key to inject single errors Or when the error inject function is set to an internal rate or to external use this key to turn error injection off Note that you could then press the RATE key to turn error injection back on at the same rate as before Error Inject LED The LED in the ERROR INJECT section will flash once for each injected error Analyzer INPUT Section The controls shown below are used to set up the Analyzer clock and data inputs See Chapter 4 for Analyzer input setup procedures a GB700 User Manual DELAY Press this key to add delay to the DATA or REF DATA inputs to adjust the clock data phase relationship Note that the Auto_Search function will automatically set data delay to a value which provides the maximum noise immunity that is so that the active falling edge of the clock falls in the middle of data bit time slots 2 19 BERT Basics and Feature Overview a a a THRESH Press this key to set the input decision threshold for the DATA CLOCK and REF DATA inputs Note that threshold does not apply when differential operation is selected TERM Press this key to select the input terminations for the DATA CLOCK or REF DATA inputs Available selections are GND 2 V 3 V or AC DIFF Press this key to toggle the data or clock input between single ended LED off or differential operation LED on INVE
52. n 8 72 test SquelcH sop doo dan 8 72 test state Irun SCO eer ii a eaS 8 73 A ertet erp cree uar PSU ee tasp ficia Is 8 73 16st Dhres li desa 8 73 PORE A din E IR melon ice medina iu ota pico dius 8 74 meli ERRORI a ias 8 84 DH eso A Gene a e aa ES 8 85 total BIDS cotone a 8 52 o pea D Dm Oei ue ats 8 53 total pato cenobio dia S E UN tia 8 53 A Ee O i an e 8 53 tse v Analyzer Only 5u ose e E DR eee 8 17 tse Analyzer Online cos 8 17 ter CAnalyzer Only cn eee Hees anaes 8 18 tt120 reset and ttl20_error ooooocccnnocucconononnnononnnnnononananonocana nacos 8 67 VIEW ANGIE LV iu a s are Soares ese aaa anaes oes 8 32 Vew A eun Rope ern astu aa Da or sumat 8 32 win Dit lenovo oe eet vate uid te pe eres co e rdiet 8 75 wina iM Tm 8 75 A A ue te AE E D D tue 8 75 WIN OLN OT eos eere tree eee ee a eese e eee eet 8 75 win mode bits 866 iia 8 76 Xt Tode sou etae ded vas cv Puede i Eo eee o IN Eve pu eU Te Sdn edet 8 76 win prev current previous eese 8 76 WIN prev inlA PT 8 76 A MEINE IEEE 8 77 WAIT SNe POPE On OFT cose er S et ER Se Avo HERMES DI RIEN 8 77 A ber wun be n 8 77 win BOC AA eau vacsiansoce T 8 77 win sec A E a ee Eee Eres 8 78 a EAE ee one ee ne 8 78 word bits Pe b BT M balas nia tes rre ds 8 21 Word A II IN bru S 8 22 word length Mela dial 8 22 word mem len m le eene 8 22 word mem ord m msb 1sb o oonnnnnnnnnnnnnnnnnininnnanananinin
53. no test is in progress Min Abbr test_st Returns run stop Example test_state command TEST_STATE RUN response test_thres v Test Threshold Used to set the test error rate threshold to the value 1 x 10 V This threshold determines which seconds are counted as Threshold Errored Seconds TES It also determines when On Error reports are generated Min Abbr test_t Arguments V lt NR1 gt in the range 2 3 16 That is the test error rate threshold may be set in the range 10 2 to 10 16 Example test_thres 12 GB700 User Manual 8 73 Remote Commands test_thres Test Threshold Query Returns the value v indicating that the current test error rate threshold is set to 1 x 107V Min Abbr test_t Returns lt NR1 gt Example test_thres command TEST_THRES 12 response indicating that the test error rate threshold is set to 1 x 10 12 8 74 GB700 User Manual Remote Commands WINDOW Setup Commands win_bit_len v Windows Bit Length Sets windows bit length parameter to 1 x 10V bits This parameter determines window length when WIN_MODE is set to BITS Min Abbr win_bit_ Arguments V lt NR1 gt in the range 8 9 16 Example win bit len 15 win bit len Windows Bit Length Query Returns the value v indicating that the windows bit length parameter is set to 1 x 10V bits Min Abbr win bit Returns lt NR1 gt Example win_bit_len command WIN_BIT_LEN 15 response win
54. normal display mode However to view the complete list of Test results you must use the TEST menu VIEW CUR or VIEW PRE functions BER and Bit Errors The Analyzer calculates BER and bit errors using all three measurement methods Totalize Window and Test The current display mode determines which BER bit error result pair is shown in the display Note that BER is shown in the top middle field while the bit error result is shown in the top right field Procedure to View Desired BER and Bit Error Results C Press the DISPLAY SELECT key to select the appropriate display mode As noted earlier the character in front of the BER result will indicate the current display mode The infinity symbol lt gt indicates Totalize a blank character indicates Window and the T U or R characters indicate Test results which have been measured using the timed untimed or repeat timing modes respectively All Other Results Test Process only To view the complete set of Test results select the VIEW CUR or VIEW PRE functions from the TEST menu VIEW CUR will show partial results if a timed test is in progress or results from the last completed test VIEW PRE will show results saved in the previous test registers These results are over written with the contents of the current registers each time a test is completed Procedure 1 Press Fl to enter the menu system 2 Select the TEST menu F2 3 Press MORE F1 twice to view the third pag
55. of the Generator and Analyzer are shown in Appendix B To return the Generator or Analyzer to this setup use the following procedure 1 Turn instrument power off 2 While holding down the VIEW ANGLE MSB 1 and PATTERN CLEAR keys simultaneously turn instrument power back on 3 After you see the message Default Settings appear in the display release the three keys In a few seconds the normal display format will appear and the instrument will be in its default setup GB700 User Manual 3 5 Common Functions Locking the Front Panel 3 6 The instrument s front panel may be locked or unlocked using the PANEL LOCK control When the front panel is locked all keys that can cause a setup change are disabled It is often useful to lock the front panel during a long or critical test to prevent accidental loss of test results Note that the LED in the PANEL LOCK control indicates whether the front panel is locked LED on or unlocked LED off Procedure C Simply press the PANEL LOCK control to toggle between the locked LED on and unlocked LED off state GB700 User Manual Common Functions Selecting a Pattern The following section defines the patterns that can be generated and analyzed by the gigaBERT700 and how to set up the Generator and Analyzer to use a particular pattern Note that the Generator and Analyzer are compatible with the same suite of test patterns and use the same setup procedures Refer to Chapter
56. of the TSB bit is reevaluated each time one of the bits in the TSR or Test Status Enable Register TSER changes NOTE Used only in the Analyzer Not defined S When you use a serial poll to read the SBR bit 6 is the RQS bit When you use the STB query to read the SBR bit 6 is the MSS bit Bit 3 TSB is used only in the Analyzer GB700 User Manual Using Printers and External Controllers Service Request Enable Register The Service Request Enable Register SRER is the enable register associated with the SBR status register defined above The SRER contains an enable bit for the ESB MAV and TSB bits in the SBR However there is no enable bit for the MSS or the RQS bits That is the MSS and RQS bits are always enabled GB700 User Manual 7 19 Remote Commands This chapter explains the syntax used by the gigaBERT700 remote command language and defines all set and query commands In addition commands are listed and briefly described in both alphabetical and functional order GB700 User Manual 8 1 Remote Commands Overview This section defines the gigaBERT700 command syntax including command types parameter types delimiters used between command elements and terminators used at the end of command lines Symbols Table 8 1 shows the symbols used in this chapter to describe gigaBERT700 commands and responses Table 8 1 Symbols Carriage return ASCII decimal 13 Line Feed ASCII decimal 10 End
57. ohms to 2 V term Data inhibit rate asynchronous 1 bit 500 ps minimum width Data invert front panel select Clock Outputs Format true and compliment Amplitude variable 500 mV to 2 0 V in 50 mV steps Baseline offset variable 2 0 V to 1 8 V in 50 mV steps Pulse top limit 2 8 V into 50 ohms 5 6 V into an open load Rise fall times 20 to 80 200 ps typical when amplitude equals 1 V Jitter 100 ps p p max referenced to EXT CLK Source impedance 50 ohms Connectors SMA A 2 GB700 User Manual Specifications Error Injection Internal rates single or 1E n n 4 5 6 or 7 External error input ECL 50 ohms to 2V 1 error per rising edge External injection rate 50 ns minimum pulse width External error connector SMA Auxiliary Outputs Clock 4 Pattern Sync Level 200 mV p p into 50 ohms 400 mV into high impedance Impedance 50 ohms Clock 4 output system clock 4 toggles on rising edge of system clock Pattern sync pulse PRBS high for 1 bit per frame Pattern sync pulse 16 bit words low for first byte high for second byte etc Pattern sync pulse long words high for one byte each frame location is user programmable Connectors SMA RS 232C and GPIB Interfaces Controlled functions all front panel functions except PANEL LOCK and POWER Read back functions all results and all settings except for PANEL LOCK GPIB terminator character LF line feed OA hex GPIB address Front panel select 0 30 AC Power Requ
58. or Identify a message terminator signal specified in ANSVIEEE Std 488 2 1987 lt non decimal numeric gt A non decimal integer in the range 0 255 decimal with leading H hexadecimal Q octal or B binary Examples Hexadecimal HFF Octal Q377 Binary B11111111 lt qstring gt A quoted string that is a character string with beginning and ending quotes Enclosed argument is required Exclusive OR For example the argument a b c means that you must include one and only one of the following parameters a b or c 8 2 GB700 User Manual Remote Commands Command Types Set and Query There two basic types of gigaBERT700 commands set commands and query commands Set commands are used to make setup changes or to cause a status change for example to start or stop a test Query commands ask the instrument to respond with the contents of a status register or the value of a given setup parameter gigaBERT700 commands may have only a query form or only a set form however most commands have both When a command has both a set and query form the name or mnemonic used for the query form will be identical to its corresponding set command form except for an added For example the following are the mnemonics for the set and query form of the data threshold command O DATA_THRES set command O DATA THRES query command Note that in this User s Guide query commands may be referred to as simply qu
59. pattern to a 223 1 bit PRBS using controls in the PATTERN box as follows a Press PRBS b Press the pattern up down keys until PATTERN is set to PN 23 Verify that the Generator error rate generator is off Ifthe LED in the error inject RATE key is on then press RATE one more times until it turns off Verify that the Analyzer auto search function is enabled Ifthe LED in the AUTO SEARCH key is off then press AUTO SEARCH one time to turn it on At this point verify that the green LOCK LED in the Analyzer SYNC box is on Zero all Analyzer error counts by pressing CLEAR in the ERROR DETECTION group Reset all Analyzer history LEDs by pressing CLEAR in the ERROR HISTORY group Verify gigaBERT700 Analyzer can detect errors by pressing the Generator error inject SINGLE key several times Verify that the Number of Errors count displayed by the Analyzer increments each time the Generator SINGLE key is pressed In effect you are now performing a bit error rate test on the test cables connecting the gigaBERT700 Generator and Analyzer In an actual BER test gigaBERT700 Generator clock and data outputs would be connected to inputs on a device under test DUT while gigaBERT700 Analyzer inputs would be connected to outputs on the DUT GB700 User Manual BERT Basics and Features GB700 User Manual 2 1 BERT Basics and Feature Overview BERT Basics The gigaBERT700 Generator and Analyzer together comprise a 700 Mb s serial bit
60. resynchronize its pattern detector each time BER goes above the pattern synchronization threshold by looking for a new pattern alignment A change of pattern alignment will occur for example if a buffer over flows or under flows in the DUT A change of pattern alignment will also normally occur if the CLOCK input to the Analyzer is momentarily disconnected On the other hand with pattern realignment disabled DISABLE on the Analyzer will not attempt to find a new pattern alignment even if BER goes above the synchronization threshold until the start of a new test interval This allows the analyzer to measure BER and count errors on signals with very high error rates GB700 User Manual Analyzer Functions LOCK Indicator and Actions Taken by the Analyzer if Synchronization Lock is Lost The LOCK LED indicates whether or not BER is above or below the current synchronization threshold The LOCK indicator will turn on while BER is below the current synchronization threshold and off while BER is above this threshold The setup actions taken by the Analyzer when BER crosses the synchronization threshold will depend on the state of the AUTO SEARCH and DISABLE keys as shown in Table 5 1 Table 5 1 Actions Taken by Analyzer when Synchronization is Lost AUTO DISABLE Action when synchronization is lost LOCK LED turns off SEARCH Analyzer will attempt to find new pattern alignment input level input delay PRBS pattern and pattern pola
61. sequence as that recovered by the Analyzer front end circuit MONITOR CLOCK is the corresponding clock signal Because the MONITOR output is a regenerated version of the received test signal bit errors reported by the Analyzer due to noise on the received data or clock signals will be present in the MONITOR DATA output bit sequence Output Setup All three MONITOR ports CLOCK DATA and PSYNC are 50 ohm ECL single ended outputs PSYNC Pulse Location The PSYNC output consists of one pulse per pattern frame This signal is provided to help you view the MONITOR DATA and CLOCK outputs with an external oscilloscope As with the Generator the Analyzer PSYNC pulse location is fixed for PRBS and short word patterns but user programmable for long patterns that is when the 128K Option is installed Use the PSYNC parameter in the WORD menu to set long word PSYNC pulse location as follows Procedure to Set Analyzer PSYNC Location 1 Press the F1 key to enter the menu system 2 Select WORD F4 3 Press MORE F1 4 Select PSYNC F4 5 Use the F2 F3 and pattern up down keys to edit the PSYNC pulse byte location 6 Press F4 to set this PSYNC location and exit the PSYNC parameter 7 Press F1 multiple times to exit the menu system GB700 User Manual Analyzer Functions Error Detection Set Up Overview The gigaBERT700 Analyzer calculates error results using three different methods Window Test and Totaliz
62. signal generation and analysis or maximum jitter testing Please contact Tektronix for specifications and availability of user defined or factory defined PROM patterns Selecting the Active Pattern In this User s Guide the pattern currently being generated by the Generator or analyzed by the Analyzer is called the active pattern Procedures to make a selected PRBS word or mark density the current active pattern are provided below Selecting PRBS Patterns To select a PRBS pattern 1 Press the PRBS key The instrument will now be in the PRBS pattern mode 2 Press the pattern up down keys until the name of the desired PRBS pattern is displayed Available PRBS patterns are PN 7 PN 15 PN 17 PN 20 O PN 23 The displayed PRBS pattern becomes the active pattern immediately Oooo Selecting the Current Word Pattern C To make the current word pattern the active pattern simply press the WORD key Selecting RECALLing a Saved Word Mark Density or PROM Pattern You can recall three types of patterns using the Generator or Analyzer RECALL function A word C mark density and C PROM 8 16 bit word patterns are available on all instruments Long word gt 16 bits and mark density patterns are available only in units equipped with the 128K Option PROM patterns are available only in instruments GB700 User Manual 3 9 Common Functions equipped with the PROM Option Note that the PROM Option can be installed only
63. to zero all current results and start a new measurement interval After starting a new TOTALIZE or WINDOW interval you may also reset the bit phase and power history indicators by pressing the ERROR HISTORY CLEAR key GB700 User Manual 5 37 Analyzer Functions 5 38 GB700 User Manual Menus D EH This chapter explains how to use the gigaBERT700 menu system It includes basic rules an overview of the Generator and Analyzer menu structures and a description of each menu function GB700 User Manual 6 1 Menu Functions Menu Basics The following section introduces basic menu concepts Functions Performed Using the Menu System Menu The gigaBERT700 menu system is used to perform two types of functions setup and immediate Menu setup functions are used to set up instrument parameters such as test mode untimed timed or repeat of test duration and window length Setup functions are also used to configure remote ports and to enable or disable reports Menu immediate functions are used to view or print results based on the test in progress or the last completed test Immediate functions are also used to view the instrument s software version or a list of installed options Note that a few menu functions can also be performed using front panel keys for example setting word length However most menu functions do not have front panel equivalents and Function Pages Once you press the F1 key to enter the menu s
64. up down keys to change its value In this example we will change TEST LENGTH from 1 hour as shown above to 30 minutes as shown below F1 ESC F2 gt F3 F4 SET TEST LENGTH 00 30 00 5 Note that there are two ways to exit a function like TEST LENGTH The normal way is to press F4 to lock in your changes and exit the function However you can also exit most functions without making any setup change by pressing F1 to escape In this example we ll press F4 and see the following F1 F2 F3 FA MORE LENGTH MODE REPORT 6 Notice that we ve returned to the TEST menu Next press F3 to enter the MODE function and see the following F1 ESC FA SET TEST MODE UNTIMED GB700 User Manual 6 3 Menu Functions 7 Note that the MODE function has only one field and therefore does not use the F2 and F3 direction keys Press the pattern up key one time to select the timed test mode and see the following F1 ESC F4 SET TEST MODE TIMED 8 As before to lock in this setup change and return to the TEST menu press the F4 key and see F1 F2 F3 FA MORE LENGTH MODE REPORT 9 The last function we ll perform in this example is to enable End of Test and On Error reports To do this select the REPORT function by pressing F4 and see F1 ESC FA SET REPORTS ON NONE 10 Now press the pattern up key three times to select EOT ERROR which will enable both End of Test and On Error reports The REPORT function should now look like the f
65. 0 data off up v and data off dn v occcoocccnononononcnononanon 8 41 data offset v ue ea 8 41 data offset 6a A etg uite eU 8 41 data pattern prbs word rdatal oo occooccccoocccconcnononanonononon 8 19 data pattern s cdd et te Hina p Re RR HEC REO A Et 8 20 data term neg 2v gnd ac pos 3v sssssss 8 58 A canit eni ite cease pp RUM pi eee 8 58 data thr up and data thr dn 2 esee 8 59 8 8 GB700 User Manual Remote Commands data_thr_up v and data thr dn v 8 59 AGA TPS or asesinos ms eudt ternos tege esee 8 59 data Chro oso dec rtt atu tee a asp eite 8 60 date yyyy mm dad T acest tere ROT te EE P EUIS 8 84 qute e Edi pM aes C cs de el e AL eer s 8 84 disp select total window test oooocoocccconocccononononcnononanons 8 64 di8p Selecb ienesa rmt i rue a Doct dd deditum 8 65 edit DE a iii 8 91 o Baines an eec EB CO eR eR en eee 8 91 o eter E c eR rene me On em 8 92 error rate offlext rate 3lrate 4lrate 5lrate 6lrate 7 8 43 GPPOD TALE weeds dh esee D ue Pos eU da 8 43 CITOP reseb X 8 65 error single conri do 8 43 ED dre id 8 26 gpib address tronura te o eU cin weer EE eM Wai 8 26 gpib bus off bus talk listen eene 8 26 gpib D S cb so Sam idi eis eie 8 27 header On ota a 8 31 TG AMOI se D 8 31 histiy DIGSSIM n we
66. 0 1 A1 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use GB700 User Manual A 7 Specifications Pattern Specifications Generator and Analyzer Data Patterns Format NRZ L normal and compliment PRBS patterns 20 1 n 7 15 17 20 23 Word pattern length 16 bits 128 K bits optional Word pattern bit order LSB or MSB first Number of word pattern memories 8 plus the current word PRBS Pattern Phase Tap Information The PRBS patterns used in the gigaBERT700 Generator and Analyzer are generated by a shift register and exclusive OR feedback technique The pattern is dependent on which feedback taps shift register outputs are selected For example PN7 is defined to be a seven stage shift register with the output of stages 6 and 7 fed back through an exclusive OR gate to the input of stage one of the shift register The feedback taps used in gigaBERT700 Generator and Analyzer PRBS circuits are listed below Pattern Feedback Taps PN 7 6 and 7 PN15 14 and 15 PN17 14 and 17 PN20 17 and 20 PN23 18 and 23 A 8 GB700 User Manual Default Settings 7 This appendix lists factory default settings for the gigaBERT700 Generator and Analyzer GB700 User Manual B 1 Default Settings How to Recall Factory Default Settings Using Front Panel Controls Use the following procedure to recall the factory default settings of the Generator or Analyzer using front panel
67. 0 will discard the command and issue an error message Command Format Please refer to Chapter 8 for an explanation of the gigaBERT700 command line format and a description of all commands Note that the basic command format used on the RS 232C and GPIB ports is the same GB700 User Manual 7 5 Using Printers and External Controllers Error Messages All commands received on the RS 232C port are checked for validity and to make sure they contain appropriate parameters Valid commands are executed Invalid commands will not be executed but instead will cause the Generator or Analyzer to transmit one of the error messages shown in Table 7 3 Table 7 3 RS 232C Port Error Messages Input Lost The RS 232C interface hardware has detected one or more lost or corrupted characters Input Buffer Overflow More than 80 characters are received without a line terminator Command Mnemonic Not Found Unknown command mnemonic received Invalid Command For Interface Command mnemonic found but it is not valid for the RS 232C interface Invalid Command Type Command mnemonic found but it has a missing or added at the end Too Few Parameters One or more expected parameters are missing Too Many Parameters Too may parameters were received or unknown characters were found trailing the command Invalid Parameter Parameter is not valid for the command Parameter Out of Range Parameter value i
68. 6 384 Bits n Set this parameter to the number of extra bits in the pattern length That is if length is M bytes N bits set this parameter to N Range 0 to 7 GB700 User Manual 6 11 Menu Functions Word Fill FILL Format F1 ESC F4 SET FILL WORD MEMORY WITH hh Menu WORD Function Name FILL Instruments Analyzer and Generator Options Requires the 128K Option Application Use this function to fill all bytes in the current word with the same 8 bit pattern Parameters Fill Byte hh Enter the hex value for the fill byte Range 00 to FF Notes You may use the fill function as the basis for a new word pattern then edit individual bytes using the WORD EDIT function to create the exact pattern that you need 6 12 GB700 User Manual Menu Functions Word Order ORDER Format F1 ESC F4 SET WORD ORDER ccc FIRST Menu WORD Function Name ORDER Instruments Analyzer and Generator Options Requires the 128K Option Application Use this function to change the transmit or analysis bit order MSB first or LSB first of the current word pattern Parameters Word Order ccc May be set to LSB or MSB Note Word order also applies to the fractional end byte in patterns that do not contain an exact multiple of eight bits GB700 User Manual 6 13 Menu Functions 6 14 Word Sync Pulse PSYNC Format F1 ESC F4 SET PAT SYNC AT BYTE ddddd Menu WORD Function Name PSYNC Instruments
69. AM MESSAGE UNIT SEPARATOR gt COMMAND MESSAGE UNIT QUERY MESSAGE UNIT COMMAND PROGRAM HEADER gt QUERY PROGRAM HEADER gt PROGRAM HEADER SEPARATOR gt PROGRAM DATA SEPARATOR gt PROGRAM DATA DECIMAL NUMERIC PROGRAM DATA CHARACTER PROGRAM DATA lt NON DECIMAL NUMERIC PROGRAM DATA The gigaBERT700 cannot process a compound command program header or a compound query program header For more information on this subject see Sections 4 3 7 1 1 and 7 3 3 of ANSI IEEE Std 488 2 1987 Specific Command Implementations Reset Command As defined in ANSI TEEE Std 488 2 1987 the gigaBERT700 reset command rst does the following dl Resets all device settings to their default values Appendix B except for a stored word patterns Analyzer and Generator b stored frequencies Generator only and c all remote interface settings 2 Ignores macros macros are not implemented in the gigaBERT700 3 Forces the gigaBERT700 into the Operation Complete Command Idle State OCIS and Operation Complete Query Idle State OQIS Self Test Query The scope of the gigaBERT700 self test function is limited it tests basic functionality GB700 User Manual 7 11 Using Printers and External Controllers Overlapped vs Sequential Commands All gigaBERT700 commands are sequential Operation Complete Message gigaBERT700 command operation is always immediate There are no overl
70. Advanced Test Equipment Rentals A ished 1981 www atecorp com 800 404 ATEC 2832 User Manual gigaBERT700 Generator and Analyzer 070 9393 02 This document supports firmware version 3 0 and above Table of Contents Copyright O 1998 Tektronix Inc All rights reserved Licensed software products are owned by Tektronix or its suppliers and are protected by United States copyright laws and international treaty provisions Use duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 or subparagraphs c 1 and 2 of the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 as applicable Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specifications and price change privileges reserved Printed in the U S A Tektronix Inc P O Box 1000 Wilsonville OR 97070 1000 TEKTRONIX and TEK are registered trademarks of Tektronix Inc GB700 User Manual Table of Contents WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment If any such product proves defective during this warranty period Tektronix at its option either will repair the defective product wi
71. Analyzer SYNC Controls esee 2 20 Menu OVNI et ee lee ee eene ete eine qe aida 2 22 Common Functions nanei esoe i e e 3 1 AC POWEE eae eda os a A a e i AN E daa 3 2 LCD Viewing Angle terne erre Re ER Ree iE eoh 3 4 Recalling Default Set p e ite e Rete ee et eR nen 3 5 GB700 User Manual V Table of Contents Locking the Front Panel eese nee 3 6 Selecting Pattern ort ecd ee lesa ide isa 3 7 Pattern Definitions oooocccccncncncnnnnononononononononononononononononononinananonos 3 7 Selecting an Active Pattern 3 7 Selecting Recalling a Saved Word Mark Density or PROM Pattern 3 9 Word Patterns dE 3 11 BASICS A AS hg coe Rv A nel ROS ee eee os es 3 11 Creating Word Patterns using front panel 3 12 Creating Word Patterns using menus 0 0 0 0 eee eeeeteceeeeeeeseetentnaeeees 3 13 Creating Word Patterns using remote control esssss 3 14 Saving Word Patterns erossa RR ERR 3 15 Recalling Word Patterns esee 3 16 Generator EUnctons siii sli C VV dV 9 Dix Ra I PARV UK Ve LV 4 1 Clock Source and Frequency oocccccncnnnnonnnonononononononononononononononononononos 4 2 Data and Clock O tputs tct iia 4 5 PYNC and CLOCKIA OUUQULS esie Ep be sep den tds idea 4 10 Error Injection TN 4 11 JXata DBDSDIU oce e SAU als te Rt Er TERM EDS can ts 4 13 Analyzer F nctlons esos es s eee ovi on eh ene eva IE vl oh Ta
72. Arguments neg 2v 50 ohms to 2 volts gnd 50 ohms to ground ac 50 ohms via 0 01 uF capacitor to ground pos 3v 50 ohms to 3 volts Example clock_term gnd 8 54 GB700 User Manual Remote Commands clock_term Clock Termination Query Returns a character string indicating the current Analyzer clock input termination setup Min Abbr clock_ter Returns neg 2v gnd ac pos 3v Example clock term command CLOCK TERM GND response clock thr up and clock thr dn Clock Threshold Up Down Default This command pair is used to increment clock thr up or decrement clock thr dn the current Analyzer CLOCK input threshold voltage by the default increment of 0 05 volts Min Abbr clock thr u clock thr d Argument none Example clock thr up clock thr dn clock thr up v and clock thr dn v Clock Threshold Up Down This command pair is used to increment clock thr up or decrement clock thr dn the current CLOCK input threshold voltage by v volts Min Abbr clock thr u clock thr d Argument v lt NR2 gt 0 05 to 6 00 Example clock_thr_up 0 10 clock_thr_dn 0 10 GB700 User Manual 8 55 Remote Commands clock_thres v Clock Threshold Sets the threshold voltage for the Analyzer CLOCK input to v where the allowed range for v depends on the current input clock termination Min Abbr clock_thre Arguments V 3 00 to 4 50 in steps of 0 05 see Table 5 5 for limits based on Termination Example cl
73. BERT Basics and Feature Overview Connectors Terminations and Levels Tables 2 1 and 2 2 below summarize the physical interface characteristics of all gigaBERT700 Generator and Analyzer inputs and outputs Table 2 1 Generator Inputs and Outputs Label Type Type and offset DATA BAR OUTPUT sector M e i e e PATTERN SYNC OUTPUT secon When GND termination is selected 0 5V 2 0V p p around a threshold of 0 0V When 2V termination is selected 0 5V 1 4V around a threshold of 1 3V 2 14 GB700 User Manual BERT Basics and Feature Overview Table 2 2 Analyzer Inputs and Outputs Connector Signal Connector Impedance threshold and delay Label Type Type DATA DATA BAR input INPUT SMA female 50 ohm variable threshold and delay Selectable termination GND 2 V 3V AC CLOCK CLOCK input INPUT SMA female 50 ohm variable threshold BAR Selectable termination GND 2 V 43V AC REF DATA input INPUT SMA female 50 ohm ECL variable delay selectable termination GND 2V 3V AC e PATTERN SYNC MONITOR SMA fema 50 ohm 200mV into 50 CLOCK MONITOR SMA female 50 ohm 200mV into 50 DATA MONITOR SMA female 50 ohm 200mV into 502 ERROR INHIBIT input rear pane BNC female 50 ohm ECL INPUT RZ ERROR output rear pane BNC female 50 ohm 200mV into 50Q OUTPUT 25 pin D male Compatible with PC parallel printers 25 pin D male RS 232 levels and impedance GPIB IEEE 488 standard levels and impedance
74. CLOCK DATA and REF DATA 5 9 Input Threshold Range as a Function of Termination 5 11 Mark Density Patterns 3 8 Menu Descriptions 6 6 Numeric Response Types 7 5 Index W Output Setup Rules vs Termination Impedance 4 7 PRBS 2N 1 Test Patterns 3 7 RS 232C Serial Port Parameters 7 4 RS 232C Connector Pin out 7 5 RS 232C Port Error Messages 7 7 SESR Bit Definitions 7 4 Status Byte Register Bit Definitions 7 5 Status Registers Enable Registers and Related GPIB Commands 7 7 Symbols 7 4 Synchronization Threshold 5 6 Synchronization Thresholds with 128K Option Installed A 6 Test Status Register Bit Definitions 7 5 Using F2 F3 to Select Input Set up 2 20 Word Patterns 3 11 Basics 3 11 Creating Word Patterns using front panel 3 12 Creating Word Patterns using menus 3 13 Creating Word Patterns using remote control 3 14 Recalling Word Patterns 3 16 Saving Word Patterns 3 15 GB700 User Manual
75. DATA_TERM NEG_2V response rdata_thr_up and rdata_thr_dn Reference Data Threshold Up Down Default This command pair is used to increment rdata_thr_up or decrement rdata_thr_dn the current REF DATA threshold by the default increment of 0 05 volts Min Abbr rdata_thr_u rdata_thr_d Argument none Examples rdata_thr_up rdata_thr_dn rdata thr up v and rdata thr dn v Reference Data Threshold Up Down This command pair is used to increment rdata thr up or decrement rdata thr dn the current REF DATA threshold by v where v is in NR2 format and may be set in the range 0 05 volts to 6 00 volts Min Abbr rdata thr u rdata thr d Argument v lt NR2 gt 0 05 to 6 00 volts Examples rdata_thr_up 0 10 rdata_thr_dn 0 50 rdata_thres v Reference Data Threshold Sets the threshold voltage for the Analyzer REF DATA input to v where the allowed range for v depends on the current input clock termination Min Abbr rdata_thre Arguments v 3 00 to 4 50 in steps of 0 05 see Table 5 5 for limits based on Termination Example rdata_thres 1 00 8 62 GB700 User Manual Remote Commands rdata_thres Reference Data Threshold Query Returns the current threshold voltage for the Analyzer REF DATA input Min Abbr rdata_thre Returns lt NR2 gt Example rdata_thres command RDATA_THRES 1 00 response GB700 User Manual 8 63 Remote Commands Error Detector and History Setup Commands auto_searc
76. EF DATA OU Single ended or differential operation CLOCK DATA GB700 User Manual 5 7 Analyzer Functions 5 8 Note that user or manual control functions may be executed locally via front panel controls or menus or remotely via the instrument s RS 232 or GPIB ports Controls The INPUT section controls that are used to set up input parameters are QO DELAY key DIFF key TERM key THRESH key INPUT f 1 Keys INVERT key QO THRESH key In addition the state of the F2 and F3 function keys determines the action of the INPUT up down keys as shown in Table 5 3 Note that this function of the F2 and F3 keys does not apply while the Analyzer is in the menu mode Ooooo Table 5 3 How F2 and F3 Determine Which Input Can be Set Up Input that can be adjusted using the T 1 Keys Use of the Display The Analyzer display will normally show the currently selected delay parameter DATA or REF DATA in the bottom left field and the currently selected threshold parameter CLOCK DATA or REF DATA in the bottom right field In addition the bottom middle field will show whether or not input data inversion is enabled Specifically ifthe INVERT DATA key is on then the message INV will appear after the name of the current pattern for example PN 23 INV GB700 User Manual Analyzer Functions Input Data Delay Up to 4 ns of delay can be added to the DATA and REF DATA inputs to adjust their phase alignment with the input c
77. ERROR RATE NUMBER OF ERRORS PANEL VIEW LOCK ANGLE PATTERN E CLOCK REF CLOCK REF DATA INPUT DATA E adi 5 6 0Vp p 5000 5 6 0Vp p 5000 5 6 0Vp p ERROR INHIBIT ERROR INPUT OUTPUT PRINTER g 2 6 gigaBERT700 ANALYZER ERROR INJECT YNCL ex Los CLEAR OFFSET PHASE B ERROR DETECTION DISPLAY SELECT CLEAR mE DISABLE ae MONITOR OUTPUT PATTERN CLOCK SYNC io 200mVp p Qa O GPIB IEEE STD 488 PORT SH1 AH1 T6 L4 SR1 RL1 PPO DC1 DTO C0 E2 WARNING ELECTRICAL SHOCK HAZARD THIS INSTRUMENT MUST BE GROUNDED DO NOT OPEN INSTRUMENT REFER SERVICING TO QUALIFIED PERSONNEL DISCONNECT POWER CORD BEFORE REPLACING FOR CONTINUED FIRE PRODUCTION REPLACE ONLY WITH SPECIFIED FUSES VOLTAGE MAX FUSE 250V 5x20mm RANGE POWER UL 198 G IEC 127 90 132V 2A TIME DELAY 180 250V 1A TIME DELAY AUTOMATICALLY FREQUENCY 47 63Hz SELECTED GB700 User Manual BERT Basics and Feature Overview Display Formats The normal display format for the Generator and Analyzer are explained below Note that the normal format is simply the format of the display when not in the menu mode The display format used in the menu mode is explained in Chapter 6 Generator Display The Generator has a two line by 24 character high contrast liquid crystal display LCD The Generator display in its normal non menu mode is illustrated in Figure 2 5 Figure 2 5 Generator Display in Its Normal Non menu
78. Echo Enables or disables character echo on the RS 232C serial port Min Abbr rs e Arguments on instrument will echo back each character received off instrument will not echo received characters Example rs echo on rs echo RS 232C Echo Query Returns a character string indicating whether RS 232C port echo is enabled ON or disabled OFF Min Abbr rs e Returns on off Example rs echo command RS ECHO OFF response rs pmt lf on off RS 232C Prompt Line Feed This command may be used to add the current RS 232C end of line EOL terminator that is CR LF CR LF or LF CR to the end of the prompt This feature may be useful when operating the instrument under program control via a serial RS 232 link Min Abbr rs pm Arguments on EOL terminator added to end of prompt off no terminator added to prompt GB700 User Manual 8 27 Remote Commands Example rs pmt lf on rs pmt lf RS 232C Prompt Line Feed Query Returns a character string indicating whether RS 232C prompt line feed is enabled on or disabled off Min Abbr rs pm Returns on off Example rs pmt lf RS PMT LF ON rs prompt s RS 232C Prompt This command sets the prompt on the RS 232C port to the character string contained in the quoted string s This string will appear at the start of each new line on a terminal display Min Abbr rs pr Arguments s lt qstring gt a character string inside double quotes Exam
79. F3 and pattern up down keys to enter a byte address aot e IT Press F4 to set this address or F1 to escape without making a change 7 Press Fl several more times until you see the normal format on the display GB700 User Manual 4 11 Generator Functions Error Injection The gigaBERT700 Generator can inject bit errors also known as logic errors into the output data pattern One use of error generation is to self test the gigaBERT700 Generator Analyzer system Or when generating word patterns containing simulated framed signals for example a SONET signal error generation can be used to determine the ability of the terminal under test to detect errors or to stay in frame in the presence of high error rates The available internal error injection rates are 101 where n 7 6 5 4 or 3 In other words injected BER can be set to integer powers of 10 from 10 7 to 10 3 Using the external error inject mode errors can be injected at any rate up to 10 3 There is no lower limit on external error injection BER Selecting an Error Inject Mode The controls that determine the error injection mode of the Generator are C RATE key O SINGLE key When the LED on the RATE key is off the Generator is in the single error inject mode In this mode no errors are generated except when the SINGLE error key is pressed That is each press of the SINGLE key will cause a single isolated bit error to be injected However when t
80. Glossary GB700 User Manual Bit Rate The number of bits of data transmitted over a phone line per second Byte A unit of 8 bits Channel A communications path or the signal sent over a channel Through multiplexing several channels voice channels can be transmitted over an optical channel Clock 1 An electronic component that emits consistent signals that paces a computer s operations 2 An oscillator generated signal that provides a timing reference for a transmission link A clock provides signals used in a transmission system to control the timing of certain functions such as the duration of signal elements or the sampling rate It also generates periodic accurately spaced signals used for such purposes as timing regulation of the operations of a processor or generation of interrupts A clock has two functions to generate periodic signals for synchronization on a transmission facility and to provide a time base for the sampling of signal elements In computers a clock synchronizes certain procedures such as communication with other devices Error Detection Checking for errors in data transmission A calculation is made on the data being sent and the results are sent along with it The receiving station then performs the same calculation and compares its results with those sent Code in which each data signal conforms to specific rules of construction so that departures from this construction in the received signals c
81. HAA H55 WORD MEMORY 7 16 HAA H55 WORD MEMORY 8 16 HAA 4H55 WORD MEMORY 9 16 HAA H55 VIEW ANGLE 0 GPIB ADDRESS 14 GPIB BUS OFF BUS End of Test Reports When End of Test reports are enabled one End of Test report will be generated each time the end of a Test interval is reached This can occur automatically when timing mode is set to Timed or Repeat or manually when the user stops an Untimed test by pressing the CLEAR key Use the REPORT parameter in the TEST menu to enable or disable End of Test reports An example End of Test report is shown in Figure 5 6 Figure 5 6 Example End of Test Report Tektronix Inc GB 700 TEST SUMMARY Jun 14 92 02 42 48 TEST MODE TIMED FREQ 100 0 MHz ERROR THRES E 05 TIME ALARMS PERFORMANCE START Jun 14 92 02 43 26 SIG LOSS OS US 0 0 096 STOP Jun 14 92 0s 43 31 SYNC LOSS OS SES 0 0 0 ELAPSED 000 00 00 05 PHASEERR OSTES 5 100 0 ES 5 100 096 ERRORS BITS EFS 0 0 0 TOTAL ERRS 000050000 AVG RATE 1 0E 04 DM 0 0 0 TOTAL BITS 500002816 CUR RATE 1 0E 04 GB700 User Manual 5 25 Analyzer Functions You can set up the Analyzer to generate End of Test Reports as follows Procedure to Enable or Disable End of Test Reports Complete the basic report setup procedure Press F1 to enter the menu system Select the TEST menu F2 Select the REPORT parameter F4 You may now either enable End of Test reports by selecting END OF TEST or EOT ERROR or disable End of Test re
82. INDOW SECOND function Parameters Window Mode ccccccc May be set to BITS or SECONDS 6 24 GB700 User Manual Menu Functions Window Interval in Bits BITS Format F1 ESC F4 SET WINDOW LEN 1 0eEE BITS Menu WINDOW Function Name BITS Instruments Analyzer only Options None required This is a standard feature Application When WINDOW MODK is set to BITS use this function to set window duration in terms of bits Parameters Window Length EE May be set from 1 0e08 to 1 0e16 GB700 User Manual 6 25 Menu Functions Window Interval in Hrs Min Sec SECOND Format Fl ESC F2 gt F3 F4 SET WINDOW LEN hh mm ss Menu WINDOW Function Name SECOND Instruments Analyzer only Options None required This is a standard feature Application When WINDOW MODE is set to SECONDS use this function to set window duration in terms of hours minutes and seconds Parameters Window Length hh mm ss hh Set from 00 to 23 mm Set from 00 to 59 ss Set from 00 to 59 6 26 GB700 User Manual Menu Functions Window Reports REPORT Format F1 ESC F4 SET END OF WINDOW PRINT ccc Menu WINDOW Function Name REPORT Instruments Analyzer only Options None required This is a standard feature Application Use this function to enable or disable End of Window reports Parameters End of Window Print ccc May be set to ON or OFF Notes To print End of Window reports be sure ON OFF par
83. IT Will turn on if a bit error is detected O PHASE Will turn on if a phase error is detected The Analyzer will report a phase error when the active clock edge moves too close to the data waveform transition point thus violating the input circuit setup or hold time C POWER Will turn on after a power loss has occurred CLEAR Control Pressing the CLEAR key will reset all active history indicators Note that when you start a test you must clear test results and history indicators by pressing the ERROR DETECTION CLEAR and ERROR HISTORY CLEAR keys respectively GB700 User Manual 5 33 Analyzer Functions Audio Beeper Function The Analyzer may be set up to beep each time a second is detected in which BER is above a specified threshold The AUDIO VOL and RATE controls are used to configure this function Procedure To Set Up the Audio Alert Function 1 Press the AUDIO RATE up or down keys to increment or decrement the current audio alert BER threshold The current value of the AUDIO RATE will be displayed in the bottom right field of the display for about seven seconds after the last key press Available selections are 1E x where x 2 3 16 2 Press the AUDIO VOL up or down keys to increment or decrement the current audio alert volume There are four volume levels The minimum value is OFF Except when volume is set to the minimum level a beep will occur each time you press an AUDIO VOL up or down key to indic
84. LE off Similarly turning DISABLE on automatically turns AUTO SEARCH off That is AUTO SEARCH and DISABLE cannot be on at the same time However you may turn both functions off There are therefore three possible levels of Analyzer synchronization 1 AUTO SEARCH on This is the most automated mode 2 AUTO SEARCH off and DISABLE off This is a partially automated mode with AUTO SEARCH functions disabled but auto pattern resynchronization still enabled 3 DISABLE on This is the fully manual mode in which all AUTO SEARCH functions and the auto pattern resynchronization function are disabled GB700 User Manual 5 5 Analyzer Functions Synchronization LOCK Threshold The current synchronization threshold depends on pattern and the setup of the SYNC menu as summarized in Table 5 2 below Table 5 2 Synchronization Threshold PRBS 1 024 errors in 4 096 bits Fixed BER 2 5 E 01 All word patterns up to 16 bits 256 errors in 4 096 bits Fixed when 128K Option not BER 6 3 E 02 installed All word mark density or other Based on 256 errors in a Use SYNC menu to select a ROM patterns with 128K Option rolling window of x bits Nine synchronization level from installed BER levels available 1 to 9 1 3 1 E 02 7 8 E 03 1 9 E 04 9 7E 04 4 8 E 04 2 4 E 04 1 2 E 04 6 1 E 05 3 0 E 05 Oe oo RO You can change the synchronization threshold for long word mark density and ROM patterns using t
85. Mark density patterns are not however simple 1 n patterns composed of isolated 1s separated by n 1 Os Rather they are randomized to better simulate live traffic with a particular average 1s density Note that the mark density pattern function are part of the 128K Generator or Analyzer option The mark density patterns generated and analyzed by the gigaBERT700 are listed in Table 3 3 Table 3 3 Mark Density Patterns Label of Pattern Average Mark Used in Display Density MRK 1 8 12 5 MRK 1 2 50 MRK 3 4 75 MRK 7 8 87 5 Word Patterns Word patterns are programmable by the user Word patterns can be designed to cause specific stress characteristics such as maximum jitter or to simulate framed patterns like SONET SDH or FDDI The standard gigaBERT700 Generator and Analyzer will allow you to create and save up to eight 16 bit two byte word patterns in battery backed memory Or with the 128K Option installed you can create and save up to eight 128 kbit word patterns in battery backed memory Note that the standard and 128K instruments also store the current word pattern in battery backed memory PROM Patterns Option The gigaBERT700 can be equipped at the factory with optional programmable read only memory PROM chips containing up to 10 additional patterns PROM patterns may be defined by the customer but are not field programmable Example PROM pattern applications are GB700 User Manual Common Functions framed
86. ORD_MEM_ORD 1 LSB response which indicates that the word order of word memory location 1 is least significant bit first GB700 User Manual 8 23 Remote Commands word_memory m le b1 b2 Word Memory Stores into word memory m the word pattern of length le with a bit sequence represented by b1 and b2 Min Abbr word_memo Arguments m decimal in range 0 to 9 le 8 or 16 bl 00to FF hexadecimal Q000 to Q377 octal B00000000 to B11111111 binary b2 sameasbl1 However b2 is allowed only if le length is set to 16 Example word memory 3 16 HC4 HFO Stores the 16 bit sequence CAFO0 hex into word memory 3 word memory m Word Memory Query Returns the 8 or 16 bit pattern saved in word memory m in the form m byte 1 byte 2 where m is either 8 or 16 word length in bits and byte 1 and byte 2 are hex representations of the first and second bytes in the pattern Note that byte 2 will be included only if pattern length is 16 Min Abbr word memo Arguments m 8 or 16 Returns lt NR1 gt lt NR1 gt lt non decimal numeric s gt Example word_memory 4 command WORD_MEMORY 4 H87 H76 response word order msb lsb Word Order Sets the bit order of the current word to MSB or LSB first Min Abbr word_o Arguments msb most significant bit first Isb least significant bit first Example word order lsb 8 24 GB700 User Manual Remote Commands word_order
87. Pa Pa soosse PU PEE EP eva PE PE sinss 5 1 Automatic Setup Functions SYNC 5 2 Synchronization LOCK Threshold sssseee 5 6 Clock Data and Reference Data Inputs ooocccccccnononononononononononononos 5 7 Monitor OUIDUIS cede e ee eee oie beeen pee det d e e den 5 13 Error Detection Set up enrii iin inisieer eene enne tenerent ene 5 14 Viewing Results eec mi ee ivre te PH Sen 5 21 Printing Results Reports ooooocccccononononononononononononononononononononinanonos 5 22 Result D finitions ocio rindas tt eeepc HERE REPE aes 5 28 Error History Indicators ooooococccccononononocononcnnnnnnnonononcncnnonnnnononononccccnnnns 5 31 Audio Beeper Functi0N oococccocnnnnononononononononononononononononononononanononos 5 32 Analyzer Error Messages oroen ereat eeraa eeN i aea Riin 5 33 Starting amp Stopping Measurements essere 5 34 vi GB700 User Manual Table of Contents Mentis ssi cosi sssscccsned ceoacsssseacsnscncescasasnacaneancassnsesvensessonsacibasecesesecneasneatescsesacreseacacs 6 1 MENU Basics eene eet tias 6 2 Menu Summaries e E e AA i 6 6 Menu Function Definitions cococccccnnononononononononononononononononononononinonos 6 9 Word Edit EDIT culto e cie iere etel tee 6 10 Word Length CENG TH J r oraino cann innean oaro iese r a Sa 6 11 Mord Bill BIED eire terree a a e E 6 12 Word Order ORDER ssssseseesessssssesceressssssesceressss
88. R WARRANTIES EXPRESSED OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES GB700 User Manual iii Table of Contents How to Reach Customer Service If you have any questions regarding the operation maintenance repair or application of your Tektronix equipment contact your local sales and service office For a complete list of the Worldwide Sales and Service Offices visit our web site Tektronix provides high quality Technical Support on applications Operation measurement specifications hardware and software by expert application engineers For Applications Support call the Customer Support Center listed below Mailing Tektronix Inc Attn Customer Service Address Measurement Business Division P O Box 500 Beaverton Oregon 97077 0001 USA Customer 1 800 833 9200 Hours are 6 00 AM to 5 00 PM and Sales Pacific Time Support Center Fax 503 627 5695 E Mail support tek com Web Site http www tektronix com iv GB700 User Manual Table of Contents Table of Contents AAN A A A esta e AA x
89. RT Press this key to select either the data non inverted LED off or data inverted LED on mode EXT This is an input for an external data reference signal NOTE Use the F2 and F3 function keys to determine which input will be affected by the DELAY THRESH TERM and DIFF controls as follows Table 2 3 Using F2 and F3 to Select Which Input to Set Up Analyzer ERROR DETECTION Section The ERROR DETECTION section contains the following test setup and display controls 2 20 a a a a DISPLAY SELECT Use this control to select which results are displayed in the BER the Bit Error fields The options are Window Totalize or Test CLEAR Press this key to clear previous results and to start or stop timed tests AUDIO VOL T 1 Use these keys to increase or decrease the volume of the Analyzer s error beeper function AUDIO RATE 1 1 Use these keys to increase or decrease the error rate threshold of the beeper function Selections are 1E x where x 2 3 16 GB700 User Manual BERT Basics and Feature Overview Analyzer SYNC Controls The ERROR DETECTION section contains the following SYNC controls which are used to set up the Analyzer s automatic synchronization functions C AUTO SEARCH Press this key to enable LED on or disable LED off the AUTO SEARCH feature With AUTO SEARCH enabled each time BER goes above the synchronization threshold LOCK LED turns off the Analyzer will automatical
90. Test Results on page 8 44 Min Abbr res c Returns lt NR3 gt Example res_cur_rate command RES_CUR_RATE 1 00E 6 response GB700 User Manual 8 45 Remote Commands res_dm Results Degraded Minutes Query This command returns the number of degraded minutes counted either in the current interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_dm Returns lt NR1 gt Example res_dm command RES_DM 12 response res_dm_per Results Degraded Minutes Query This command returns the percentage of degraded minutes calculated either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_dm_ Returns lt NR2 gt Example res_dm_per command RES_DM_PER 20 20 response res_efs Results Error Free Seconds This command returns the number of error free seconds counted either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_efs Returns lt NR1 gt Example res_efs command RES_EFS 273 response 8 46 GB700 User Manual Remote Commands res_e
91. _bits Window Bits Returns the number of bits received so far in the window interval Min Abbr win_bits Returns lt NR1 gt Example win_bits command WIN_BITS 49098302 response win_error Windows Errors Returns the number of bit errors counted so far in the window interval Min Abbr win_e Returns lt NR1 gt GB700 User Manual 8 75 Remote Commands Example win_error command WIN_ERROR 27 response win mode bits I sec Windows Mode Determines whether window length is determined by the windows bits length parameter or the windows seconds length parameter Min Abbr win m Arguments bits selects the windows bits length parameter sec selects the windows seconds length parameter Example win mode bits win mode Windows Mode Query Returns the current windows length mode Min Abbr win m Returns bits sec Example win mode command WIN MODE BITS response win prev current previous Window Previous Sets the WIN PREV parameter to current or previous This parameter determines whether Analyzer responses to win bits win error win rate and win time queries will be based on the current window interval or the previous window interval Min Abbr win p Arguments current selects the current window interval previous selects the previous window interval Example win prev current win prev Window Previous Query Returns the current value of the WIN PREV parameter
92. a must be less than the length which can be specified by the byte length command byte block a i b1 bn Byte Block This command overwrites a block of i bits in the edit pattern beginning at address a with the overwrite pattern indicated by bytes b1 through bn Min Abbr byte b Arguments a NRI in the range 0 to 16 383 the starting address of the overwrite block i NRI in the range 1 to 80 the number of bits to overwrite bl bn lt non decimal numeric s gt Indicating the bytes that make up the overwrite pattern Each byte may be in the range H00 to HFF hex Q000 to Q377 octal or B00000000 to B11111111 binary Example byte_block 4096 24 HBB H10 HFF byte_block a Byte Block Query Returns the hex octal or binary representation of the 80 bit section of the edit pattern beginning with the bit at address a Note that if there is no editing session in progress this command will return the indicated 80 bit section from the current word pattern Min Abbr byte_b Response a i b1 b2 in format lt NR1 gt lt NR1 gt lt non dec numeric s gt Example byte_block 500 BYTE_BLOCK 500 16 H12 HF1 V NOTE If address a is within 10 bytes of the end of the pattern then less than 10 bytes will be returned Also if the last byte of the pattern is included in the requested block and this byte contains one or more unused bits then these bits will be r
93. age 8 44 Min Abbr Arguments Example test pre current return results from the current test interval previous return results from the previous test interval test prev current GB700 User Manual Remote Commands test_prev Test Previous Query Returns the current state of the test_prev command Min Abbr test_pre Returns current previous Example test_prev command TEST_PREV CURRENT response test_print Test Print This command causes the Analyzer to print a Test Summary report This report has the same basic format and contents as an End of Test report If a test is in progress the report will be based on current interval results If no test is in progress then the report will be based on results from the previous interval Min Abbr test pri Arguments none Example test print test report eot on errorlboth none Test Report This command enables or disables End of Test and On Error reports Min Abbr test r Arguments eot End of Test reports are enabled on error On Error reports are enabled both Both End of Test and On Error reports are enabled none Neither End of Test nor On Error reports are enabled Example test report both GB700 User Manual 8 71 Remote Commands test_report Test Report Query Returns a character string indicating the current setup of the test report parameter Min Abbr test_r Returns eot on error both none Example test report
94. ameter in PRINT menu is set to ON GB700 User Manual 6 27 Menu Functions RS 232 Baud Rate BAUD Format F1 ESC F4 SET BAUD dddd Menu RS232 Function Name BAUD Instruments Analyzer and Generator Options None required This is a standard feature Application Use this function to set the baud rate of the serial RS 232C port Parameters Baud rate dddd May be set to 300 600 1200 2400 4800 or 9600 6 28 GB700 User Manual Menu Functions RS 232 Parity PARITY Format F1 ESC F4 SET PARITY cccc Menu RS 232 Function Name PARITY Instruments Analyzer and Generator Options None required This is a standard feature Application Use this function to set parity for the serial port Parameters Parity cccc May be set to ODD EVEN or NONE GB700 User Manual 6 29 Menu Functions RS 232 Data Bits SIZE Format F4 SET Menu RS232 Function Name SIZE Instruments Analyzer and Generator Options None required This is a standard feature Application Use this function to set the number of data bits per character for the RS 232 serial port Parameters Number of Data Bits d May be set to 7 or 8 6 30 GB700 User Manual Menu Functions RS 232 End of Line Char EOL Format F1 ESC F4 SET EOL ccccc Menu RS232 Function Name EOL Instruments Analyzer and Generator Options None required This is a standard feature Application Use this function to select
95. an be automatically detected Any data detected as being in error is either deleted from the data delivered to the destination with or without an indication that such deletion has taken place or delivered to the destination together with an indication that is has been detected as being in error Error Rate The ratio of the number of data units in error to the total number of data units ES An acronym for Errored Second A second with at least one error GPIB A physical layer interface standard for the interconnection of equipment Line The portion of a transmission line between two multiplexers LOF An acronym for Loss of Frame LOS An acronym for Loss of Signal F 2 Glossary Multi Channel Cable An optical cable having more than one fiber Noise Unwanted signals that combine with and hence distort the signal intended for transmission and reception Residual error rate The error rate remaining after attempts at correction are made RS 232C A physical layer interface standard for the interconnection of equipment Rx Receiver An abbreviation for Receiver A detector and electronic circuitry to change optical signals to electrical signals Tx Transmitter An abbreviation for Transmitter A driver and source used to change electrical signals to optical signals GB700 User Manual Glossary GB700 User Manual F 4 Index A Analyzer Functions 5 1 Analyzer Error Messages 5 33 Audio Beeper Funct
96. and Analyzer Except where noted the following commands are found in both the Generator and Analyzer command sets Pattern and Word Commands Use these commands to select a pattern enable or disable pattern inversion create and save word patterns and perform related pattern functions data_invert on off Data Inversion This command enables or disables logical inversion of the Generator data output bit sequence or the Analyzer input bit sequence Min Abbr data_inv Arguments on enables data inversion off disables data inversion Example data_invert off data_invert Data Inversion Query Returns a character string indicating whether Generator output data inversion or Analyzer input data inversion is enabled on or disabled off Min Abbr data_inv Returns on off Example data_invert command DATA_INVERT OFF data pattern prbs word rdata Data Pattern Sets the Generator pattern mode to PRBS or word or the Analyzer pattern mode to PRBS word or reference data Min Abbr data_p Arguments prbs selects the PRBS pattern mode word selects the word pattern mode GB700 User Manual 8 19 Remote Commands rdata selects the reference data mode Analyzer only Example data_pattern prbs data_pattern Data Pattern Query Returns a character string indicating the current Generator data pattern mode Min Abbr data_p Returns prbs word Generator prbs word rdata Analyzer Examp
97. apping commands 7 12 GB700 User Manual Using Printers and External Controllers GPIB Status and Event Reporting System This section explains the GPIB status and event reporting functions provided by the gigaBERT700 These functions are specified in and compatible with ANSI IEEE Std 488 2 1987 For detailed information on GPIB status reporting functions refer to this document The purpose of the gigaBERT700 status and event reporting system is to alert the GPIB controller when either an important change of status or event occurs The instrument accomplishes this by maintaining several status registers and asserting the SRQ service request line on the GPIB bus when one or more bits in these registers are set to one The controller can then find out which instrument or instruments initiated the SRQ using a serial poll procedure The user can enable or disable specific status bits and therefore control which status changes or events result in an SRQ by setting up various enable registers in the instrument Note that gigaBERT700 status and enable registers are also available when using RS 232C control Specifically you can read status registers and set enable registers via the RS 232C interface However the SRQ alerting function is available only on the GPIB bus Overview of Status and Enable Registers The gigaBERT700 Generator and Analyzer have two general purpose status registers called UA the Standard Event Status Regi
98. are generated on 10 consecutive seconds by enabling the SQUEL feature This is recommended for unattended operation since On Error reports can generate a lot of paper An example On Error report is shown in Figure 5 8 Figure 5 8 Example On Error Reports Tektronix Inc GB 700 TEST START Jun 14 92 02 42 48 TIME 02 42 48 ERRORS 10000 RATE 1 00e 004 TIME 02 42 49 ERRORS 10000 RATE 1 00e 004 SynLos TIME 02 42 50 ERRORS 10000 RATE 1 00e 004 Procedure to Enable On Error Reports 1 Complete the basic report setup procedure 2 Press F1 to enter the menu system 3 Select the TEST menu F2 4 Select the REPORT parameter F4 5 You may now either enable or disable End of Window reports by setting the WINDOW REPORT parameter to ON or OFF 6 Press F4 to lock in your selection 7 Press F1 multiple times to exit the menu system On Demand Test Reports You can generate a test summary report on demand using the PRINT function in the TEST menu While a test is in progress the PRINT function will generate a summary report based results from the current test interval This report will have the same basic format as an End of Test report If a test is not in progress the PRINT function will generate an End of Test Report based on previous results that is results from the most recently completed test interval GB700 User Manual 5 27 Analyzer Functions Procedure to Generate an On Demand Test Summary Report 1 Make sure
99. ate the current volume 5 34 GB700 User Manual Analyzer Functions Analyzer Error Messages When abnormal input conditions are detected the Analyzer will display various error messages to indicate an unusual condition These are explained below QO NO CLOCK This message will appear in the frequency field top left if no activity is detected at the CLOCK input for 20 ms NO DATA This message will appear in the BER field top middle if no activity is detected at the data or clock input for 20 ms C LOW AMP May appear when no signal or a low signal is applied to the CLOCK or DATA input and AUTO_SEARCH is enabled GB700 User Manual 5 35 Analyzer Functions Starting and Stopping Measurements The following section explains how to start and stop TEST measurements and how to initialize or re start WINDOW and TOTALIZE measurements Starting and Stopping TEST Measurements The TEST measurement process has two states started and stopped In the started or active state new current results are accumulated while all results from the previous TEST interval are saved in memory In the stopped state all current results are frozen so that in effect the results from the last two TEST intervals are saved in memory You can tell whether the current TEST process is started or stopped by observing the TEST character T U or R in the display Ifthe displayed TEST character in front of the BER result is blinking then
100. ature Use to select the GPIB end of line termination character or characters GPIB End of Line Terminator cccccc May be set to EOI or EOI LF GB700 User Manual Menu Functions External Clock Term CLOCK Format F1 ESC F4 SET EXT CLOCK TERM ccc Menu Selected from the Generator main menu Function Name CLOCK Instruments Generator only Options None required This is a standard feature Application Use this function to select a termination for the Generator external clock INPUT input Parameters External Clock Termination ccc May be set to GND or 2V GB700 User Manual 6 35 Menu Functions Utility Option OPTION Format F1 ESC options listed here Menu UTIL Function Name OPTION Instruments Analyzer and Generator Options None required This is a standard feature Application Use this function to see which options are installed in your Analyzer or Generator Parameters None This is an immediate function 6 36 GB700 User Manual Menu Functions Utility Version VER Format F1 ESC software version listed here Menu UTIL Function Name VER Instruments Analyzer and Generator Options None required This is a standard feature Application Use this function to see the software version installed in your unit Parameters None This is an immediate function GB700 User Manual 6 37 Menu Functions Date DATE Format Menu Function Name Instruments
101. ces Remote mode edet eter rene cede local Remote header eere on GPIB address Generator sss 15 GPIB address Analyzer sess 14 GPIB terminator oce ib evt e aa EOU LF GPIB DU c extera e bot brodo talk listen RS 282C PEON Pt oie ttt sei t oO etin BERT700 gt RS 232C baud Tata 9600 RS 232C parity cine e M ERA ENTM even GB700 User Manual B 3 Default Settings RS 2320 data size wi estere trier teet eere 8 bits RS 22320 HOU ESEN CR LF R5 2226 XON ROPE cusco on E5 2920 COAG ia apes ikon Aen on RS 232C prompt line feed off View Angle and Panel Lock N ACW NSO ec este d vot da S Oed d 0 A EDS we DE HE R off B 4 GB700 User Manual Default Settings Generator Factory Default Settings Clock Source and Frequency External Clock mode eere INT GND termination Frequency current ninia ii 705 000 MHz Frequency memories 0 through 9 705 000 MHz Frequency step size eese 100 000 MHz Clock and Data Outputs Output clock amplitude sss 1 50 volts Clock baseline offset esee 0 75 volts Output data amplitude sss 1 50 volts Data baseline offset esses 0 75 volts Error injection rate LA eiii tte e et ete off GB700 User Manual B 5 Defaul
102. compare the received data pattern with a data pattern generated internally by the Analyzer However you may also set up the Analyzer to compare two externally generated patterns This makes it possible to analyze framed or proprietary signals that cannot easily be simulated as long word patterns To configure the Analyzer for reference data testing the primary or test signal must be connected to the Analyzer data input which may be set up for singled ended or differential operation while the reference signal is connected to the REF DATA input Then the Reference Data mode must be selected using the EXT key Note that the reference signal must be generated by a singled ended output Procedure for Selecting the Reference Data Mode 1 Connect a test signal to the Analyzer data input and a reference signal to the REF input 2 Press the Analyzer EXT key to toggle the reference mode on Verify that the EXT key turns on 3 To de select the reference mode press the EXT key again Verify that the EXT key turns off GB700 User Manual 5 13 Analyzer Functions Monitor Outputs 5 14 The MONITOR CLOCK and DATA outputs are provided so that you can monitor the test signal as seen by the Analyzer This allows you to attach an error logging device for example to record the exact times that errors occur Or you may attach another type of instrument to make specialized calculations MONITOR DATA is an NRZ output signal with the same bit
103. ct the LENGTH menu by pressing F3 Enter a new value for length using the F2 F3 and pattern up down keys Then exit the LENGTH menu by pressing either F4 to set this new length or F1 to escape without making any setup changes 4 If you want to fill a pattern select the FILL menu by pressing F4 Edit the fill byte using the individual bit keys 1 MSB through 7 LSB When done exit the FILL menu by pressing either F4 to automatically load this eight bit pattern into every byte of the current word or F1 to escape without making any setup changes 5 To edit the current word press F2 to enter the EDIT menu Use the F2 F3 and pattern up down keys to select a byte within the current word Next use the bit keys to edit the displayed byte Repeat for each byte to be edited When done exit the EDIT menu by pressing either F4 to lock in these changes or F1 to escape without making any setup changes 6 You now may want to access the ORDER and PSYNC menus by pressing F1 MORE The ORDER menu determines the bit transmission analysis order of each byte in the pattern that is MSB or LSB first The PSYNC menu determines the byte location of the pattern sync pulse in long word patterns When done with these menus press the F1 key until the normal display format appears You have now created a new word pattern and may use it to perform tests As noted earlier the current pattern is automatically stored in battery backed memory However i
104. ction while the LENGTH FILL and EDIT functions are added to the WORD menu as part of the 128K Option Therefore in standard units all word editing procedures except for bit order are performed using front panel controls However in instruments equipped with the 128K Option word editing may be performed using either front panel controls or the menu system depending on which approach is more convenient in a given situation Note that the WORD menu also includes the PSYNC and SYNC functions If you are trying to observe the Data output of the Generator or the Monitor Data output of the Analyzer you may want to use the PSYNC menu to select the byte location of the pattern synchronization pulse generated by the rear panel PSYNC output The SYNC menu which appears on the same page of the Analyzer menu system is not directly involved in creating or editing word patterns Rather it is used to set the Analyzer pattern synchronization threshold in terms of BER A detailed explanation for each function in the WORD menu may be found in Chapter 6 In addition the general procedure for creating word GB700 User Manual 3 15 Common Functions patterns in a Generator or Analyzer equipped with the 128K Option is given below 1 Use the current pattern or recall a previously saved pattern as the basis for the new pattern See Recalling Word Patterns Press the F1 key to enter the menu system 3 If you need to change current word length sele
105. d pattern in binary format The word may contain either one or two bytes that is 8 or 16 bits Word length 8 or 16 is displayed after the word s bit sequence If you need to change word length press the WORD LENGTH key and then the pattern up or down key to toggle word length between 8 and 16 bits When the desired word length is displayed press the WORD key to return to the word editing mode To select the first or second byte in a 16 bit pattern press the up or down key The selected byte will be indicated in the display by an arrow located between the two bytes Byte selection is not required for 8 bit patterns because the first byte is always selected To edit the selected byte press the 1 MSB through 8 LSB bit keys to toggle individual bits between 0 LED off and 1 LED on If you need to edit the other byte in a 16 bit pattern repeat steps 4 and 5 Instruments Equipped with 128K Option Use the following procedure to create word patterns using front panel controls in instruments that are equipped with the 128K Option GB700 User Manual J If you are using a previously saved pattern as the basis for the new pattern recall this pattern from memory See Recalling Word Patterns Press the WORD key The LED in the word key will turn on to indicate that the instrument is in the word editing mode The selected byte in the current pattern will be displayed in the form AAAAA HH where AAAAA is the byte s location or
106. d sets the length of the edit pattern to m bytes plus n bits Min Abbr byte 1l Arguments m NRI in the range 0 to 16384 n NRI in the range 0 to 7 Example byte length 16384 0 M NOTE If the number of whole bytes m is greater than 4096 then the number of added bits n must be set to 0 byte length Byte Length Query Returns the current length of the edit pattern in terms of whole bytes plus up to seven additional bits Note that if there is no editing session in progress this command will return the length of the current word pattern Min Abbr byte 1 Returns lt NR1 gt lt NR1 gt indicating the number of bytes and the number of additional bits Example byte length command BYTE LENGTH 100 5 response indicating an edit pattern length of 805 bits byte sync n Analyzer only Byte Synchronization This command sets the long word pattern synchronization threshold This threshold does not apply to short word patterns or PRBS patterns The long word synchronization threshold is set in terms of an integer n which corresponds to a BER threshold as explained in Table 5 2 Min Abbr byte s Arguments i NRI in the range 1 highest BER to 9 lowest BER 8 90 GB700 User Manual Remote Commands Example byte_sync 4 V NOTE This command is found in the Analyzer command set only byte sync Analyzer only Byte Synchronization Query Returns a single decimal digit which represents th
107. d to trigger an oscilloscope at a particular section of the output data pattern The second is the CLOCK 4 output which is a clock signal at one quarter the frequency of CLOCK This signal is particularly useful when viewing the output of the Generator using an oscilloscope that doesn t have sufficient bandwidth to trigger on the CLOCK signal Both the PSYNC and CLOCK 4 outputs have a fixed amplitude of 200 mV pk pk centered around ground when terminated by 50 ohms to ground The phase relationship of CLOCK 4 and CLOCK is also fixed with the nominal location of CLOCK 4 transitions occurring on the falling edge of CLOCK The width and location of the PSYNC pulse depends on which pattern type is currently active For PRBS patterns the PSYNC pulse has a width equal to one bit time slot at a fixed position not adjustable by the user For short word patterns 128K Option not installed the PSYNC waveform is a nominal square wave that is high during the first byte of a 16 bit word and low for the second For long word patterns 128K Option installed the PSYNC pulse is one byte wide that occurs at a byte position adjustable by the user with the PSYNC parameter in the TEST menu V NOTE The PSYNC parameter will appear in the TEST menu only if the 128K Option is installed Procedure to set PSYNC location 1 Press Fl to enter the menu system Press F4 to selected WORD Press F1 to select MORE Press F4 to enter the PSYNC menu Use the F2
108. data_del_up or decrement rdata_del_dn the current REF DATA delay by v where v is in lt NR3 gt format and may be set in the range 0 02 ns to 4 00 ns Min Abbr rdata del u rdata del d Argument v lt NR3 gt 0 02E 9 to 4 00E 9 in 0 02E 9 steps Examples rdata del up 1 00E 9 rdata del dn 1 00E 9 8 60 GB700 User Manual Remote Commands rdata_delay v Reference Data Delay Sets the Analyzer REF DATA input delay to v where v may be set in the range 0 00 ns to 4 00 ns in 0 02 ns 20 ps steps v is expressed as a real number with an exponent of 9 Min Abbr rdata_dela Argument v 0 00E 9 to 4 00E 9 in steps of 0 02E 9 Example rdata_delay 1 10E 9 rdata_delay Reference Data Delay Query Returns the current Analyzer REF DATA input delay Min Abbr rdata_dela Returns lt NR3 gt Example rdata_delay command RDATA_DELAY 1 10E 9 response rdata_term neg_2v gnd ac pos_3v Reference Data Termination Sets the Analyzer REF DATA input termination Min Abbr rdata_te Arguments neg 2v 50 ohms to 2 volts gnd 50 ohms to ground ac 50 ohms via 0 01 uF capacitor to ground pos_3v 50 ohms to 3 volts Example rdata_term neg_2v rdata_term Reference Data Termination Query Returns a character string indicating the current Analyzer clock input termination setup Min Abbr rdata_te Returns neg 2v gnd ac pos 3v GB700 User Manual 8 61 Remote Commands Example rdata_term command R
109. data_thr_up increments threshold by 0 05 volts data_thr_dn decrements threshold by 0 05 volts data thr up v and data thr dn v Data Threshold Up Down This pair of commands increments data thr up or decrements data thr dn the current Analyzer DATA input threshold by an amount v Min Abbr data thr u data thr d Arguments v 0 05 to 6 00 Examples data_thr_up 0 10 increments threshold by 0 1 volt data_thr_dn 2 00 decrements threshold by 2 volts data_thres Data Threshold Sets the threshold voltage for the Analyzer DATA input to v where the allowed range for v depends on the current DATA input termination Min Abbr data_thre Arguments v 3 00 to 4 50 in steps of 0 05 see Table 5 5 for limits based on Termination Example data_thres 1 50 GB700 User Manual 8 59 Remote Commands data_thres Data Threshold Query Returns the current threshold voltage for the Analyzer DATA input Min Abbr data_thre Returns lt NR2 gt Example data_thres command DATA_THRES 1 50 response rdata_del_up and rdata_del_dn Reference Data Delay Up Down Default This command pair is used to increment rdata_del_up or decrement rdata_del_dn the current REF DATA delay by the default increment of 0 05 volts Min Abbr rdata_del_u rdata_del_d Arguments none Examples rdata_del_up rdata_del_dn rdata_del_up v and rdata_del_dn v Reference Data Delay Up Down This command pair is used to increment r
110. dd mmm yy hh mm ss th where yy year mmm month JAN FEB DEC dd day hh hours mm minutes ss seconds th tenths and hundreds of seconds Example res_start command RES_START 20 DEC 93 14 00 00 00 response res_stop Results Stop Time Returns a quoted string indicating the stop time of the previous test interval This command will produce a return if and only if previous results are available Previous results become available after TEST STATE has made at least one RUN to STOP transition Min Abbr res_sto Returns lt qstring gt lt qstring gt in the format dd mmm yy hh mm ss th where yy year mmm month JAN FEB DEC dd day hh hours mm minutes ss seconds th tenths and hundreds of seconds Example res_stop command RES STOP 20 DEC 93 14 30 00 00 response res_sync Results Synchronization Loss Seconds This command returns the number of seconds in which one or more pattern synchronization loss events occurred either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_sy Returns lt NR1 gt GB700 User Manual Remote Commands Example res_sync command RES_SYNC 23 response res_tes Results Threshold Errored Seconds This command returns the number of threshold errored seco
111. ded by a blank space that is no symbol Totalize results will be preceded by an infinity symbol Test results will be preceded by a T U or R depending on the selected test mode timed untimed or repeat Refer to Chapter 4 for more 2 8 GB700 User Manual GB700 User Manual BERT Basics and Feature Overview information on displaying Analyzer results and starting and stopping tests The bottom left section of the Analyzer display can show the following setup parameters delay in nanoseconds for the DATA or REF DATA input the selected input termination GND 2V 3V or FLT for the CLOCK DATA or REFERENCE DATA input or the selected word memory WORD 0 WORD 7 Note that DATA input delay may be set manually by the user or automatically by the AUTO SEARCH feature The bottom middle section of the display shows the currently selected Analyzer pattern for example PN23 indicates a 223 1 PRBS This section will also indicate when input pattern inversion is enabled by displaying INV after the pattern name The bottom right section of the Analyzer display shows the current value of the input threshold in volts for the CLOCK DATA or REF DATA inputs Note that the CLOCK and DATA input thresholds may be set manually by the user or automatically by the AUTO SEARCH feature 2 9 BERT Basics and Feature Overview Outputs and Inputs 2 10 This section introduces all inputs and outputs of the gigaBERT700 Generator and Ana
112. djusted However it is important to note that input threshold adjustment applies only for single ended operation When operating Analyzer clock or data inputs in the differential mode their input decision threshold effectively becomes the average of the positive peak and negative peak voltage levels and is not adjustable by the user Procedure to Adjust Single ended Input Decision Threshold 1 Verify that the selected input is set up for singled ended operation 2 Select either the DATA CLOCK or REF DATA input using the F2 and F3 keys 3 Press the THRESH key Verify that its LED turns on GB700 User Manual 5 11 Analyzer Functions 5 12 4 Press the input up down keys while observing selected threshold value in the bottom right field of the display Decision threshold setup range is a function of input termination as shown in Table 5 5 Table 5 5 Input Threshold Range as a Function of Termination Selected Termination Threshold Setup Range 2 00 to 4 00 VDC 50 mV steps 3 00 to 3 00 VDC 50 mV steps 1 50 to 4 50 VDC 50 mV steps 2 00 to 2 00 VDC 50 mV steps The displayed threshold takes effect immediately In other words threshold is incremented or decremented each time you press the up or down key Note that threshold is an AUTO SEARCH parameter So be sure turn off AUTO SEARCH if you want to fix delay at a specific value Logically Inverting Input Data The INPUT section INVERT key may be used t
113. e Error inhibit Rear panel ECL Error Output Real panel ECL Connectors SMA A 4 GB700 User Manual Specifications Auto_Search and Pattern Synchronization Auto Search When Auto_Search is on enabled the Analyzer automatically sets input Data Threshold input Data Delay relative to clock input signal input pattern PRBS or 8 16 bit word pattern and data polarity inverted or non inverted When Auto_Search is off disabled set up of these parameters is manual Pattern Synchronization Disable When Sync Disable is off the Analyzer will try to re synchronize the pattern detector when BER goes above the current synchronization threshold by looking for a new pattern frame alignment When Sync Disable is on this process is disabled Synchronization Thresholds PRBS patterns 25 1024 errors 4096 bits Word patterns 8 16 bit 3 1 128 errors 4096 bits Word patterns 128K option installed programmable See Table A 1 GB700 User Manual A 5 Specifications A 6 Synchronization Thresholds With 128K Option Installed Comer EMEN Measurements BER three simultaneous Totalize Window and Test displayed as 9 9E 01 to lt 1 0E 16 Total bit errors three simultaneous Totalize Window and Test displayed as 0 to 99999999 Totalize mode BER bit errors since last power on or clear Window mode BER bit errors over a sliding window Programmable in terms of time 1 sec 24 Hrs or bits 1 0E 8 to 1 0E 16 T
114. e These three methods are independent of each other and can operate simultaneously Window results are used to view current or real time performance Totalize results are generally used to view performance over long intervals Test results are used to measure error performance over specified time intervals Two results are calculated for all three methods OU BER U Bit Errors In addition Test results include the following network performance parameters and event counts Test seconds Total bits monitored Errored seconds Severely errored seconds Unavailable seconds Threshold errored seconds Error free seconds Degraded minutes Signal loss seconds Pattern Synchronization loss seconds Phase error seconds DODOCODCODCODUCHLU For explanations of these results see Result Definitions later in this chapter How TOTALIZE Results are Measured Totalize results are measured continuously by the Analyzer Totalize results can be cleared by the user by pressing the CLEAR key when Totalize results are displayed However Totalize result accumulation is a continuous background process of the Analyzer and cannot be suspended by the user The Totalize measurement process is illustrated in Figure 5 2 GB700 User Manual 5 15 Analyzer Functions Figure 5 2 The TOTALIZE Measurement Process CLEAR Untimed Measurement Interval gt TOTALIZE Process is continuous but results may be cleared by the o
115. e ias dide e bu iin A A 8 45 POS QI A NH e AE Un 8 46 pes dni peres ous ow REIR AINE NATI INN 8 46 A iiam dee une 8 46 pes efe pertes wm mex Nm aq dee 8 47 res elapsed uisus dee RE RN ERR a 8 47 POS GYPORB Ss op ptm t a dtt epit 8 47 ESOS d oov Mt a asin tan dri 8 48 Pes C8 OP ou cd opto pq seine a we ei toad aes 8 48 O m C tta Code ad ees 8 48 A ne ae tap sto berita estates o pina DI ac unes 8 49 O t Dent eL anc RT E 8 49 reS SeS ME da 8 49 A A A 8 50 res SLOT A e a e aiaa 8 50 VES ia RL 8 50 A o cal 8 51 Tes tes A A ed eU LEO 8 51 res tot Tate colinda reina 8 51 A O 8 52 res Us per onono oen a a cae mw Noa a A IS RT 8 52 rs echo lonl offl ia 8 27 DS BOBO A O 8 27 rs pmt lf onl off si at 8 27 A a a a a R A 8 28 rS prompt laa iia 8 28 PS KON ROI lon A o tuae arderet 8 28 A Aa A N E 8 29 save freg Mierer ea ae TAG 8 36 Save word Md 8 21 A A A TE 8 67 test CIS CAN A ee A ee aA S 8 69 test Tengtiv sod e Goo ene oi d ON BR ania in 8 69 test length rnein ennen easet mn ndn o NE 8 69 test mode untimed timed repeat oocoocccnococononanononanonnnoss 8 70 test mode oso wi ER nime eed 8 70 test prev current previous essere 8 70 test Drev oos eis eas eh aimed eve a 8 71 est 0 oa 0 5o A ed v pedro a 8 71 test report eot on_error both none s 8 71 test A dee oe dn E dit ee 8 72 8 10 GB700 User Manual Remote Commands test squelch lon tol i
116. e 8 82 UCI vol Ey E ae eei at ate t ete ei tenerte s da uas 8 82 audios vol so aeo e teo i tme Ae et 8 82 audio vol up and audio vol dn esses 8 82 audio vol up v and audio vol dn v 8 83 auto search auto off isa lic ari 8 64 E aac ien rds ofa tee Suv eset ee olet nit 8 64 byte block Tal Hobart 8 87 A A imo POM ud 8 87 byte delete a Blin rr e t ir rp m i t once 8 88 byte edit a bI soie oesceeie retro oo dox crise cere oec netos 8 88 byte edit a AA e anaes 8 88 byte_fill i b1 b2 Eia a 8 89 byte_insert a i b1 Tobal caia 8 89 byte Terieth m En innn a a 8 90 A A a n dette tind aoa aan ar 8 90 byte_sync n Analyzer only sese 8 90 byte sync Analyzer only 8 91 clock amp up and clock amp dn sse 8 37 clock amp up v and clock amp dn v 8 38 de A coc qr ra ish edle v HANE Na RU UNO Ed 8 38 GB700 User Manual 8 7 Remote Commands clock amplia 8 38 Clock red dda 8 33 A A Y 8 33 o ne oen ose Soins av vise a IN ACUTE 8 45 clock ainput smglelihtf o zoo e t hr rtr ro rS 8 54 clock INP UU S S O era drei d vari iu 8 54 clock memory m f iie Se eO ii 8 33 clock memory BL eve rre hr era opp o 8 34 clock off up and clock off dn esee 8 38 clock off up v and clock off dn v
117. e current long word synchronization threshold as explained in Table 5 2 Min Abbr byte s Returns lt NR1 gt Example byte_sync BYTE_SYNC 4 edit_begin n Edit Begin You must issue this command to the instrument before starting an editing session In effect this command loads the contents of a word memory location specified by n into a scratch pad memory location Once in the scratch pad memory it can be edited uploaded to the controller or saved to the same or a different memory location You also must issue the edit_begin command before downloading a word pattern to the instrument Min Abbr edit_b Arguments n NRI a decimal number in the range 1 to 7 where 1 indicates the current word pattern and 0 through 7 indicate a saved word pattern Example edit_begin 2 edit_cntrl Edit Control Query This command returns a character string that indicates whether or not a long word 128K Option editing session is in progress and if that session is under local or remote control Min Abbr edit_c Returns local remote none where local indicates a long word editing session is in progress under local front panel control GB700 User Manual 8 91 Remote Commands remote indicates a long word editing session is in progress under remote RS 232C or GPIB control none indicates that there is no long word editing session in progress Example edit_cntrl command EDIT_CNTRL NONE response edit_end n
118. e of the TEST menu 4 Select either VIEW CUR or VIEW PRE to view all current or previous Test results respectively Once inside either the VIEW CUR or VIEW PRE function use the pattern up down keys to scroll through the results list 5 When done press F1 multiple times to exit the menu system See Chapter 5 for more information on the TEST menu Also see Measurement Definitions later in this chapter 5 22 GB700 User Manual Analyzer Functions Printing Results Reports A serial or parallel printer may be connected to the Analyzer s RS 232 C or PRINTER ports respectively Note that you cannot connect a GPIB printer directly to the GPIB port but you may print results to a GPIB controller which can store reports for later viewing or printing Basic Report Setup Procedure The following initial setup procedure must be performed in order to generate any type of Analyzer report 1 Connect your printer to the Analyzer RS 232 or PRINTER ports as appropriate See Chapter 6 for details 2 Press Fl to enter the menu system 3 Select MORE F1 to view the second page of the main menu 4 Set up the appropriate hardware port as follows a Ifyou are using a serial printer select RS232 F2 to set up the serial port b If you are printing to a GPIB controller select GPIB F3 to set up the GPIB port M NOTE The Analyzer PRINTER port is a standard PC type parallel port which requires no hardware setup 5 Next se
119. ect lower level menus and finally the desired function In multi field functions use the F2 move left or F3 move right keys to select a field Note that the selected field is indicated by its flashing mode flashing selected not flashing not selected Once a field is selected use the pattern up down keys to increment or decrement the value of the selected field To exit any setup function press F4 to lock in all setup changes or F1 to escape without making any setup changes From any menu you can always exit the menu system by pressing F1 key one or more times until the normal display format appears 6 5 Menu Functions Menu Summaries The gigaBERT700 Generator and Analyzer menu system may be thought of as a top level or main menu plus a series of sub menus with each sub menu containing a group of related functions In this section you will find 1 A brief description of each menu found in the gigaBERT700 menu system Table 6 1 2 An overall view of the Analyzer menu system Table 6 2 3 An overall view of the Generator menu system Table 6 3 Note that all menu names in Tables 6 2 and 6 3 are shown in bold type and that all functions included only in instruments equipped with the 128K Option are marked with an asterisk Once you have reviewed the summary tables in this section please refer to the next section Menu Functions for a detailed description of each gigaBERT700 menu function Table 6 1
120. ectively See the remaining sections in this chapter for a brief explanation of each input output control and indicator shown in these figures See Chapters 3 4 and 5 for additional information and setup procedures using these controls and indicators GB700 User Manual BERT Basics and Feature Overview Figure 2 3 FREQUENCY MHz PANEL VIEW LOCK ANGLE E CLOCK FREQUENCY FREQUENCY 4 L y RECALL SAVE RECALL PATTERN SYNC O DATA INHIBITERROR INJECT INPUT OUTPUT n ECL GB700 User Manual CLOCK 4 O bows INTO 500 vno Generator Front and Rear Panels PATTERN OUTPUT PATTERN gigaBERT700 GENERATOR ERROR INJECT O RATE SINGLE E m OUTPUT SET CLOCK DATA ao Dee BAM OOD0D00000 OUTPUT CLOCK e AC LINE AMPLITUDE OFFSET o Ea OO A O 50 SOURCE IMP 2 0Vp p MAX INTO 509 LOAD GPIB IEEE STD 488 PORT SH1 AH1 T6 L4 SR1 RL1 PPO DC1 DTO CO E2 WARNING ELECTRICAL SHOCK HAZARD THIS INSTRUMENT MUST BE GROUNDED DO NOT OPEN INSTRUMENT REFER SERVICING TO QUALIFIED PERSONNEL DISCONNECT POWER CORD BEFORE REPLACING FUSE FOR CONTINUED FIRE PRODUCTION REPLACE ONLY WITH SPECIFIED FUSES VOLTAGE MAX FUSE 250V 5x20mm RANGE POWER UL 198 G IEC 127 90 132V 2A TIME DELAY 2AT 180 250V 1A TIME DELAY 1AT AUTOMATICALLY FREQUENCY 47 63Hz SELECTED 2 5 BERT Basics and Feature Overview Figure 2 4 Analyzer Front and Rear Panels p FREQUENCY MHz
121. ed with a value of 0 8 88 GB700 User Manual Remote Commands byte_fill i b1 b2 bn Byte Fill This command fills the entire edit pattern with a repeating i bit pattern b1 b2 b3 bn Min Abbr byte_f Arguments i NRI in the range 8 to 80 in steps of 8 indicates the number of bits in the fill pattern bl bn non decimal numeric s indicating the contents of the fill pattern Each byte may be in the range H00 to HFF hex Q000 to Q377 octal or B00000000 to B11111111 binary Example byte fill 16 HAA HFF byte insert a i b1 bn Byte Insert This command inserts a pattern of length i bits starting at address a in the edit pattern The insert pattern is indicated by bytes b1 Dn Min Abbr byte i Arguments a NRI in the range 0 to 16 383 the insert pattern will be inserted at this address i NRI in the range 8 to 80 in steps of 8 the number of bits to insert b1 bn non decimal numeric s Indicating the bytes that make up the insert pattern Each byte may be in the range H00 to HFF hex Q000 to Q377 octal or B00000000 to B11111111 binary Example byte_insert 1600 32 HFF HFF H00 H00 inserts the sequence FFFF0000 hex into the edit pattern at address 1600 and increments the edit pattern length by four bytes GB700 User Manual 8 89 Remote Commands byte length m n Byte Length This comman
122. equency setting Min Abbr clock_f Returns lt NR3 gt Example clock_freq command CLOCK_FREQ 0 150E 6 response clock_memory m f Clock Memory Sets the frequency saved at frequency memory location m to a specified value f in the range 150 kHz to 705 MHz Min Abbr clock_m Arguments m lt NR1 gt in the range 0 1 9 f lt NR3 gt in the range 0 150E 6 to 705 000E 6 Example clock_memory 9 100 000E 6 GB700 User Manual 8 33 Remote Commands clock_memory m Clock Memory Query Returns the frequency saved at frequency memory location m Min Abbr clock m Returns lt NR1 gt lt NR3 gt Example clock_memory 4 command CLOCK_MEMORY 4 100 000E 6 response clock source int ext Clock Source Sets the clock mode of the Generator to either internal int or external ext Min Abbr clock so Arguments int Selects the internal clock source ext Selects the external clock source Example clock source int clock source Clock Source Query Returns a character string indicating the current Generator clock mode Min Abbr clock so Returns int ext Example clock source command CLOCK SOURCE INT response clock step v Clock Step Sets the clock frequency increment decrement default step size to 1 kHz 10 kHz 100 kHz 1 MHz 10 MHz or 100 MHz Min Abbr clock ste Arguments v lt NR3 gt in the range 0 001E 6 0 010E 6 0 100E 6 1 000E 6 10 000E 6 or 100
123. er 2 Using the menu system Because it provides direct byte addressing this is often the best method for editing a few widely scattered bytes in long word patterns The menu system also provides the FILL function used to load a user specified 8 bit pattern into all bytes and the ORDER function used to set the bit order in each byte to MSB or LSB first Thus you can use the menu system to create long words with simple bit patterns using its byte fill order and editing capabilities 3 Downloading This is the best way to create long words with complex patterns Long word patterns may be created on an external controller using a text editor or specialized software and downloaded via the instrument s GPIB or RS 232 ports Downloading is the only practical way to create simulations of SONET SDH FDDI or other framed signals 3 12 GB700 User Manual Common Functions Creating Word Patterns Using Front Panel Controls Standard Instruments Use the following procedure to create word patterns using front panel controls in standard instruments that is Analyzers and Generators not equipped with the 128K Option 1 If you are using a previously saved pattern as the basis for the new pattern recall this pattern from memory See Recalling Word Patterns Press the WORD key The LED in the WORD key will turn on indicating that the instrument is in the word editing mode and the display will show the bit sequence of the current wor
124. eries while set commands may be referred to as simply commands Command Line Format Command Names Headers Every gigaBEHT700 command starts with a command header Headers are character strings that contain either an entire command name or a legal abbreviation of a command name Legal command name abbreviations must include the leading significant characters in the command name For example in the save word command only the first two letters are significant Therefore the save word command header may contain any of the following character strings save word save wor save wo save w save save sav sa The minimum abbreviation for each command name is identified in the Command Descriptions section later in this chapter The use of command abbreviations is often useful when you are operating a gigaBERT700 Generator or Analyzer manually from a terminal However when GB700 User Manual 8 3 Remote Commands including command names in control programs it is recommended that the full command names always be used as command headers This improves readability and reduces the chance that a control program will be incompatible with future versions of gigaBERT700 software which may include additional commands Command Line Rules The following rules summarize the basic syntax of gigaBERT700 commands Command Lines A given command line may contain one or multiple commands Ifa command line contains multiple commands commands w
125. est mode BER bit errors and other measurements over untimed timed 1 sec 24 Hrs or repeat intervals Additional Test Mode Measurements Includes ES EFS TES SES DM US and LOS See Chapter 5 Frequency Input clock frequency 10 kHz resolution History indicators Pattern Sync Loss Bit Error Phase Error Power Loss RS 232C and GPIB Interfaces Controlled functions all front panel functions except PANEL LOCK and POWER Read back functions all results and all settings except for PANEL LOCK GPIB terminator character LF line feed 0A hex GPIB address Front panel select 0 30 GB700 User Manual Specifications Printer Parallel Interface Format Parallel compatible with parallel LPT ports on ISA personal computers Reports Analyzer Settings End of Test On Error End of Window On Demand Test Summaries See Chapter 5 for details AC Power Requirements Voltage range 90 to 250 VAC auto ranging Frequency range 47 to 63 Hz Power 125 VA max Fuse rating 115 VAC 4 A or 230 VAC 2 A Operating temperature range 0 to 50 degrees C Mechanical Weight 10 Kg 22 lb Size 152H x 366W x 340D mm 6 x 14 4 x 13 4 Low Voltage Declaration EC Declaration of Conformity Compliance was demonstrated to the following specification as listed in the Official Journal of the Low Voltage European Communities EC Council Directive 89 336 EC Low Voltage Directive 73 23 EEC EN6101
126. etup and print a setup report on one of the controller s printers 7 2 GB700 User Manual Using Printers and External Controllers Using the RS 232C Port The following section describes how to set up and use the Generator or Analyzer RS 232C serial port Serial Interface Parameters gigaBERT700 serial port parameters are listed in Table 7 1 along with their available values and default value All of these parameters may be set up via the instrument s menu system In addition ECHO and XON XOFF can be changed remotely via the GPIB or RS 232C port Table 7 1 RS 232C Serial Port Parameters ECT AT EOL End of Line terminator CR ASCII decimal 13 LF ASCII decimal 10 CR LF or LF CR XON XOFF Flow control ON enabled or OFF disabled ON ON ECHO Echo back to the controller ON enabled or OFF disabled each character received by the Analyzer To set up the Analyzer RS 232C port use the following general procedure 1 2 3 4 GB700 User Manual Press the F1 key to enter the menu system Select MORE F1 Select the RS 232C menu F2 Set up BAUD PARITY SIZE EOL XON XOFF and ECHO as desired Once you have made and locked in your changes be sure to press F4 to exit each setup function exit the menu system by pressing the F1 key until the normal display format returns Using Printers and External Controllers Hardware Considerations The Analyzer and Generator RS 232C interface
127. eturned with a value of 0 GB700 User Manual 8 87 Remote Commands byte delete a i Byte Delete This command deletes i bits from the edit pattern starting with bit a Min Abbr byte d Arguments a NRI in the range 0 to 16 383 the block of bits to be deleted begins at this address i NRI in the range 8 to 80 in steps of 8 this is the number of bits to delete Example byte delete 512 80 byte edit a b1 Byte Edit This command is similar to byte block except that it can overwrite edit only one byte at a time The command overwrites 8 bits starting at address a Min Abbr byte e Arguments a NRI in the range 0 to 16383 the address of the overwrite byte b1 lt non decimal numeric gt indicates the overwrite byte pattern May be in the range H00 to HFF hex Q000 to Q377 octal or B00000000 to B11111111 binary Example byte_edit 1000 Q320 byte_edit a Byte Edit Query Returns the hex octal or binary representation of the 8 bit section of the edit pattern at address a Note that if there is no editing session in progress this command will return the indicated byte from the current word pattern Min Abbr byte_e Response a b1 in the format lt NR1 gt lt non decimal numeric gt Example byte_edit command BYTE_EDIT 500 H12 response M NOTE Ifthe returned byte is the last byte and if this byte contains one or more unused bits then these bits will be return
128. eturns most setup parameters to their factory default settings Appendix B However rst does not impact any of the following a DO0ODOOO the setup of the RS 232 or GPIB ports GPIB address calibration data the Standard Event Status Register SESR the Event Status Enable Register ESER the power on status clear flag setting stored frequencies or words Min Abbr rst Example rst sre n Service Request Enable This command sets the Service Request Enable SRER to the bit sequence corresponding to n where n is a decimal number in the range 0 to 255 Min Abbr sre Argument n 0 to 255 decimal Example sre 48 GB700 User Manual sets SRER to 00110000 binary 8 15 Remote Commands sre Service Request Enable Query This query command returns a decimal number in the range 0 to 255 corresponding to the contents of the Service Request Enable Register Min Abbr sre Returns lt NR1 gt where lt NR1 gt is a decimal number in the range 0 to 255 Example sre command 32 response Indicates that the SRE contains 00100000 binary stb Status Byte Query Returns a decimal number in the range 0 to 255 corresponding to the contents of the Status Byte Register SBR Min Abbr stb Returns lt NR1 gt where lt NR1 gt is a decimal number in the range 0 to 255 Example stb command 96 response 8 16 GB700 User Manual Remote Commands tst Self Test
129. ey Verify that its LED turns on 3 Press the input up down keys while observing the selected termination in the display Available terminations are GND 2V 3V and FLT The displayed termination becomes effective immediately In other words termination is changed each time you press the up or down key Low Frequency Effects of FLT Termination on Single ended Operation Because the single ended AC termination is AC coupled to ground input impedance will deviate from the nominal 50 ohm value at low frequencies As a practical matter for any PRBS pattern analyzed by the gigaBERT700 frequency effects will not be noticed until the peak energy frequency is less than about 10 MHz which for PRBS patterns will occur only when bit rate is less than about 20 Mb s However for word patterns with long strings of contiguous zeros effects may be noticed at higher bit rates Note from Figure 5 1 that when the AC termination is used with differential operation the input termination is not AC coupled Therefore the above low frequency limit on use of the AC termination does not apply when operating the CLOCK or DATA inputs in the differential mode Specifically when the Analyzer clock or data inputs are set up for differential operation the AC termination may be used over the entire bit rate operating range of the Analyzer Input Decision Threshold The input decision thresholds ofthe CLOCK DATA or REF DATA inputs can be independently a
130. f the current active pattern to the bit sequence represented by 307 octal recall_word 7 Recalls the word pattern saved in location 7 and makes it the current active pattern rs_prompt 700 Sets the terminal display prompt to 700 all_mem Returns the word patterns saved in all 10 word memory locations Returns the current display view angle setup word mem len 6 16 Sets the length of the word pattern stored in location 6 to 16 bits 8 6 GB700 User Manual Remote Commands Command Summary Alphabetical The following is a listing of all gigaBERT700 Generator and Analyzer commands and the page number of their full description A E E 8 12 uci pe OR E 8 12 un M 8 13 ule M 8 13 pin 8 13 pz X M P ees 8 14 po s EO RS 8 14 pudo C 8 14 uo PE O 8 15 PSS WA oo 8 15 o e e a e case al et UD 8 16 ull n 8 16 ac M 8 17 VAT o sn ond A A in erue E i A due 8 17 All MOH a fen aa lane eee OE NA 8 30 amplitude Mata ua 8 37 amplitude a aos 8 37 audio rat up and audio rat dn eee 8 81 audio rat up v and audio rat dn v 8 81 audio FACE Vh i eei retirer ne ee e puede eru D eds 8 81 AO PALE sue en eset E Sarah ee
131. f the new pattern is important be sure to save it before creating or recalling another pattern Creating Word Patterns Under Remote Control The third way to create word patterns is by remote control There are two sets of word editing commands word and byte Word commands also known as short word commands are part of the standard command set and are used to perform 8 and 16 bit editing functions Byte or long word commands which are added to the gigaBERT700 Generator or Analyzer command as part of the 128K Option are used to perform editing functions on words of any allowed length up to 16384 bytes Note that most word commands will function normally in instruments equipped with the 128K Option This allows instruments equipped with the 128K Option to operate in automated test applications designed around the 8 16 bit word command set However only byte commands may be used to edit long word GB700 User Manual Common Functions patterns that is words that are more than 16 bits long Therefore a gigaBERT700 Generator or Analyzer must be equipped with the 128K Option to function in automated test applications designed around the byte command set A general discussion of gigaBERT700 remote control functions and an explanation of each remote command may be found in Chapters 7 and 8 In addition the general procedure for using byte commands to create and edit word patterns is given below 1 All long word editing procedures mus
132. far in the current Totalize measurement interval Totalize BER equals the Totalize bit error count divided by the Totalize bit count Min Abbr Returns Example total_time total_r lt NR3 gt total_rate command TOTAL_RATE 8 62E 6 response Totalize Time Query Returns a quoted string indicating the amount of time accumulated in the current Totalize measurement interval Totalize time is zeroed at the start of each new Totalize measurement interval that is at power up and after each error reset Min Abbr Returns Example GB700 User Manual total_t lt qstring gt in the format ddd hh mm ss where ddd days hh hours 00 23 mm minutes 00 59 ss seconds 00 59 total_time command 000 12 34 56 response Remote Commands Input Setup Commands clock_input single diff Clock Input Selects either singled ended or differential operation for the clock input of the Analyzer Min Abbr clock_i Arguments single single ended operation diff differential operation Example clock_input single clock_input Clock Input Query Returns a character string indicating the current single ended differential setup of the Analyzer clock input Min Abbr clock_i Returns single diff Example clock_input command CLOCK_INPUT SINGLE response clock term neg 2v gnd aclpos 3v Clock Termination Sets the Analyzer clock input termination Min Abbr clock ter
133. fs_per Results Error Free Seconds This command returns the percentage of error free seconds calculated either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_efs_ Returns lt NR2 gt Example res_efs_per command RES_EFS_PER 100 00 response res_elapsed Results Elapsed Time This command returns a quoted string indicating the time elapsed either in the current interval so far or the previous interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_el Returns lt qstring gt in format ddd hh mm ss where ddd days hh hours mm minutes and ss seconds Example res_elapsed command RES_ELAPSED 000 23 52 30 response res_errors Results Errors This command returns the number of bit errors counted either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_er Returns lt NR1 gt Example res_errors command RES_ERRORS 81252873 response GB700 User Manual 8 47 Remote Commands res_es Results Errored Seconds This command returns the number of errored seconds
134. function and to make selections within each menu function See Chapter 5 for a detailed explanation each Generator and Analyzer menu function GB700 User Manual Functions Common to Generator and Analyzer D This chapter introduces gigaBERT700inputs outputs controls and indicators In addition it discusses setup and operation procedures that are common to the Analyzer and Generator GB700 User Manual 3 1 Common Functions AC Power The gigaBERT700 Generator and Analyzer are both AC powered The power connector of both instruments is located on their rear panel next to the main instrument fuse and a power ON OFF switch Both instruments have a second power switch labeled ON STBY on the front panel Normally leave the rear panel switch on and use the front panel switch to power and de power the instrument Selecting 115 VAC or 230 VAC Operation Both the gigaBERT700 Generator and Analyzer are equipped with an auto ranging AC power supply This supply will operate over a voltage range of 90 to 250 VAC and a frequency range of 47 to 63 Hz Thus no setup change is required to operate from 115 VAC at 60 Hz or 230 VAC at 50 Hz Fuse Replacement WARNING Never install the incorrect fuse Operating the gigaBERT700 Generator or Analyzer with an improper fuse creates a fire hazard The correct fuses to install in the gigaBERT700 Generator and Analyzer are shown in Table 3 1 Table 3 1 AC Power Fuse Types AC Power Vol
135. gnal and CLOCK is its corresponding clock signal DATA BAR and CLOCK BAR are complementary outputs to DATA and CLOCK respectively Thus the gigaBERT700 can drive single ended or differential inputs The amplitude and baseline offset of the CLOCK and DATA outputs are adjustable This insures compatibility with a wide range of input circuit designs The selected clock amplitude applies to both CLOCK and CLOCK BAR and the selected data amplitude applies to both DATA and DATA BAR Similarly the selected clock baseline offsets becomes the bottom negative peak voltage of both the CLOCK and CLOCK BAR outputs and the selected data baseline offset becomes the bottom voltage of the DATA and DATA BAR outputs The nominal waveform and phase relationship of the four output signals is shown in Figure 4 1 An equivalent circuit model for these four outputs is shown in Figure 4 2 GB700 User Manual 4 5 Generator Functions Figure 4 1 Nominal Generator Clock and Data Waveforms Showing Amplitude Baseline Offset and Vigp Vtop clock CLOCK CLOCK Amplitude CLOCK pk pk Bas eline Offset Same amplitud e CLOCK as CLOCK Same offset as CLOCK Vtop data DATA DATA DATA i Amplitude Bas eline pk pk Offset DATA Same amplitude Same offset asDATA as DATA Figure 4 2 Generator Clock and Data Output Equivalent Circuits Voch Out high voltage into an open circuit 50 Q 50 Q Vh logic high DATA or CLOCK Output Vhl l
136. gnized or is invalid EXE Execution Error Set to one when an error has occurred while the instrument was responding to a set command or query May indicate a parameter is out of range a command uses too many or too few parameters or a command cannot be properly executed due to the instrument s current state DDE Device Dependent Error Set to one if input data has been lost at the interface corrupted characters or the input buffer has overflowed because a command exceeded the 80 character limit without a terminator QYE Query Error Set to one if a an attempt has been made to query the output queue when there are no messages available or pending b a command is received but the output queue is not empty or c an attempt has been made to query the output queue when an unterminated command is in the input queue RQC Request Control Not used OPC Operation Complete Set to one after a OPC command is received Event Status Enable Register The Event Status Enable Register ESER is the enable register associated with the SESR status register Each enable bit in the ESER occupies the same bit position as the corresponding status bit in the SESR See Figure 7 1 above 7 16 GB700 User Manual Using Printers and External Controllers Test Status Register The Test Status Register TSR which is found in the Analyzer only indicates the completion of measurement intervals or the occurrence of various error events
137. gt Example data_delay command DATA_DELAY 1 62E 9 response GB700 User Manual 8 57 Remote Commands data_input single diff Data Input Selects either singled ended or differential operation for the Analyzer data input Min Abbr data_inp Arguments single single ended operation diff differential operation Example data_input single data_input Data Input Query Returns a character string indicating the current single ended differential setup of the Analyzer data input Min Abbr data_inp Returns SINGLE DIFF Example data_input command DATA_INPUT DIFF response data_term neg_2v gnd ac pos_3v Data Termination Sets the Analyzer data input termination Min Abbr data_te Arguments neg 2v 50 ohms to 2 volts gnd 50 ohms to ground ac 50 ohms via 0 01 uF capacitor to ground pos 3v 50 ohms to 3 volts Example data_term ac data_term Data Termination Query Returns a character string indicating the current Analyzer data input termination setup Min Abbr data_te Returns neg 2v gnd ac pos 3v Example data term command DATA TERM AC response 8 58 GB700 User Manual Remote Commands data_thr_up and data_thr_dn Data Threshold Up Down Default This pair of commands increments data_thr_up or decrements data_thr_dn the current Analyzer DATA input threshold by the default increment of 0 05 volts Min Abbr data_thr_u data_thr_d Arguments none Examples
138. h auto off disab Auto_Search Enables or disables the Auto Search and Automatic pattern re alignment functions Min Abbr auto_s Arguments auto Auto Search on pattern re alignment enabled off Auto Search off pattern re alignment enabled disab Auto Search off pattern re alignment disabled Example auto_search auto auto_search Auto_Search Query Returns a character string representing the current setup of AUTO SEARCH and automatic pattern re alignment Min Abbr auto_s Returns auto off disable Example auto_search command AUTO_SEARCH AUTO response disp_select total window test Display Select Selects the total window or test display mode The display mode determines which BER and bit error results are shown in the top middle and top right fields respectively of the display Min Abbr dis Arguments total selects the Totalize display mode window selects the Window display mode test selects the Test display mode Example disp_select test 8 64 GB700 User Manual disp_select Remote Commands Display Select Query Returns a character string that indicates the current display mode of the Analyzer Min Abbr Returns Example error_reset dis total window test command response disp_select DISP_SELECT TEST Error Reset This command resets the Totalize and Window measurement processes This does not affect Test results Min Abbr Arguments Examp
139. he 128K Option the gigaBERT700 Generator and Analyzer can store up to eight long word patterns each containing up to 128 kbits You may also use the RECALL key to recall patterns from ROM including the mark density patterns which are provided as part of the 128K Option O WORD LENGTH Press this key and then the up down keys to adjust the length of the current word pattern O T L These are the pattern up down keys Their effect depends on which of the above pattern keys has been selected Ol MSB 1 to LSB 8 Use these keys to edit the displayed byte in the current word pattern Each key will toggle one bit in the displayed byte Ol CLEAR Pressing this key forces all bits in the displayed byte to 0 O SET Pressing this key forces all bits in the displayed byte to 1 Function Soft Keys F1 F2 F3 and F4 Menu Functions The primary use of the function keys in the Generator and Analyzer is to access and navigate each instrument s menu system F1 may be thought of as the main menu key Pressing F1 will GB700 User Manual 2 17 BERT Basics and Feature Overview display the instrument s first level menu Once inside the menu system you may use the F1 F2 F3 and F4 keys to select different menus or to make choices within a selected menu Note that pressing the F1 key enough times will always get you out of the system See Chapter 5 for an explanation of each Generator and Analyzer menu Analyzer INPUT Selection Function When
140. he ERROR HISTORY section lights and that the displayed error total increases by one each time you press the SINGLE key Press this key at least 20 times Note Press the SINGLE key briefly If you hold it down the Generator injects errors repeatedly into the data stream a a a a O DC Step 31 In the ERROR HISTORY section press the CLEAR key to clear the history LEDs Step 32 In Generator ERROR INJECTION section press the RATE key ERR 1E 7 will appear on the display The ERROR INJECTION LED should be on steadily Step 33 In the Generator ERROR DETECTION section press the CLEAR key to clear the totalize error display Step 34 Wait 15 seconds then confirm that the error rate displayed on the Analyzer matches the Generator injected error rate and that the Analyzer BIT LED in the ERROR HISTORY section is lighted Step 35 In the Generator ERROR INJECTION section press the RATE key once to select the next error rate Q Step 36 Repeat steps 33 through 35 until all Generator error rates have been verified and EXT appears on the Generator display Press the Generator ERROR RATE key once more to turn off error injection Step 37 Look straight at the Generator LCD panel Depress the VIEW ANGLE button until you see the darkest digits Change the vertical angle from which you view the display and adjust the clarity by depressing the VIEW ANGLE adjust button This is to verify that the cont
141. he RATE key is on the instrument is either generating an error rate internally or under external error generation control You can determine which by observing the bottom middle field of the display If an error rate is displayed e g ERR 1E 09 then the Generator is in the internal error inject mode Ifthe message EXT ERR is displayed then the external error inject mode has been selected indicating that the signal appearing at the rear panel EXTERNAL ERROR INJECT input will control error injection rate One error will be generated for each negative to positive transition in this signal In all other error inject modes the signal appearing at this input will be ignored NOTE In all error injection modes the ERROR LED will flash each time an error is injected Procedure to Control Error Injection Mode 1 Press the RATE key one or more times to select the desired error injection mode Note that the LED in the RATE key will turn on except when mode is setto ERR OFF Available selections are QO ERR OFF Single inject mode GB700 User Manual Generator Functions ERR 1E Internal rate of 1077 ERR 1E 6 Internal rate of 10 6 ERR 1E 9 Internal rate of 10 9 ERR 1E 4 Internal rate of 10 4 ERR 1E Internal rate of 1073 ERR EXT External error inject mode 2 Once you have selected an internal error rate or the external mode you can turn this error rate off and on by alternately pressing the SINGLE key and RATE key Do no
142. he SYNC menu as follows Procedure to Set SYNC Threshold Press the F1 key to enter the menu system Press F4 MORE two times Press F2 SYNC Use the pattern up down keys to select a synchronization threshold level from 1 to 9 e ONE When done press F4 to enter your choice 6 Press F1 multiple times until you have exited the menu system V NOTE See Chapter 5 for a further explanation of the SYNC menu 5 6 GB700 User Manual Analyzer Functions Clock Data and Reference Data Inputs This section explains how to set up Analyzer clock data and reference data inputs using front panel controls and menus Overview The Analyzer CLOCK DATA and REF DATA inputs are designed to accommodate a wide range of output logic levels and circuit designs An equivalent circuit diagram of the Analyzer input section is shown in Figure 5 1 Figure 5 1 Analyzer Clock and Data Input Equivalent Circuits Voch Out high voltage into an open circuit 50 Q 50 Q Vh logic high DATA or CLOCK Output Vhl logic low DATA or CLOCK Output Vocamp 50 Negative Supply Input Parameters The following input parameters may be set manually by the user or automatically by the AUTO SEARCH function A Decision threshold CLOCK DATA and REF DATA A Delay DATA and REF DATA A Inverted or non inverted data DATA In addition there are two parameters that can be selected only by the user QO Termination CLOCK DATA and R
143. he WORD key again 3 18 GB700 User Manual Generator Functions 7 This section defines key functions of the gigaBERT700 Generator and how to set up these functions using front panel controls GB700 User Manual 4 1 Generator Functions Clock Source and Frequency The Generator can operate using its internal clock or an external clock source The CLOCK section of the Generator front panel is used to select clock mode internal or external set internal clock frequency and store or recall user defined frequencies In addition the CLOCK section contains an input for an external clock source When using the internal clock you may set frequency directly or recall one of 10 previously saved frequencies from memory The frequency save recall feature is especially useful if you often switch back and forth between a limited number of different frequencies The External Clock Input When the Generator is in external clock mode a clock source must be connected to the connector labeled INPUT in the CLOCK section of the Generator s front panel The operating bit rate of the Generator will then be determined by the frequency of this source However when the Generator is set to internal clock mode any signal applied to this input will be ignored The External Clock Input will accept clock signals with frequencies from 150 kHz to 700 MHz The signal does not have to be continuous that is it may contain periods of inactivity However t
144. he bit sequence corresponding to n where n is a decimal number in the range 0 to 255 Min Abbr ese Argument n 0 to 255 decimal Example ese 255 sets the ESER to 11111111 binary GB700 User Manual Remote Commands ese Event Status Enable Query Returns a decimal number in the range 0 to 255 corresponding to the contents of the Event Status Enable Register ESER Min Abbr ege Returns lt NR1 gt where lt NR1 gt is a decimal number from 0 to 255 Example ese command 255 response esr Event Status Register Query Returns a decimal number in the range 0 to 255 corresponding to the contents of the Standard Event Status Register SESR Min Abbr esr Returns lt NR1 gt where lt NR1 gt is a decimal number in the range 0 to 255 Example esr command 213 response idn Identify Query Returns the gigaBERT700 Generator or Analyzer identification including company name BERT model number Generator or Analyzer identifier and software version number Min Abbr idn Returns TEKTRONIX BERT 700 RX TX 0 Vs ss where RX indicates Analyzer TX indicates Generator Vs ss software version number e g V3 00 Example idn command TEKTRONIX BERT 700 RX 0 V3 00 response GB700 User Manual 8 13 Remote Commands 8 14 Irn opc Learn Query Returns a character string listing the instrument s current setup except for C information on the remote ports
145. he signal must start and end with a complete clock cycle that is a negative to positive and a positive to negative transition pair A non continuous clock is also called a BURST clock External Clock Input Termination The termination of the external clock input may be set to 2 V or ground as follows Procedure Press the F1 key to enter the Generator menu system Press F1 MORE Press F2 CLOCK Use the up down keys in the PATTERN section to select one of the following a GND ground b 2V 5 Press F4 to set or F1 to exit without change kwon bP 6 Press F1 to exit the menu system GB700 User Manual Generator Functions The input switching threshold of the external clock input depends on the selected termination as shown in Table 4 1 Table 4 1 External Clock Input Specifications vs Termination Termination Switching Threshold Amplitude Range 50 Q to ground Ground 50 mV 500 mV to 2 V peak to peak centered on ground 50 Q to 2 V 1 3 V 50 mV 500 mV to 1 4 V peak to peak centered on 1 3 V These pk pk amplitude limits are based on the requirement that signals applied to the external clock input must cross the decision threshold by at least 200 mV but at the same time not exceed overall limits of 2 V to 2 VDC Clock Source Generator clock source may be set to internal or external using the EXT key in the CLOCK section When the LED in the EXT key is off then clock source is internal
146. hile a test is stopped all current Test results are frozen When the CLEAR key is pressed to start a new test all current Test results are saved as previous Test results before current result registers are cleared As shown in Figure 5 4 Test results may be calculated using one of three timing modes Timed Untimed or Repeat GB700 User Manual 5 17 Analyzer Functions Figure 5 4 The TEST Measurement Process TEST MeasurementProcess Untimed Untimed TEST Process Measurement Interval Intervals started and stopped manually by operator TEST interval T set in terms of time hrs min sec in TEST menu CLEAR CLEAR CLEAR Timed TEST Process Intervals started by E T T T operator stopped auto matically at end of interval T CLEAR RepeatTimed TEST Process Process started by operator intervals oflength T stopped and re started automatically Timed Tests When the Timed mode is selected the Analyzer will automatically stop accumulating Test results after the test interval specified by the user has elapsed All Test results will be frozen until the CLEAR key is pressed to begin a new test Repeat Timed Tests When the Repeat mode is selected the Analyzer will automatically stop and then restart a test after a user specified test length has elapsed This process will continue until the user presses the CLEAR key to manually stop Test result accumulation Untimed Tests When the Untimed mode is se
147. hown in the Termination Threshold Limits table GB700 User Manual Customer Acceptance Test e Press F2 on the Analyzer to select CLOCK inputs and confirm that the F2 LED is lighted and repeat steps a through d Note The threshold limits listed assume that the Generator is set to default Amplitude and Baseline Offset Analyzer Termination Threshold Limits Analyzer Termination Analyzer Threshold Limits l 50 ohm to 3 V 1 5 V 100 mV Confirmation of Differential Operation L Step 43 Set the Generator and Analyzer to Factory Default Settings CL Step 44 Push the Analyzer DIFF button and confirm that the LED lights Q Step 45 Push the Analyzer F2 button and then the DIFF button Verify that the Analyzer LOCK light illuminates GB700 User Manual D 7 Customer Acceptance Test Confirmation of Buttons and Indicators O Step 46 Reset both the Generator and Analyzer by cycling the power Q Step 47 Verify the following Generator LEDs Section TON CLOCK FREQUENCY RECALL SAVE EXT PATTERN PRBS WORD RECALL SAVE WORD LENGTH F1 F4 Bits 1 8 Ree i DATA CLOCK INVERT DATA Lmoemee ron Left Side PANEL LOCK GPIB ADDR LOCAL O Step 48 Verify the Generator LEDs and buttons operate by toggling the following buttons and observing the LEDs turn ON and OFF Section LED Button Indicator Left Side PANEL LOCK ON OFF GPIB ADDR ON OFF O Step 49 Verify the Analyzer LEDs and buttons operate by togg
148. igital Converter A device that converts an analog signal that is a signal in the form of a continuously variable voltage or current to a digital signal in the form of bits Attenuation A decrease in magnitude of current voltage or power of a signal in transmission between points Attenuator An electronic transducer either fixed or adjustable that reduces the amplitude of a wave without causing significant distortion Band width The difference between the limiting frequencies of a continuous frequency spectrum The range of frequencies handled by a device or system BER An acronym for Bit Error Ratio or Rate The principal measure of quality of a digital transmission system BER is defined as BER Number of Errors Total Number of Bits BER is usually expressed as negative exponent For example a BER of 10 means that 1 bit out of 10 bits is in error BER Floor A limiting of the bit error ratio BER in a digital fiber optic system as a function of received power due to the presence of signal degradation mechanisms or noise Binary A numbering system that allows only two values zero and one 0 and 1 Binary 1s the way most computers store information in combination of ones and zeros Voltage on Voltage off See also Bit Bit A binary digit the smallest element of information in binary system A 1 or 0 of binary data Bit Error An incorrect bit Also known as a coding violation F 1
149. ii Getting Started A A 1 1 Scope of this user manual eene eene enne 1 2 Initial Self Check Procedure sssseeeee eses es eses eses eses 1 3 BERT Basics and Features sssssssssssscsssscsssssscceesscsssscessscceeeessssssssosesseee 2 1 BERT Basics see trie reri ee tree terne ee Ee eee Phe e codo 2 2 Front amp Rear Panel Figures esee eene 2 4 Display Formats edere hurt ere eldest eR REP uen 2 8 Outputs amp A terree entro ne tete e eene Rake Vae eo eae 2 10 Generator OUTPUT cidos eee pee tare eene ne he pee eee gendo ais 2 10 Generator LOCK eder Wied ae ate eae 2 11 Generator Rear Pan l j it a eee eere edes 2 11 Analyzer INPUT caca E CERE ERE en ered tae 2 11 Analyzer MONITOR vecino eneen iaeaea 2 12 Analyzer Rear Panel eee rettet rene heit enn 2 12 Connectors Terminations and Levels ooorcccnccnnnncncnononononononos 2 14 Controls amp INdiCatoTS cocooonoconnncconnnononocnnoncnnnnnnnononononcnnonnnnononononccccnnnns 2 16 Powet Switches iaa 2 16 View Angle and Panel Lock Keys oooooooocccccccccococonaconcnccnoncnnananononons 2 16 GPIB Controls 2 ts E rette e er e ETT Ree 2 16 Pattern Controls and Function Keys eere 2 17 Generator CLOCK 4 2 5 ticas 2 18 Generator OUTPUT iit RE e ee e 2 18 Generator ERROR INJECT sssseseee eene 2 19 Analyzer INPUT erret odio 2 19 Analyzer ERROR DETECTION eere 2 20
150. imentary outputs to DATA and CLOCK respectively Therefore to drive a single ended clock or data input simply connect appropriate true output CLOCK or DATA while terminating its compliment CLOCK BAR or DATA BAR with 50 ohms to ground Or to drive a differential clock or data input connect the appropriate true output CLOCK or DATA to the non inverting input and the complimentary output CLOCK BAR or DATA BAR to the inverting input No other setup is required to configure the Generator for singled ended or differential operation Procedure for Single ended Operation 1 For singled ended operation connect Generator CLOCK and DATA outputs to singled ended inputs on the DUT GB700 User Manual Generator Functions 2 Terminate the CLOCK BAR and DATA BAR outputs with 50 ohms to ground GB700 User Manual 4 9 Generator Functions Procedure for Differential Operation 1 Connect CLOCK and CLOCK BAR outputs of the Generator to the true and complimentary clock inputs on the DUT 2 Connect DATA and DATA BAR outputs of the Generator to the true and complimentary data inputs on the DUT 4 10 GB700 User Manual Generator Functions PSYNC and CLOCK 4 Outputs The OUTPUT section of the Generator front panel contains two additional outputs that may be useful when observing the Generator output with an oscilloscope The first is the PSYNC or pattern sync output which generates one pulse per pattern frame This signal may be use
151. in instruments also equipped with the 128K Option 3 10 GB700 User Manual Common Functions Use the following procedure to select recall a word mark density or a PROM pattern 1 Press the RECALL key 2 Press the pattern up down keys until the desired word or desired mark density pattern is displayed Available selections are A WORD 0 CQ WORD 1 WORD 7 MRK 1 8 MRK 1 4 MRK 1 2 MRK 3 4 MRK 7 8 PO P1 DOODODODOODOO a P9 The displayed word mark density or PROM pattern becomes the active pattern immediately GB700 User Manual 3 11 Common Functions Word Patterns This section explains how to create edit save and recall word patterns using front panel controls or the menu system Basics You may create and save up to eight word patterns in battery backed memory locations WORD 0 through WORD 7 In addition the current word pattern is stored in battery backed memory In standard units each of the saved words and the current word can contain up to 16 bits In Generators and Analyzers equipped with the 128K Option which provides additional battery backed memory each of the saved words and the current word can contain up to 128 kbits There are three ways to create gigaBERT700 word patterns 1 Using front panel controls This is usually the quickest way to create and edit short patterns It also can be a practical way to edit a few bytes in long patterns if these bytes are located near to each oth
152. ing the audio rate threshold from 1 x 103 to 1 x 10 12 audio rate v Audio Rate Sets the BER threshold for the error beeper to 1 x 10 V Min Abbr audio rate Arguments v 2 8 14 Example audio rate 9 GB700 User Manual 8 81 Remote Commands audio_rate Audio Rate Query Returns the current error beeper BER threshold Returns lt NR1 gt Example audio_rate command AUDIO_RATE 9 response audio vol v Audio Volume Sets the volume of the error beeper to v where v can range from 0 off to 4 maximum volume Min Abbr audio vol Arguments v 0 1 2 3 or 4 Example audio_vol 4 audio_vol Audio Volume Query Returns a decimal number in the range 0 1 2 3 or 4 that represents the current error beeper Min Abbr audio_vol Returns lt NR1 gt Example audio_vol command AUDIO_VOL 4 response audio_vol_up and audio_vol_dn Audio Volume Up Down Default This command pair is used to increment audio_vol_up or decrement audio_vol_dn the current error beeper volume by one level Min Abbr audio_vol_u audio vol d Argument none Example audio vol up audio vol dn 8 82 GB700 User Manual Remote Commands audio_vol_up v and audio vol dn v Audio Volume Up Down This command pair is used to increment audio vol up or decrement audio vol dn the current error beeper mow volume by v levels Min Abbr audio_vol_u audio_vol_d Argument V lt NR1 gt 1 2 3 or 4
153. ion 5 32 Automatic Setup Functions SYNC 5 2 Clock Data and Reference Data Inputs 5 7 Error Detection Set up 5 14 Error History Indicators 5 31 Monitor Outputs 5 13 Printing Results Reports 5 22 Result Definitions 5 28 Controls amp Indicators 2 16 Analyzer ERROR DETECTION 2 20 Analyzer INPUT 2 19 Analyzer SYNC Controls 2 20 Generator CLOCK 2 18 Generator ERROR INJECT 2 19 Generator OUTPUT 2 18 GPIB Controls 2 16 Pattern Controls and Function Keys 2 17 Power Switches 2 16 View Angle and Panel Lock Keys 2 16 Starting amp Stopping Measurements 5 34 Synchronization LOCK Threshold 5 6 Viewing Results 5 21 Customer Acceptance Test D 1 D Default Settings B 1 Display Formats 2 8 B BERT Basics 2 2 C Cleaning Instructions E 1 Common Functions 3 1 AC Power 3 2 LCD Viewing Angle 3 4 Locking the Front Panel 3 6 Pattern Definitions 3 7 Recalling Default Setup 3 5 Selecting Recalling a Saved Word Mark Density or PROM Pattern 3 9 Selecting a Pattern 3 7 Selecting an Active Pattern 3 7 GB700 User Manual Index F Figures Analyzer Clock and Data Input Equivalent Circuits 5 7 Analyzer Display 2 8 Analyzer Front amp Rear Panels 2 6 Analyzer Setup Report Example 5 23 BERT Application Example 2 2 End of Test Report Example 5 24 End of Window Reports Example 5 25 Generator Clock and Data Output Equivalent Circuits 4 6 Ge
154. irements Voltage range 90 to 250 VAC auto ranging Frequency range 47 to 63 Hz Power 125 VA max Fuse rating 115 VAC 2 A or 230 VAC 1 A Operating temperature range 0 to 50 degrees C Mechanical Weight 10 Kg 22 lb Size 152H x 366W x 340D mm 6 x 14 4 x 13 4 GB700 User Manual A 3 Specifications Analyzer Specifications Clock Inputs Format Differential or single ended Frequency range 150 kHz to 705 MHz Input level 500 mV to 6 0 V p p Input threshold variable 3 00 V to 4 50 V in 50 mV steps Impedance 50 ohms Termination voltage selectable GND 2 V 3 V or AC Data Inputs Format NRZ L true or inverted differential or single ended Input threshold variable 3 0 V to 4 5 V in 50 mV steps Input amplitude 500 mV to 6 0 V p p Termination voltage selectable GND 2 V 3 V or AC Impedance 50 ohms Delay relative to clock variable 0 to 4 00 ns in 20 ps steps Connectors SMA Reference Data Input Format NRZ L true Input threshold variable 2 0 V to 1 0 V in 50 mV steps Input amplitude 500 mV to 6 0 V p p Termination voltage selectable GND 2 V 3 V or AC Impedance 50 ohms Delay relative to clock variable 0 to 4 00 ns in 20 ps steps Connector SMA Auxiliary Monitor Outputs Data Clock and PSYNC Amplitude 250 mV p p into 50 ohms 500 mV into a high impedance Output impedance 50 ohms Data monitor Latched input data Clock monitor Buffered input clock Pattern sync 1 bit wide pulse per fram
155. is disabled that is forced LOW GB700 User Manual Analyzer Functions This chapter explains how to enable or disable Analyzer automatic synchronization functions It further shows how to manually set Analyzer input parameters and error detection functions and how to start tests view results and print results The chapter also defines all results calculated by the Analyzer GB700 User Manual 5 1 Analyzer Functions Automatic Setup Functions SYNC 5 2 This section explains how to use the following SYNC controls and indicator in the ERROR DETECTION section QO AUTO SEARCH key A DISABLE key LY LOCK indicator Overview AUTO SEARCH Key The AUTO SEARCH key is used to enable or disable the auto search feature When auto search is enabled the Analyzer will automatically attempt to set the following parameters each time pattern synchronization is lost 1 clock and data input threshold data input delay PRBS pattern pattern polarity and af OD pattern alignment In addition auto search will clear turn off the BIT and PHASE history indicators once pattern sync is regained Thus AUTO SEARCH can greatly simplify Analyzer setup and operation especially when the input clock and data phase relationship and amplitudes are not known DISABLE Key The DISABLE key is used to disable automatic pattern realignment When automatic pattern realignment is enabled DISABLE off the Analyzer will attempt to
156. k_amp_dn GB700 User Manual 8 37 Remote Commands clock_amp_up v and clock_amp_dn v Clock Amplitude Up Down This command pair is used to increment or decrement the current clock amplitude by specified amount of v volts Min Abbr clock_amp_u clock_amp_d Arguments v lt NR2 gt in range 0 05 to 1 50 in steps of 0 05 Example clock_amp_up 0 05 clock_amp_dn 0 05 clock_ampl v Clock Amplitude This command sets the output clock amplitude to v volts Min Abbr clock_ampl Arguments v lt NR2 gt in the range 0 50 to 2 00 in steps of 0 05 Example clock_amplitude 2 00 clock_ampl Clock Amplitude Query Returns the current clock amplitude setting Min Abbr clock_ampl Response lt NR2 gt Example clock_ampl command CLOCK_AMPL 1 40 clock_off_up and clock_off_dn Clock Offset Up Clock Offset Down Default This command pair is used to increment or decrement the current output clock signal baseline offset by a default value of 0 05 volts Min Abbr clock_off_u clock_off_d Arguments none 8 38 GB700 User Manual Remote Commands Examples clock_off_up clock_off_dn clock_off_up v and clock_off_dn v Clock Offset Up Clock Offset Down This command pair is used to increment or decrement the current output clock signal baseline offset by a specified amount v volts Min Abbr clock_off_u clock_off_d Arguments v lt NR2 gt in the range 0 05 to 3 80 Example clock_off up 0 10
157. l the Totalize Mode results are displayed infinity character in front of the BER result 2 Press the CLEAR key in the ERROR DETECTION section to clear Totalize BER and Bit Error results Totalize Process Set Up The Totalize measurement process is active all the time and requires no explicit setup by the operator GB700 User Manual 5 19 Analyzer Functions Window Process Set Up The Window measurement process may be configured using the four parameters in the WINDOW menu QO MODE Defines window length in terms of bits or seconds C BITS Window length in bits QO SECOND Window length in terms of hours minutes and seconds C REPORT Turns end of window reports on or off If you want to measure Window results you must set the MODE parameter and depending on your MODE selection either the BITS or SECOND parameter In addition if you want to generate end of window reports you must also set the REPORT parameter to on Procedure 1 Press F1 to enter the menu system 2 Select the WINDOW menu F3 3 Within the WINDOW menu set up a MODE F2 and b either BITS F3 or SECOND F4 4 Press MORE F1 to see the next page of the WINDOW menu 5 If you are using a printer set the REPORT parameter F2 to on or off as required 6 When WINDOW menu setup is complete press F1 multiple times to exit the menu system See Chapter 5 for more information on setting up the WINDOW menu Test Process Set Up The TEST
158. le histry_bits er none error_reset History Bits Query Returns a character string indicating the state of the BIT error history indicator Min Abbr Returns Example histry_clear histry_b on off histry_bits command HISTRY_BITS OFF response History Clear This command clears resets all four Analyzer history LEDs Sync Loss Bit Error Phase Error and Power Loss Min Abbr Arguments Example GB700 User Manual histry_c none histry_clear 8 65 Remote Commands histry_phase History Phase Returns a character string indicating the state of the PHASE error history indicator Min Abbr histry_ph Returns on off Example histry_phase command HISTRY_PHASE ON response histry_power History Power Returns a character string indicating the state of the POWER Loss history indicator Min Abbr histry_po Returns on off Example histry_power command HISTORY_POWER OFF response histry_stat History Status Query This command returns a summary of the Analyzer s front panel status The response will be in the form of multiple message units separated by semicolons Min Abbr histry_st Returns Window error rate lt NR3 gt Totalize error rate lt NR3 gt Received clock frequency lt NR3 gt Sync Lock status on off History status indicators on off Example histry stat command WIN RATE 1 5E 03 response TOTAL RATE 3 7E 06 CLOCK FREQ 701 47E 6
159. le data_pattern command DATA_PATTERN PRBS response prbs_length v PRBS Length Selects the current PRBS pattern which becomes the current active pattern if and only if pattern mode is set to PRBS see data_pattern command The argument v may be set to 7 15 17 20 or 23 corresponding to the five PRBS patterns that can be transmitted by the Generator and Analyzed by the Analyzer Min Abbr prb Arguments 7 Selects the PRBS with a length of 27 1 bits 15 Selects the PRBS with a length of 219 1 bits 17 Selects the PRBS with a length of 217 1 bits 20 Selects the PRBS with a length of 220 1 bits 23 Selects the PRBS with a length of 223 1 bits Example prbs_length 23 prbs_length PRBS Length Query Returns an integer n where 20 1 is the length of the current prbs pattern Min Abbr prb Returns lt NR1 gt which may equal 7 15 17 20 or 23 Example prbs_length command PRBS_LENGTH 23 response 8 20 GB700 User Manual Remote Commands recall_word m Recall Word Causes the instrument to recall the word pattern saved at location m and make this pattern the current word pattern and the active pattern Min Abbr recall_w Arguments m 0 1 9 0 7 for 128k option Example recall_word 5 save_word m Save Word Causes the instrument to save the current word pattern to word memory location m Min Abbr save_w Arguments m 0 1 9 0 7 for 128k option Example save_w
160. lect the PRINT parameter F4 a Set the PORT parameter to Parallel GPIB or Serial b Set the ON OFF parameter to ON to enable reports V NOTE The PRINT ON OFF parameter must be set to ON to print any type of report 6 When you have completed all desired setup changes press F1 multiple times to exit the menu system Analyzer Setup Report Press the F4 key at any time to print an immediate report listing the current setup of the Analyzer This function is not available while the Analyzer is in the menu mode An example Setup Report is shown in Figure 5 5 GB700 User Manual 5 23 Analyzer Functions Figure 5 5 Example Analyzer Setup Report 5 24 Tektronix Inc GB 700 Jun 14 92 02 14 29 AUTO_SET AUTO DATA_DELAY 1 800E 9 DATA_THRES 0 05 RDATA_DELAY 0 000E 9 RDATA_THRES 1 50 DATA_TERM GND CLOCK_TERM GND RDATA_TERM GND TEST_LENGTH 00 00 30 TEST_MODE TIMED TEST_PREV PRE TEST_REP ON_ERR TEST_STATE STOP TEST_SQUELCH OFF TEST_THRES OFF WIN_MODE SEC WIN_PREV CUR WIN_REP OFF WIN_BIT_LEN 09 WIN_SEC_LEN 00 00 01 PRINT_ENABLE ON PRINT_PORT PARALLEL AUDIO_VOL 0 AUDIO_RATE 3 PRBS_LENGTH 23 WORD_BITS 16 HAA H55 DATA_PATTERN WORD DATA_INVERT ON WORD_MEMORY 0 16 HAA H55 WORD_MEMORY 1 16 HAA H55 WORD_MEMORY 2 16 HAA H55 WORD_MEMORY 3 16 HAA H55 WORD_MEMORY 4 16 HAA H55 GB700 User Manual Analyzer Functions WORD_MEMORY 5 16 HAA H55 WORD_MEMORY 6 16
161. lected the Analyzer will continue to collect Test results until the CLEAR key is pressed At this point Test results will remain frozen until the CLEAR key is pressed again to start a new test 5 18 GB700 User Manual Analyzer Functions Display Mode Totalize Window or Test When the Analyzer is not in the menu mode you can select a display mode using the SELECT DISPLAY key The display mode determines which BER and Bit Error results are shown in the main display BER results are shown in the top middle field of the display while Bit Error results are shown in the top right field Display mode also determines which results will be cleared when you press the ERROR DETECTION CLEAR key Procedure to Select a Results Display Mode O Press the DISPLAY SELECT key to select a different display mode Selections are Totalize Window or Test The selected display mode will be indicated by the character in front of the BER result as explained in Table 5 6 below Note that there are three possible Test display mode characters T U and R which further indicate which Test timing mode Timed Untimed or Repeat has been set up Note that MODE is a parameter in the TEST menu Table 5 6 How to Tell Which Display Mode is Active Character In Front of BER Result Indicated Result Display Mode T U orR Test T Timed mode U Untimed mode R Repeat mode Clearing Results and Starting Tests To do this 1 Press DISPLAY SELECT unti
162. ler such as a PC or engineering workstation to its GPIB or RS 232C port With the exception of turning power on and off all Generator and Analyzer setup functions can be performed by remote control In addition all Analyzer results can be retrieved by remote control You can also use the RS 232C port to operate a gigaBERT700 Generator or Analyzer manually from either a terminal or a PC running a terminal emulation program Terminal control of the gigaBERT700 can be helpful when first learning the instrument s remote command language syntax or when debugging a control program It should be noted that gigaBERT700 remote commands are directly related to setup parameters and results rather than to front panel keys and menu selections For example to set Generator frequency to 700 MHz you would issue the command CLOCK_FREQ 700 0E 6 rather than issuing commands like press the FREQ key or press the up down arrow keys and so on Printer Basics Analyzer The Analyzer can print reports directly on a printer connected to its PRINTER or RS 232C ports Note that these two ports are commonly referred to as the parallel and serial ports respectively The Analyzer can also print reports indirectly by sending them to an external GPIB controller The Analyzer cannot however print reports directly to a GPIB printer Generator The Generator has no explicit printing functions But you can program an external controller to read the Generator s s
163. ling the following buttons and observing the LEDs turn ON and OFF Section LED Button Indicator Left Side PANEL LOCK ON OFF ADDR ON OFF D 8 GB700 User Manual Cleaning Instructions GB700 User Manual Clean the GB700 often enough to prevent dust and dirt from accumulating Dirt acts as a thermal insulator preventing effective heat dissipation and can also provide high resistance leakage paths between conductors or components in a humid environment Cleaning the Exterior Clean the dust from the outside of the instrument with a soft clean cloth or small brush A brush is especially useful for removing dust from around the buttons and connectors Remove hardened dirt with a soft cloth dampened with a mild detergent and water solution Do not use abrasive cleaners Cleaning the CRT Clean the light filter and CRT face with a soft lint free cloth dampened with denatured alcohol Do not use abrasive cleaners Cleaning the Interior Interior cleaning and maintenance should be performed by qualified service personnel only E 1 Cleaning Instructions E 2 GB700 User Manual Glossary GB700 User Manual Address A number specifying a particular user device attachment point The location of a terminal a peripheral device a node or any other unit or component in a network A set of numbers than uniquely identifies something a location in computer memory a packet of data traveling through a network Analog to D
164. lock signal A different amount of delay may be added to each of these inputs so that the Analyzer can accommodate different phase relationships between DATA REF DATA and CLOCK GB700 User Manual 5 9 Analyzer Functions Procedure to Add Delay 1 Select either the DATA or REF DATA inputs using the F2 and F3 keys 2 Press the DELAY key Verify that its LED turns on 3 Press the input up down keys while observing the amount of added delay in the bottom left field of the display Delay may be set in the range 0 to 4 ns in 20 ps steps The delay value shown in the display is in effect immediately In other words delay is changed each time you press the up or down key Note that delay is an AUTO SEARCH parameter Therefore you should normally turn off AUTO SEARCH if you want to fix delay at a specific value Input Termination The input termination can be independently selected for the CLOCK DATA and REF DATA inputs Note that the termination selected for CLOCK and DATA also applies to the CLOCK BAR and DATA BAR inputs Available input terminations are shown in Table 5 4 Table 5 4 Input Terminations for CLOCK DATA and REF DATA GND 50 ohms to ground 50 ohms to 2 VDC 50 ohms to 3 VDC 50 ohms via 0 01 uF capacitor to ground 5 10 GB700 User Manual Analyzer Functions Procedure for Selecting Input Termination 1 Select the DATA CLOCK or REF DATA inputs using the F2 and F3 keys 2 Press the TERM k
165. ly attempt to 1 set the decision level for the CLOCK and DATA inputs 2 setinput DATA delay 3 determine which PRBS or short word pattern is being received and 4 determine if the pattern is inverted or not DISABLE Use this key to enable or disable automatic pattern re synchronization If DISABLE is off then the Analyzer will automatically try to resynchronize its pattern detector by looking for a new pattern alignment when BER goes above the current synchronization threshold If DISABLE is on the Analyzer will not attempt to resynchronize regardless of the BER This allows for very high BER measurements LOCK indicator This indicator turns ON when BER is less than the current synchronization threshold and OFF when BER is greater than or equal to this threshold See Chapter 5 for a more detailed explanation of the AUTO SEARCH and DISABLE controls GB700 User Manual 2 21 BERT Basics and Feature Overview Menu Overview 2 22 A wide range of auxiliary setup functions is provided in the gigaBERT700 Generator and Analyzer menu systems To enter the Generator or Analyzer menu system simply press the instrument s F1 key At this point the format of the display will change to show the first page of the top level menu The top level menu in both the Generator and Analyzer contains other menus and various setup parameters Once inside the menu system you use the functions keys F1 F4 to navigate to any menu
166. lyzer Unless otherwise indicated all signal inputs and outputs are equipped with SMA female connectors and have a nominal input or output impedance of 50 ohms However a 75 ohm Option is available for both the Generator and Analyzer which changes nominal impedance of key inputs and outputs to 75 ohms See Appendix C Generator OUTPUT Section The OUTPUT section of the Generator front panel contains the outputs listed below For more detailed descriptions of these Generator outputs and related setup information see Chapter 4 L1 CLOCK and DATA outputs These two connectors comprise the main test signal output of the Generator DATA is the NRZ output of the pattern generator and CLOCK is its corresponding clock signal The amplitude and baseline offset of CLOCK and DATA are variable CLOCK and DATA may be used to drive single ended clock and data inputs respectively QO CLOCK BAR and DATA BAR outputs These are complimentary outputs to CLOCK and DATA That is CLOCK and CLOCK BAR together can drive a differential clock input while DATA and DATA BAR together can drive a differential data input These complementary outputs should be terminated with a 50 ohm load or a 75 ohm load if the 75 ohm Option is installed when not in use that is when the Generator is driving singled ended inputs O CLOCK 4 output This is a clock signal at one quarter the frequency of CLOCK This output may be useful when observing generator outputs usi
167. mp Outputs sss 2 15 2 3 Using F2 F3 to Select Input Set up ccccccncncononoconiconocononacanonccccnnnns 2 20 3 1 AC Power Fuse Types eeseseeeeeeeeee eene eene enne ene 3 2 3 2 PRBS 2N 1 Test Patterns oooooooonnnncncnononononococononononononanocnnnnnnnnnos 3 7 3 3 Mark Density Patterns eese enne ene 3 8 4 1 External Clock Input Specifications vs Termination 4 3 4 2 Output Setup Rules vs Termination Impedance 4 7 4 3 Data Inhibit Logic 2 0 eee ceeeesennececececeseesennnaeceeeeeseesenneaeeeeeeeeees 4 13 5 1 Actions taken by Analyzer when Synchronization is Lost 5 3 5 2 Synchronization Threshold eee 5 6 5 3 How F2 F3 determine Input Set up see 5 8 5 4 Input Terminations for CLOCK DATA and REF DATA 5 9 5 5 Input Threshold Range as a Function of Termination 5 11 5 6 How to Tell which Display Mode is Active eeeesesesss 5 18 6 1 Menu Descriptions ose na i ea nennen enne eret ene 6 6 6 2 Analyzer Menu System Overview 6 7 6 3 Generator Menu System Overview esee 6 8 7 1 RS 232C Serial Port Parameters sese 7 4 7 2 RS 232C Connector Pin QUt ccoconnnonoconcnccnnonononocnnonccnnncnnonnononccccnnnns 7 5 7 3 RS 232C Port Error Messages coooooooconcccconoconononnnonccnonanannanono
168. n M3 4 3 4 75 mark density pattern M7 8 7 8 87 5 mark density pattern Example recall_mark m7_8 recall_prom n Recall PROM This command is used to recall a word pattern from optional PROM programmable read only memory Up to 10 custom patterns may be specified by the customer and loaded into gigaBERT700 PROM at the factory Please contact Tektronix Customer Service for additional information on this option Min Abbr recall_p Arguments n lt NR1 gt in the range 0 to 9 this is the address of the word pattern to recall from PROM Example recall_prom 4 8 94 GB700 User Manual Specifications This appendix lists gigaBERT700 Generator and Analyzer specifications GB700 User Manual A 1 Specifications Generator Specifications Internal Clock Source Frequency range 150 kHz to 705 MHz Resolution 1 kHz Stability 10 ppm Number of frequency memories 10 External Clock Input Frequency range DC to 705 MHz Input level 500 mV to 1 4 V p p Impedance 50 ohms AC coupled Connector SMA Data Outputs Amplitude variable 500 mV to 2 0 V in 50 mV steps Baseline offset variable 2 0 V to 1 8 V in 50 mV steps Pulse top limit 2 8 V into 50 ohms 5 6 V into an open load Rise fall times 20 to 80 150 ps typical when amplitude equals 1 V Jitter 100 ps p p max referenced to EXT CLK Source impedance 50 ohms Output timing CLOCK and DATA are edge aligned 100 ps Connectors SMA Data Inhibit rear panel SMA ECL 50
169. n VER eene 6 37 Date DATE coro ocio ette eee e pae nope esee Te ee ued cates 6 38 Time CLIMB ii A EPI 6 39 GB700 User Manual vii Table of Contents Using Printers and External Controllers ooococcccccccncncncncncnonononcncncncncncncnnos 7 1 Remote Control Basics iiec tete ette t cs eot integrated is 7 2 Printer Basics rie rre ee there ree ep bete caido 7 3 Using the RS 232C Port nennen nennen eene 7 4 Using the GPIB Port iui ner there ote eden 7 8 GPIB Status and Event Reporting System sse 7 13 Remote Commands crece ecce eese eese eee eese en annee nes sette ossa asse ses sete nna nens 8 1 Command Summary Alphabetical oooooococcnnnncccoconacaconccncncononananonccccnnnns 8 7 Command Descriptions e iiser e eee r eee petet eg ee be Ae eie E VEE NE 8 12 Appendices SAA tevez evsevsdecssesesdtosess A 1 Default SetUngs x cisevessceccsdseossdecaeveecccessteveadeesessseosesesnssesesssonstevssseessssseosecesaoeses B 1 OPOS snin C 1 Customer Acceptance Test cssssssssssssssssscssscscscssscssssssssssscscssssssssssssssssess D 1 Cleaning Instructions eee e ee ee eee ee ee ener ener eee eee teet tette tette tette enn E 1 O OEE F 1 Inn cA I 1 viii GB700 User Manual Table of Contents List of Figures 2 1 Example of BERT Application eene 2 2 2 2 Nominal Genera
170. n the TEST menu Or you can print all Test results at the end of Test intervals or immediately using the REPORT or PRINT functions respectively in the TEST menu Q SIG LOSS The number of 20 ms intervals in which the Analyzer input activity detector sees no transitions on the input CLOCK signal for 20 ms QO SYNC LOSS The number of 20 ms intervals in which pattern synchronization lock is lost CQ PHASE ERR The number of 20 ms intervals in which a phase error event is detected The Analyzer will report a phase error when the active clock edge moves too close to the data waveform transition point thus violating the input circuit setup or hold time GB700 User Manual 5 29 Analyzer Functions a 5 30 Errored Seconds ES The number of seconds in the measurement interval containing one or more errors The gigaBERT700 measures asynchronous errored seconds that is one second intervals based on the instrument s internal clock rather than the detection of an error Errored seconds are not counted during unavailable time see below However the errored second count does include both severely errored seconds and non severely errored seconds ES TSE US where TSE total seconds in the current measurement interval with one or more errors US unavailable seconds in the current interval Errored Seconds ES Errored seconds as a percentage of the total number of seconds in the measurement interval ES ES TS 100 whe
171. nccncnnnns 7 7 7 4 GPIB Interface Functions cccccnnononocnncnccnnnnnnononnnonccnononnonanononcnncnnnns 7 4 7 5 Commands that generate Multi Unit Responses s 7 5 7 6 Status Registers Enable Registers and Related GPIB Commands 7 7 7 7 SESR Bit Definitions ococccccnnnnononanononcnnnnnnnononononccnononannonnnnnccccnnnns 7 4 7 8 Test Status Register Bit Definitions ccccononononocnnccnnnnononacanonacc nonns 7 5 7 9 Status Byte Register Bit Definitions ccococonononoccnccnnnnononacanonccn nnnns 7 5 X GB700 User Manual Table of Contents 8 1 SYMONS wives Fei secede oe Sate aie eter n ch sh dae oer ae 7 4 8 2 Numeric Response Types ccccceceessssssncececeeeseeseseaeeeeeeeeeeseeaas 7 5 8 3 Command Examples sees 17 A 1 Synchronization Thresholds with 128K Option Installed A 6 GB700 User Manual xi Table of Contents Safety Safety Terms Used in This User s Guide CAUTION Indicates an operation or practice that could harm the instrument WARNING Indicates an operation or practice that could result in personal injury or loss of life Safety Labels Found on the Instrument 7 S AN DANGER Protective Ground ATTENTION High Voltage Earth Terminal Refer to Manual AC Power The instrument is designed to operate from a power source that provides no more than 250 volts RMS between the two supply conductors or between either supply
172. nce a status bit is set to one it will remain in this state even if the corresponding event or status becomes false until the bit is reset by a command or when the instrument is depowered Each status register has an associated enable register Moreover each defined bit in a status register has a corresponding defined bit in the associated enable register When an enable bit is set to zero then the corresponding status bit is ignored by the instrument regardless of the state of the relevant event or instrument status However when an enable bit is set to one the corresponding status bit is enabled NOTE At power up all three gigaBERT700 enable registers are reset to 00000000 binary to effectively disable all status reporting functions Use the appropriate set commands to program each enable register as desired Commands The contents of any gigaBERT700 status or enable register can be read by an external controller using the appropriate query command The contents of any enable register can be set to a particular value using the appropriate set command The contents of the SESR register can be cleared using the Clear Status CLS command Note that the SESR and TSR are automatically cleared reset after they are queried For more information on GPIB commands see Chapter 8 The correspondence between gigaBERT700 status registers enable registers and commands is summarized in Table 7 6 GB700 User Manual Using Printers and External
173. nd of Test and On Error reports Parameters Reports On ccccccccc May be set to NONE All test reports are disabled END OF TEST Only EOT reports enabled ON ERROR Only On Error reports enabled EOT ERROR Both EOT and On Error reports enabled Notes If you want to generate reports be sure the ON OFF function in the PRINT menu is set to ON 6 18 GB700 User Manual Menu Functions Test Threshold THRES Format F1 ESC F4 SET ERROR THRESHOLD eeeee Menu TEST Function Name THRES Instruments Analyzer only Options None required This is a standard feature Application Use this function to set the value of the test threshold Parameters Test Threshold eeeee Set from 1E 03 to 1E 16 Notes The test threshold affects On Error reports and the TES threshold errored second result GB700 User Manual 6 19 Menu Functions Test Squelch SQUEL Format F1 ESC F4 SET ON ERROR SQUELCH ccc Menu TEST Function Name SQUEL Instruments Analyzer only Options None required This is a standard feature Application Use this function to enable or disable squelching of On Error reports Parameters On Error Squelch ccc Set to ON or OFF Notes When On Error Squelch is ON the analyzer will squelch temporarily stop printing On Error reports after ten consecutive reports that is ten consecutive seconds in which BER exceeds the current test threshold On Error reports will resume after 10 consec
174. nds counted either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_tes Returns lt NR1 gt Example res_tes command RES_TES 9823 response res_tes_per Results Threshold Errored Seconds Percentage This command returns the percentage of threshold errored seconds either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_tes_ Returns lt NR2 gt Example res_tes_per command RES_TES_PER 5 52 response res_tot_rate Results Total Bit Error Rate This command returns the average BER either of the current test interval so far or of the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_to Returns lt NR3 gt Example res_tot_rate command RES_TOT_RATE 4 29E 7 response GB700 User Manual 8 51 Remote Commands res_us Results Unavailable Seconds This command returns the number of unavailable seconds counted either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE
175. nerator Display 2 7 Generator Front amp Rear Panels 2 5 Nominal Generator Clock Data Waveforms showing Amplitude Baseline Offset and Vtop 4 6 Nominal Generator NRZ Data and Clock Output Waveforms 2 3 On Error Reports Example 5 26 Standard Event Status Register SESR 7 15 Status Byte Register SBR 7 17 TEST Measurement Process 5 17 Test Status Register TSR 7 16 TOTALIZE Measurement Process 5 15 WINDOW Measurements Process 5 16 Front amp Rear Panel Figures 2 4 Gz Generator Functions 4 1 Clock Source and Frequency 4 2 Data and Clock Outputs 4 5 Data Inhibit 4 13 Error Injection 4 11 PYNC and CLOCK 4 Outputs 4 10 Getting Started 1 1 Glossary F 1 M Menus 6 1 Menu Basics 6 2 Menu Function Definitions 6 9 Date DATE 6 38 External Clock Term CLOCK 6 35 GPIB 6 34 RS 232 Baud Rate BAUD 6 28 RS 232 Data Bits SIZE 6 30 RS 232 Echo ECHO 6 33 RS 232 End of Line Char EOL 6 31 RS 232 Parity PARITY 6 29 RS 232 Xon Xoff XON XOFF 6 32 Test Length LENGTH 6 16 Test Mode MODE 6 17 Test Print PRINT 6 21 Test Reports REPORT 6 18 Test Squelch SQUEL 6 20 Test Threshold THRES 6 19 Test View Current VIEW CUR 6 23 Test View Previous VIEW PRE 6 22 Time TIME 6 39 Utility Option OPTION 6 36 Utility Version VER 6 37 GB700 User Manual Window Interval in Bits BITS 6 25 Window Interval in Hrs Min Sec SECOND 6 26 Window Mode MODE
176. ng an oscilloscope that does not have the bandwidth to trigger on the CLOCK output Oh PATTERN SYNC output This is a train of pulses that occur once per pattern frame that is once per pattern repetition This output may be useful as a trigger signal when observing the Generator data output using an oscilloscope The location of PATTERN SYNC is fixed when generating PRBS or short word patterns or programmable when generating long word patterns requires 128K Option See Chapter 6 for information on how to set PSYNC pulse location using the menu system or Chapter 8 to set PSYNC pulse location using remote commands GB700 User Manual BERT Basics and Feature Overview Generator CLOCK Section The CLOCK section of the Generator front panel contains the external clock input described below For more information on using an external clock source and configuring the external clock input see Chapter 4 a INPUT input This is external clock input When the external clock mode is enabled EXT on the signal applied to this input will be used in place of the Generator s internal clock Otherwise when the internal clock mode is enabled EXT off any signal applied to this input will be ignored Generator Rear Panel The rear panel of the Generator contains the auxiliary signal remote control and AC power inputs shown below See Chapter 7 for instruction on how to set up the RS 232 and GPIB ports and general information on using exte
177. none Example error_single GB700 User Manual 8 43 Remote Commands Analyzer Commands The following commands are found only in the Analyzer command set Results Retrieve Commands Analyzer results commands are used to query the Analyzer for Test Window and Totalize interval results Note that Analyzer numeric results are returned in one three basic formats LC NRI or integer results which include various counts such as bits or bit errors up to a maximum of 16 digits Examples 0 1 15 45959 1234567890123456 Note that at a bit rate of 700 Mb s 16 digits can represent a bit count equivalent to over 165 days C lt NR2 gt or real number without exponent results such as percentages Examples 100 00 99 99 0 01 0 00 50 00 27 83 C NR3 or real numbers with exponent results such as BER have three significant digits with two places to the right of the decimal place and a signed exponent following the letter E Examples 1 00E 9 9 99E 7 2 08E 14 Vl NOTE Returning Current or Previous Test Results In response to queries for test interval results the Analyzer will return results from the current interval so far or from the previous interval based on the following rules 1 If the TEST PREV has been set to CURRENT and a test is in progress then the instrument will return results from the current test interval A test is in progress after TEST STATE is set to RUN until the controller or user
178. note that function descriptions are grouped by menu GB700 User Manual Menu Functions Word Edit EDIT Format Menu Function Name Instruments Options Application Parameters Notes 6 10 F1 ESC F2 gt F3 F4 SET WORD AT ddddd bbbbbbbb WORD EDIT Analyzer and Generator Requires the 128K Option Use this function to create new word patterns or edit the current word pattern Byte Location ddddd Set this parameter to the location in decimal of the byte you want to edit in the current word May be set in the range 00001 to M 1 where M the number of whole bytes in the current word If word length is M bytes plus N bits then the byte location of the last N bits is M 1 Byte Value bbbbbbbb This is the binary representation of the selected byte Edit this byte using the front panel bit keys MSB 1 LSB 8 Range 00000000 to 11111111 binary Use the WORD LENGTH function to set word length GB700 User Manual Menu Functions Word Length LENGTH Format F1 ESC F2 lt gt F3 F4 SET LEN mmmmm BYTES n BITS Menu WORD Function Name LENGTH Instruments Analyzer and Generator Options Requires the 128K Option Application Use this function to set the length of the current word pattern Parameters Bytes mmmmm Set this parameter to the number of whole bytes in the pattern length That is if length is M bytes N bits set this parameter to M Range 0 to 1
179. nt and is used to control the SRQ line on the GPIB bus The name of each defined bit in the SBR is shown in Figure 7 3 The function of each defined bit in the SBR is described in Table 7 9 Figure 7 3 Status Byte Register SBR Table 7 9 NOTE ok 7 18 Status Byte Register Bit Definitions Not defined MSS Master Status Summary This bit summarizes the state of the three other bits in the SBR It is set to 0 if all other bits are 0 It will be set to 1 when any other bit in the SBR equals 1 and its corresponding bit in the SRER is set to one The status of the MSS bit is reevaluated each time a bit in the SBR or the Service Request Enable Register SRER changes ESB Event Status Bit This bit summarizes the Standard Event Status Register SESR It is set to 0 if all bits in the SESR are 0 It is set to 1 if any enabled bit in the SESR equals 1 If the ESB is enabled and set to 1 then the RQS and MSS bits will be set to 1 The status of the ESB bit is reevaluated each time one of the bits in the SESR or the Event Status Enable Register ESER changes MAV Message Available This bit is set to 1 when there is an output available for the controller TSB Test Status Bit This bit summarizes the Test Status Register TSR It is set to O if all bits in the TSR are O It is set to 1 if any enabled bit in the TSR equals 1 If the TSB is enabled and set to 1 then the MSS and RQS bits will be set to 1 The status
180. o logically invert the input data pattern that is change all 1s to Os and Os to 1s If the INVERT key is off then the input data pattern is not inverted However if the INVERT key is on the input data pattern is logically inverted You can toggle input data inversion on or off by pressing the INVERT DATA key Note that logically inverting the input pattern is equivalent to swapping the connections to the DATA and DATA BAR inputs Procedure QO To toggle input data inversion on or off press the INVERT key Singled ended or Differential Operation Analyzer clock and data inputs can be operated in a singled ended or differential mode See Figure 5 1 Differential operation provides greater immunity to ground noise and EMI Note that threshold setup applies to the clock and data inputs only when they are operated in the singled ended mode When the clock or data input is operated in the differential mode its input threshold effectively becomes the average of the positive peak and negative peak voltage of the received true and complement signals Procedure to Configure CLOCK or DATA Inputs for Differential Operation GB700 User Manual Analyzer Functions 1 Select either the DATA or CLOCK input using the F2 and F3 keys 2 Press the DIFF key to toggle the selected input between differential LED on and singled ended LED off operation Selecting the Reference Data Mode In most testing applications the Analyzer is set up to
181. ock thres 2 00 clock thres Clock Threshold Query Returns the current Analyzer CLOCK input threshold voltage Min Abbr clock thre Returns lt NR2 gt Example clock_thres command CLOCK_THRES 2 00 response data_del_up and data_del_dn Data Delay Up Down Default This command pair is used to increment data_del_up or decrement data_del_dn the current DATA input delay by the default amount of 20 ps 0 02E 9 seconds Min Abbr data_del_u data_del_d Argument none Example data_del_up data_del_dn 8 56 GB700 User Manual Remote Commands data_del_up v and data_del_dn v Data Delay Up Down This command pair is used to increment data_del_up or decrement data_del_dn the current DATA input delay by v seconds Note that v is expressed as a real number with an exponent and is in the range of 20 ps to 4 00 ns Min Abbr data_del_u data_del_d Argument v lt NR3 gt 0 02E 9 to 4 00E 9 steps of 0 02E 9 20 ps Example data_del_up 0 02E 9 data_del_dn 0 10E 9 data_delay v Data Delay Sets the Analyzer DATA input delay to any value from 0 00 ns to 4 00 ns in 0 02 ns 20 ps steps Note that v is expressed as a real number with an exponent of 9 Min Abbr data_dela Argument v 0 00E 9 to 4 00E 9 in steps of 0 02E 9 Example data_delay 1 62E 9 data_delay Data Delay Query Returns the current value of the Analyzer DATA input delay setup parameter Min Abbr data_dela Returns lt NR3
182. oe will be separated by a semicolon Command Line Terminator RS 232C Interface Command lines issued to the instrument should be terminated by a simple carriage return CR Responses generated by the instrument will be terminated as specified by the user in the RS 232 EOL menu function that is CR LF CR LF or LF CR GPIB Interface Command lines issued to the instrument can be terminated by either EOI or EOI LF Responses generated by the instrument will be terminated as specified by the user in the GPIB menu function that is either EOI or EOT LF Maximum Number of Characters per Line Command lines may contain a maximum of 80 characters before the terminator Command Headers Names Each command must start with a header This header must contain either the full name of the command or an abbreviation containing at least all of the leading significant characters identified for that command name In addition query commands must end with a Upper and Lower Case All characters in a gigaBERT700 command line may be entered in either upper or lower case Arguments Commands may include one or more arguments parameters following the header The first argument following the header must be separated from the header by one or more blank characters spaces Subsequent arguments must be separated from previous parameters using commas Blank Characters Spaces One or more spaces are required between the command header and fi
183. oggle between internal clock mode LED off and external clock mode LED on Q INPUT This is an input for an external clock source A signal must be provided to this input when clock mode is set to external However when clock mode is internal any signal appearing at this input will be ignored See Chapter 4 for detailed Generator clock setup procedures 2 18 GB700 User Manual BERT Basics and Feature Overview Generator OUTPUT Section The controls shown below are used to set up the Generator s clock and data outputs See Chapter 4 for Generator clock and data output setup procedures C CLOCK Use this key to select clock amplitude and offset set up mode C DATA Use this key to select data amplitude and offset set up mode O AMPLITUDE T 1 Use these up down keys to adjust clock or data output amplitude BASELINE OFFSET T 1 Use these up down keys to adjust clock or data baseline offset INVERT DATA Use this key to toggle between output data inverted LED on and non inverted LED off mode Generator ERROR INJECT Section Controls in the ERROR INJECT section are used to set up the Generator s error injection function See Chapter 4 for more information on how to set up the Generator s internal error injection function and how to use an external signal source to control error injection a a RATE Press this control one or more times to select an internal error inject rate or the external error inject
184. ogic low DATA or CLOCK Output I Vocamp 50 Negative Supply 4 6 GB700 User Manual Generator Functions Amplitude and Baseline Offset The rules governing the setup of clock and data amplitude and baseline offset are as follows CQ RULE 1 When terminated by 50 ohms to ground the amplitude adjustment range of clock and data outputs is 0 to 2 V peak to peak However the absolute voltage of the pulse top cannot exceed 2 8 VDC that is Vamplitude p p Voffset lt 2 8 VDC Q RULE 2 When left unterminated termination impedance gt 2 KQ the amplitude adjustment range of clock and data outputs is 0 to 4 V peak to peak with a pulse top limit of 5 6 VDC that is Vamplitude p p Voffset lt 5 6 VDC QO RULE 3 Displayed amplitude and baseline offset are calibrated for a termination of 50 ohms to ground Any variation of termination impedance or voltage will cause actual amplitude and offset to differ from the values shown in the Generator display These rules are summarized in Table 4 2 Table 4 2 Output Setup Rules vs Termination Impedance V pp VDC Amplitude Offset VDC AC 2 8 as displayed unspecified 50 Q to AC The following controls are used to set clock and data output amplitude and baseline offset Ud CLOCK UA DATA C AMPLITUDE T 1 C BASELINE OFFSET T 1 Note that when the CLOCK key is pressed its LED turns on and the display shows clock output amplitude and offset Similarly
185. ollowing F1 ESC FA SET REPORTS ON EOT ERROR 11 To lock in this change and return to the TEST menu press F4 F1 F2 F3 FA MORE LENGTH MODE REPORT 12 Since all of the setup goals have been accomplished we now want to exit the Analyzer menu system To do this from the TEST menu or from any menu simply keep pressing the F1 key until the normal display appears In this example you would see the following a Press F1 and see the second page of the TEST menu b Press Fl a second time and see the third page of the TEST menu c Press Fl a third time and see the first page of the main menu again 6 4 GB700 User Manual Menu Functions d Press Fl a fourth time to see the second page of the main menu e Press F1 a fifth time and see the third page of the main menu Press Fl a sixth time to exit the menu system and see the normal Analyzer display format At this point you could perform a 30 minute timed test by 1 2 Selecting the TEST display mode press DISPLAY SELECT until a T appears in front of the BER field and Pressing the ERROR DETECTION CLEAR key to start a timed test interval General Rules for Using the Menu System Operation of the gigaBERT700 Analyzer and Generator menu systems can be summed up by the following rules 1 2 GB700 User Manual From the normal display mode press F1 to enter the menu system Navigate to a particular menu function by pressing the appropriate F keys to sel
186. onds SES Severely Errored Seconds TES Threshold Errored Seconds ES Errored Seconds EFS Error Free Seconds DM Degraded Minutes SIG LOSS SEC seconds in which a loss of signal has occurred SYNC LOSS SEC seconds in which a loss of pattern synchronization has occurred PHASE ERR SEC seconds in which a phase error has occurred 6 22 GB700 User Manual Menu Functions Test View Current VIEW CUR Format F1 ESC F4 SET result name count Menu TEST Function Name VIEW CUR Instruments Analyzer only Options None required This is a standard feature Application Use this function to view current test results In effect this function takes a snap shot of the latest results from a test in progress Parameters None This is an immediate function Use pattern up down keys to scroll through results Available results are the same as for VIEW PRE except that STOP time is replaced by the message TEST IN PROGRESS Notes If the TEST process is currently stopped this function will display the error message NO TEST IN PROGRESS GB700 User Manual 6 23 Menu Functions Window Mode MODE Format F1 ESC FA SET WINDOW MODE ccccccc Menu WINDOW Function Name MODE Instruments Analyzer only Options None required This is a standard feature Application Use this function to set window length equal to the number of bits specified by the WINDOW BITS function or the time specified by the W
187. ord 5 word_bits le b1 b2 Word Bits Sets current word length to le bits and sets the current word pattern to the bit sequence represented by b1 and b2 Min Abbr word_b Arguments le 8 or 16 bl 00 to FF hexadecimal Q000 to Q377 octal B00000000 to B11111111 binary b2 sameasbl However b2 is allowed only if le length is set to 16 Example word_bits 16 B10101010 B11110000 GB700 User Manual 8 21 Remote Commands word_bits Word Bits Query The response will be in the form n byte 1 byte 21 where n is either 8 or 16 the current word length and byte 1 and byte 2 are hex octal or binary representations of the first and second bytes in the pattern Note that byte 2 will be included only if pattern length is 16 Min Abbr word b Returns lt NR1 gt lt non decimal numeric s gt Example word_bits command WORD BITS 16 HAA HFO response indicating that the current word length is 16 bits and the current pattern is AAFO hex word_length le Word Length Sets the current word pattern length to 8 or 16 bits Min Abbr word_l Argument le 8 or 16 Example word_length 16 V NOTE There is no query form to the word_length command However you may use the word_bits query to read the current word length word_mem_len m le Word Memory Length Sets the length of the word pattern saved in location m to le bits Min Abbr word mem l Arguments m 0 1 9 0
188. owing procedure as an initial self check of your new gigaBERT700 Generator and Analyzer Itis also a useful introduction to the basic features and operation of the gigaBERT700 The fan openings of the gigaBERT700 need 2 inches of clearance for proper ventilation Procedure 1 Make sure both the Generator and Analyzer are equipped with the proper fuse See Section 3 1 2 Make sure that the Generator and Analyzer rear panel power switches are ON and that their front panel power switches are in the STBY position 3 Plug both instruments into grounded three conductor AC power outlets 4 Connect a 50 ohm SMA cable from the Generator CLOCK output to the Analyzer CLOCK input 5 Connect a 50 ohm SMA cable from the Generator DATA output to the Analyzer DATA input 6 Power the Generator while pressing and holding its VIEW ANGLE MSB 1 and PATTERN CLEAR keys simultaneously Release the key after the message Default Settings appears in the display Repeat this procedure with the Analyzer This will force both the Generator and Analyzer to power up using factory default settings 7 Set up the Generator clock and data outputs using controls in the OUTPUT box as follows Press the DATA key Press AMPLITUDE up down keys until data amplitude is set to 2 00V Press CLOCK Press AMPLITUDE up down keys until clock amplitude is set to 2 00V GB700 User Manual 1 3 Getting Started 10 11 12 13 Set Generator
189. ows 1 Press the ADDR key in the GPIB section of the front panel The LED in the GPIB key will then turn on and the display will show GPIB aa where aa is the instrument s current address 2 Press the up down keys closest to the GPIB section to set the instrument s address as required In other words use the CLOCK section up down keys on the Generator or the INPUT section up down keys on the Analyzer 3 When GPIB address is set to the desired value press the GPIB key again The LED in the GPIB will turn off indicating that the new GPIB bus address is in effect You cannot change GPIB address via the GPIB port However you can change GPIB address remotely via the RS 232C port GPIB Message Terminator The GPIB message terminator may be set to either EOI or EOI LF When EOL is selected the instrument will assert the GPIB EOI line along with the last byte of each message transmitted When EOT LF is selected the instrument will add one byte containing the LF line feed character to the end of each message and then assert the EOI line Use the GPIB menu function to set the GPIB terminator as follows 1 Press Fl to enter the menu system 2 Select the GPIB function F3 on the first page of the Generator main menu or F3 on the second page of the Analyzer main menu GB700 User Manual 7 7 Using Printers and External Controllers 7 8 3 Use the pattern up down keys to set the GPIB terminator to one of the following two values
190. perator at any time How WINDOW Results Are Measured Window Mode results are calculated over an sliding window whose length is defined by the user Window results can be cleared at any time by pressing the CLEAR key when Window Mode results are displayed But as in the case of Totalize results the Window measurement process cannot be suspended by the user Window results may be thought of as a series of snapshots of the received signal performance Each snapshot indicates BER and total bit errors over the most recent interval T where T is the value of the Window length set by the user The amount of slide between snapshots is effectively determined by the display update rate which is about five times per second Therefore the Window slide between display updates is about 200 ms Note that End of Window reports are generated once per second so the effective window slide in printed results is one second The Window measurement process is illustrated in Figure 5 3 5 16 GB700 User Manual Analyzer Functions Figure 5 3 The WINDOW Measurement Process CLEAR WINDOW interval W is setin terms p W h of bits or time in using WINDOW menu Slip time S is effectively 200 ms in display or 1 sec in End of Window reports How TEST Results Are Measured Unlike Totalize and Window results the accumulation of Test results can be started or stopped by pressing the CLEAR key That is the CLEAR key in effect becomes a test start stop key W
191. ple rs_prompt gB 700 gt command will change the prompt to gB 700 gt nn V NOTE This command may be issued with a null string disable the RS 232C prompt argument to rs xon xoff onl off RS 232C XON XOFF This command enables or disables XON XOFF flow control on the RS 232C port Min Abbr rS x Arguments on enables XON XOFF flow control off disables XON XOFF flow control Example rs xon xoff on 8 28 GB700 User Manual Remote Commands rs_xon_xoff RS 232C Xon Xoff Query This command returns a character string indicating whether RS 232C port Xon Xoff flow control is enabled or disabled Min Abbr rs_x Returns on off Example rs xon xoff command RS XON XOFF ON response GB700 User Manual 8 29 Remote Commands Misc Shared Commands all mem All Memory Generator Returns a character string indicating the current Generator clock source INT or EXT the contents of all 10 Generator frequency memories and the contents of all 10 Generator word memories Min Abbr Returns Example all string lt NR1 gt lt NR3 gt lt NR1 gt lt NR1 gt lt Non decimal numerics gt all_mem command CLOCK_SOURCE INT response CLOCK_MEMORY 0 500 000E 6 CLOCK_MEMORY 1 550 000E 6 CLOCK_MEM 9 700 000E 6 WORD_MEMORY 0 16 HAA HBB WORD MEMORY 1 8 HFO WORD MEMORY 9 16 HFF H00 All Memory Analyzer Returns the contents of all 10 Analyzer wo
192. port serial selects the rear panel RS 232C port print_port parallel 8 79 Remote Commands print_port Print Port Query Returns the currently selected printer port Min Abbr print_p Returns parallel gpib serial Example print_port command PRINT_PORT PARALLEL response print string s Print String This command prints a character string s to the currently selected printer port Min Abbr print s Arguments s a character string enclosed in quotes Example print string This is a test GB700 User Manual Remote Commands Audio Beeper Setup Commands audio_rat_up and audio_rat_dn Audio Rate Up Down Default This command pair is used to increment audio_rat_up or decrement audio_rat_dn by one the exponent of the current error beeper BER threshold Min Abbr audio_rat_u audio_rat_d Arguments none Example audio_rat_up This command adds one to the exponent of the beeper BER threshold audio rat up v and audio rat dn v Audio Rate Up Down This command pair is used to increment audio rat up or decrement audio rat dn the exponent of the error beeper BER threshold by an amount v Note that because the exponent is negative the audio rat up command decreases the BER threshold while audio rat dn increases the threshold Min Abbr audio rat u audio rat d Arguments v 1 2 8 14 Example audio rat up 9 The above example adds 9 to the exponent for example chang
193. ports by selecting NONE Press F4 to lock in you selection oF WON D 7 Press F1 multiple times until you have exited the menu system End of Window Reports When enabled an End of Window report will occur once every second The results of an End of Window report are based on a sliding interval T where T is set in terms of bits or time hours minutes seconds Use the REPORT parameter in the WINDOW menu to enable or disable End of Window reports Use the MODE BITS and SECOND parameters in the WINDOW menu to set window length T An example End of Window report is shown in Figure 5 7 Figure 5 7 Example End of Window Reports Date Jun 14 92 Time 02 42 34 46 Bits 5 00E 08 Errs 5000 Err rate 1 0E 04 Freq 100 00 MHz Pattern AA55 Data los 0 Sync Los 0 Phase Err 0 Procedure to Enable or Disable End of Window Reports Complete the Basic Report Setup Procedure Press F1 to enter the menu system Select the WINDOW menu F3 Press F1 to see the second page of the WINDOW menu Select the REPORT parameter F2 Set the REPORT parameter to ON Press F4 to lock in this choice Exit the menu system by pressing F1 multiple times until the normal display format appears Aa oP ON 5 26 GB700 User Manual Analyzer Functions On Error Reports When enabled On Error reports are generated for each second in which error rate is above the current THRES threshold Note that On Error reports can be squelched after reports
194. rast of the display can be optimized for the user s viewing angle Step 38 Repeat Step 37 for the Analyzer Step 39 Set the Generator and the Analyzer to Factory Default settings Verify that the Analyzer SYNC LOCK light illuminates Push the CLEAR key in the ERROR HISTORY section Record the delay value shown on the display lower left display area for later use De select AUTOSEARCH on the Analyzer Press the DELAY key in the input section of the Analyzer Vary the delay using the UP and DOWN arrow keys in the input section of the Analyzer until the PHASE light in the ERROR HISTORY section illuminates Manually return the Analyzer delay setting to that recorded above Verify that the PHASE light can be extinguished by the CLEAR key Confirmation of Selectable Analyzer Terminations a a a D 6 Step 40 Set the Generator and Analyzer to Factory Default Settings Confirm that the Analyzer F2 LED is not lighted Step 41 Push the Analyzer TERM button and confirm that the LCD displays GND Step 42 Perform the following actions for each termination listed a Select the Analyzer termination by using the UP and DOWN arrow keys in the INPUT section b On the Generator select PN15 wait a few seconds then select PN7 Use the UP and DOWN arrow keys to select the different PN values c Wait for the Analyzer LOCK light to come on d Confirm the Analyzer threshold display falls within the limits s
195. rate of the test signal GB700 User Manual BERT Basics and Feature Overview Figure 2 2 Nominal Generator NRZ Data and Clock Output Waveforms Falling edge of CLOCK Rising edge of CLOCK Coin in middle ofDATA eye cident with DATA transitions A ILI Y The nominal Generator clock data phase relationship is fixed so that the falling edges of the clock signal occur in the middle of bit time slots of the data signal The amplitude and baseline offset of the Generator s clock and data outputs are adjustable to insure compatibility with a wide range of input circuit designs and logic families including ECL positive ECL and GaAs The gigaBERT700 Analyzer also known as the receiver or Rx can terminate and analyze the NRZ output of a digital device module or system being tested by the gigaBEHT700 Generator or an equivalent signal source The decision voltage or threshold of the Analyzer DATA and CLOCK inputs can be adjusted to accommodate different logic families The Analyzer can also add a variable amount of delay to the input data signal to accommodate different clock data phase relationships at the output of the device under test The primary measurements made by the gigaBERT700 Analyzer are bit errors and bit error rate GB700 User Manual 2 3 2 4 BERT Basics and Feature Overview Front and Rear Panels The front and rear panels of the gigaBERT700 Generator and Analyzer are illustrated in Figures 2 3 and 2 4 resp
196. rd memories Returns Example lt NR1 gt lt NR1 gt lt Non decimal numerics gt all_mem command WORD_MEMORY 0 8 HFF response WORD MEMORY 1 16 HAA H00 WORD_MEMORY 9 8 H00 M NOTE When the 128K Option is installed the All_mem command will not return the contents of Analyzer or Generator word memories 8 30 GB700 User Manual header on off Remote Commands Header Tells the instrument whether or not to include headers command names in responses Min Abbr Arguments Example he on include headers off do not include headers header on header Header Query Returns a character string indicating the instrument s header status Min Abbr Returns Example logo he on off header command HEADER ON response Logo Query Returns a character string showing the Generator or Analyzer logo including company name BERT model number Generator or Analyzer identifier and software version number This command may be used only on the RS 232C port Use the idn query to get this same information over the GPIB port Min Abbr Returns Example GB700 User Manual p TEKTRONIX BERT 700 RX TX Vs ss mm yy where RX indicates Analyzer TX indicates Generator Vs ss software version number e g V3 00 mm yy software revision month and year logo TEKTRONIX BERT 700 RX V3 00 10 93 8 31 Remote Commands options Options Query
197. re ES errored seconds in the measurement interval TS total seconds in the measurement interval EFS The number of seconds that contain no errors and are not unavailable EFS TS ES US where TS total seconds in the measurement interval ES errored seconds in the measurement interval US unavailable seconds in the measurement interval EFS Percentage Error free Seconds Error free seconds as a percentage of the total number of seconds in the measurement interval EFS EFS TS 100 where EFS error free seconds in the measurement interval TS total seconds in the measurement interval Severely Errored Seconds The number of errored seconds in the measurement interval which BER is greater than or equal to 1E 03 excluding unavailable seconds For example on a 100 Mb s test signal this would include all available synchronous errored seconds with 100 000 or more errors SES seconds with BER gt 1E 03 US GB700 User Manual Analyzer Functions where US unavailable seconds in the current interval GB700 User Manual 5 31 Analyzer Functions a 5 32 TES Threshold Errored Seconds The number of seconds in the measurement interval in which BER exceeds the threshold set by the THRES parameter in the TEST menu minus the number of unavailable seconds Available threshold values are 1E n where n 2 3 16 TES seconds with BER gt Threshold US where US unavailable
198. rity Analyzer will attempt to find new pattern alignment off on No setup change Analyzer will continue to measure BER and count errors this combination not allowed GB700 User Manual Analyzer Functions 5 4 AUTO SEARCH With PRBS Patterns When using a PRBS pattern you can enable the AUTO SEARCH feature as follows Procedure 1 Set up the Generator to transmit a PRBS pattern 2 Set up the Analyzer as follows OU EXT ref data input control off 0 SYNC DISABLE off C AUTO SEARCH on After you perform this procedure the auto search feature will be enabled and the instrument will immediately attempt to re synchronize with the received test signal Once lock is achieved that is once BER goes below the synchronization threshold the BIT and PHASE history indicators will be cleared turned off and all current error counts will be reset to zero The SYNC LOSS indicator will remain on however until cleared by the user V NOTE The AUTO SEARCH feature will work over a wide range of conditions Therefore if you have set up the Generator to generate a standard PRBS enabled the AUTO SEARCH feature on the Analyzer but the Analyzer LOCK LED still fails to turn on then it is likely that a problem exists in the device under test or your patch cord connections AUTO SEARCH with Non PRBS Patterns In cases where you need to use a word or other type pattern for testing you can still use AUTO SEARCH to set DATA
199. rnal controllers with the Generator a a a AUX This connector is not used DATA INHIBIT INPUT A signal applied to this input may be used to asynchronously gate the data outputs of the Generator ERROR INJECT INPUT A signal applied to this input may be used to control error injection when the Generator is in the external EXT ERR injection mode One error will occur for each rising edge of this signal RS 232C input output A two way serial port that may be connected to an external controller or serial printer GPIB input output An IEEE 488 standard I O port that may be connected to a GPIB compatible controller This port is not compatible with stand alone GPIB printers AC LINE power input This is the AC power input connector for the Generator Analyzer INPUT Section The INPUT section of the Analyzer front panel contains the test signal NRZ data and clock inputs shown below For more detailed descriptions and related setup information see Chapter 4 a GB700 User Manual CLOCK and DATA inputs These two inputs comprise the main test signal input to the Analyzer DATA is the main NRZ data input to the Analyzer pattern detector and CLOCK is its corresponding clock signal Both inputs have adjustable input decision thresholds and selectable terminations In addition a variable amount of delay may be added to the DATA input to properly phase align the clock and data signals CLOCK and DATA 2 11 BERT Basics and
200. rrent word pattern to one of eight word memory locations WORD 0 to WORD 7 using the following procedure 1 Press the SAVE key The LED in the SAVE key should flash to indicate that you are in the save mode 2 Press the pattern up down keys to select a word memory location Note that the word previously stored in this location will be overwritten 3 Press the SAVE key again to save the current word into the selected location At this point the SAVE LED will turn off GB700 User Manual 3 17 Common Functions Recalling Word Patterns To recall a previously saved word pattern use the following procedure 1 Press RECALL to enter the recall mode Note that the LED in the RECALL key turns on V NOTE If the current word is important and has not been previously saved you must save it before pressing RECALL The recalled pattern will overwrite the current pattern 2 Select a word pattern memory location by pressing the pattern up down keys The eight possible word memory selections are WORD 0 through WORD 7 In addition if the 128K Option is installed you will see the following five mark density pattern selections MRK 1 8 MRK 1 4 MRK 1 2 MRK 3 4 and MRK 7 8 The selected word becomes the current word immediately In other words the current word is over written each time you press the up or down key 3 You can now use the recalled word to perform tests Note that if you want to edit the recalled word you must press t
201. rst parameter if any Otherwise spaces are ignored by the gigaBERT700 and may be used on a command line between headers parameters or required separators for readability GB700 User Manual Remote Commands Setting Arguments Outside of Legal Ranges If you issue a set command with an argument value that is outside the allowed range for that argument then the instrument will reject the command Numeric Responses If the response to a query command is a number then it will be specified as one of the following types Table 8 2 Numeric Response Types decimal integer e g 8 decimal real number without exponent e g 2 00 decimal real number with exponent e g 700 0E 6 lt Non decimal numeric gt non decimal number with leading H hexadecimal Q octal or B binary GB700 User Manual 8 5 Remote Commands Command Examples The following are some typical gigaBERT700 set and query command examples Table 8 3 Command Examples clock_freq Returns the current output clock frequency setup of the Generator or the measured input clock frequency of the Analyzer word_memory Returns the saved word patterns in all 10 word memory locations word_memory 7 Returns the saved word pattern in word memory location 7 word memory 9 16 Haa H23 Sets the 16 bits of the word pattern stored at location 9 to the bit sequence represented by AA23 hexadecimal word_bits 8 Q307 Sets the first eight bits o
202. s not in the range specified for the command Parameter Not In Set Parameter value is not in the set of allowed values for the command Invalid String Length Parameter character string is too long for the command Parameter Separator An expected semicolon between two parameters is missing or a command ie is terminated immediately after a semicolon Invalid Non decimal Parameter Parameter is not in a valid non decimal format or the value of the parameter is out of the range 0 to 255 decimal Command Execution Error The instrument did not execute the command properly Out of Memory Processor is out of memory 7 6 GB700 User Manual Using Printers and External Controllers Using the GPIB Port The following section describes how to set up the GPIB port and provides an overview of gigaBERT700 GPIB functions Note that the following two parameters must be set up properly to use the GPIB port 1 Address 2 Message terminator GPIB Instrument Address For normal operation the GPIB bus address of a gigaBERT700 Generator or Analyzer must be set in the range 0 to 30 decimal However from the front panel you can set the GPIB address above 30 or below 0 to put the instrument off bus The address of each instrument on a GPIB bus including the Generator and Analyzer if they are on the same bus must be unique The GPIB address of a Generator or Analyzer is set using front panel keys as foll
203. s v lt NR2 gt in the range 2 00 to 1 80 in steps of 0 05 Example offset 1 50 offset Offset Query Returns two message units the first containing the Generator clock output baseline offset and the second containing the Generator data output baseline offset Min Abbr off Returns lt NR2 gt lt NR2 gt Example offset command CLOCK_OFFSET 1 500 response DATA_OFFSET 1 500 8 42 GB700 User Manual Remote Commands Error Injection Commands error rate offlextlrate_3lrate_4lrate_5lrate_6lrate_7 Error Rate Sets the Generator output bit error injection rate to off external or one of the following specified values 10 3 10 4 10 5 10 6 or 1077 Min Abbr error_r Arguments off turns error injection off ext selects the external error injection mode rate_3 sets bit error injection rate to 1073 rate 4 sets bit error injection rate to 10 4 rate 5 sets bit error injection rate to 1079 rate 6 sets bit error injection rate to 10 6 rate 7 sets bit error injection rate to 1077 Example error rate rate 6 error rate Error Rate Query Returns a character string indicating the current Generator output error injection mode and rate Min Abbr error r Returns offlextlrate_3lrate_4lrate_5lrate_6lrate_7 Example error_rate command ERROR_RATE RATE_6 response error_single Error Single This command injects a single bit error into the Generator output signal Min Abbr error_s Arguments
204. search mode the Analyzer and the Generator are now linked and synchronized The following checks will confirm the functionality of the units Confirmation of Frequency Function a a a a a Step 6 In the Generator CLOCK section the FREQUENCY LED should be on If it is not press the FREQUENCY key to select it Step 7 Use the Generator CLOCK up down keys to change the output frequency Step 8 Check that the frequency displayed by the Analyzer matches the Generator output to within 0 1 MHz Note that the resolution of the Analyzer is 0 01 MHz and that the resolution of the Generator is 0 001 MHz Step 9 At the Generator use the STEP key to select another frequency step size note the placement of the underscore on the Generator frequency display and repeat steps 7 and 8 at this step size Step 10 Repeat steps 7 through 9 for all step sizes Confirmation of Selectable Data Patterns O OO DDDDDOCOC D 4 Step 11 In the Generator PATTERN section verify that the PRBS LED light is on If not press the PRBS key to select it Step 12 Press the Generator PATTERN up down keys to select PRBS pattern PN7 Step 13 Verify that the Analyzer displays the same PRBS pattern as the Generator Step 14 At the Analyzer press the CLEAR key in the ERROR HISTORY section Step 15 Verify that the four ERROR HISTORY LEDs are off and stay off Step 16 At the Generator use the PATTERN up down keys to select
205. seconds in the current interval Degraded Minutes The number of 60 second intervals in the current interval in which the BER exceeds the current test threshold THRES Percentage Degraded Minutes DM The number of degraded minutes expressed as a percentage of the total number of minutes in the measurement interval DM DM TM 100 where DM degraded minutes in the measurement interval TM total minutes in the measurement interval Unavailable Seconds US The number of seconds in unavailable intervals Unavailable intervals start upon the detection of 10 contiguous severely errored seconds SES and end upon the detection of 10 non severely errored seconds Percentage Unavailable Seconds US The number of unavailable seconds expressed as a percentage of total seconds in the measurement interval US US TS 100 where US unavailable seconds in the measurement interval TS total seconds in the measurement interval GB700 User Manual Analyzer Functions Error History Indicators The Analyzer performance history indicators are located in the ERROR HISTORY section of the front panel These indicators will latch on when the indicated event occurs and can be cleared by the user Indicator Definitions QO SYNC LOSS This indicator will turn on if the LOCK LED turns off that is if the BER rises above the current synchronization threshold See Synchronization LOCK Threshold in Chapter 4 UA B
206. sets TEST STATE to STOP or the instrument automatically stops a test at the end of a timed test interval 2 If TEST PREV has been set to PREVIOUS and there are previous results available then the instrument will return results from the previous test interval Previous results become available after TEST STATE has made at least one RUN to STOP transition 3 Otherwise the Analyzer will not return results but instead will set the EXE bit bit 4 of the Standard Event Status Register SESR 8 44 GB700 User Manual Remote Commands clock_freq Clock Frequency Returns the CLOCK input frequency in Hz that is measured by the Analyzer Min Abbr clock_f Returns lt NR3 gt in format ddd ddE 6 Example clock_freq command CLOCK_FREQ 700 00E 6 response res_bits Results Bits Query This command returns the number of bits counted either in the current interval so far or the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_b Returns lt NR1 gt Example res_bits command RES BITS 4230452921 response res_cur_rate Results Current Rate Query This command returns the BER measured either in the most recent second of the current test interval or the last second of the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous
207. ssesceresesssseseerese 6 13 Word Sync Pulse PSYNO eese 6 14 Word Synchronization Threshold SYNC eese 6 15 Test Eength EENGITLH a oett entere ip oer poten 6 16 lest Mode MODE etes e tied ve a eee ES adi 6 17 Test Reports REPORT oococccncncnnnnnnonononononononononononononononononananonos 6 18 Test Threshold THRES esee 6 19 Test Squelch SOQUEL acarieni inaen aoe 6 20 Test Print PRIN T 00 e e lc e perdete 6 21 Test View Previous VIEW PRE eese 6 22 Test View Current VIEW CUR esses 6 23 Window Mode MODE resies renesansne tee ean ea E Eaa 6 24 Window Interval in Bits BITS ooncccnnnnnonononoccccncnonnnnonononocnnnnnnnnos 6 25 Window Interval in Hrs Min Sec SECOND ssseeses 6 26 Window Reports REPORT eese 6 27 RS 232 Baud Rate BAUD ooocccccnnnnoconocononoconnnnnononnnoncnnnnanannnnnnnnoos 6 28 R5 232 Patty PARTLY eerte eres 6 29 R5S 232 Data Bits SIZE id 6 30 RS 232 End of Line Char EOL ooooonnnccncnononnnonocnccnnnnnnnnnnnnnacnncnnos 6 31 RS 232 Xon Xoff XON XOFE coccococooononnnonccocnnnnononnnnnccncnanannonnnnnoos 6 32 R9S 232 Echo ECHO done e tee deed e e e 6 33 GPIB SE nie pa ern das 6 34 External Clock Term CLOCK sse 6 35 Utility Option OPTION sssssseeseeeeeeneeeee eren enne 6 36 Utility Versio
208. st state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_p Returns lt NR1 gt Example res_pha_es command RES_PHA_ES 591 response res_ses Results Severely Errored Seconds This command returns the number of severely errored seconds counted either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_ses Returns lt NR1 gt Example res_ses command RES_SES 1290121 response res_ses_per Results Severely Errored Seconds Percentage This command returns the percentage of severely errored seconds counted either in the current test interval so far or in the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_ses_ Returns lt NR2 gt Example res_ses_per command RES_SES_PER 27 70 response GB700 User Manual 8 49 Remote Commands res_start Results Start Time This command returns a quoted string indicating the start time either of the current test interval or the previous test interval depending on the setup of TEST PREV and the current test state See NOTE Returning Current or Previous Test Results on page 8 44 Min Abbr res_sta Returns lt qstring gt qstring in the format
209. ster SESR and O the Status Byte Register SBR These two status registers which indicate the overall status of the instrument are defined in ANSI IEEE Std 488 2 1987 The Analyzer also contains a third status register which indicates the current state of various measurement processes This register deals with functions specific to the gigaBERT700 Analyzer and is not defined in ANSI IEEE Std 488 2 1987 The name of this status register is O the Test Status Register TSR The Generator and Analyzer have one enable register associated with each of their status registers The names of the three gigaBERT700 enable registers are OU The Event Status Enable Register ESER L The Test Status Enable Register TSER and QO The Service Request Enable Register SRER Note that the TSER enable register like the associated TSR status register is found only in the Analyzer GB700 User Manual 7 13 Using Printers and External Controllers How Status and Enable Registers Work A status register may contain defined used bits and undefined unused bits Each defined bit in a status register corresponds to a given instrument status or event Once cleared set to zero the value of a status bit will remain zero false as long as the corresponding event or status does not occur However if it is enabled the value of a status bit will be set to one true when the corresponding event or status occurs Status bits are latched That is o
210. t Settings Analyzer Factory Default Settings Clock Data and Reference Data Inputs Input data delay oooconococcnococononanononcnonononononanonnnoos 0 ps Input data threshold sess 0 00 volts Input clock threshold usse 0 00 volts Input clock mode erp ette ttn rr single ended Input data mode eue rri I neo E eR etd single ended Reference data delay sess 0 ps Reference data threshold 1 50 volts Input data termination esses GND Input clock termination eese GND Reference data termination ess GND Reference data mode eese off The instrument may change these settings automatically if the Auto Search feature is enabled Auto Search Pattern Synchronization Auto Search mode eene on Synchronization disable suus off Error display select mode Totalize Error Beeper Audio volume ecce enei 0 off Audio error rate threshold 1E 3 Time and Date B 6 GB700 User Manual Default Settings Printer O parallel Print enable esee nenne een nnnnn on Moderna bits o 1 0E 9 SOCIA 1 End of Window repor
211. t press the RATE key two or more times in a row unless you want to change the current error injection mode However while the current error rate is off you can press the SINGLE key as many times as you wish to inject single errors OoOoooovoo 3 To return to the single injection mode press RATE one or more times until ERR OFF is selected ERROR INJECT Input The ERROR INJECT input is a BNC female connector located on the rear panel of the Generator When the error injection mode is set to ERR EXT one bit error will be generated for each rising edge in the signal applied to this input Setup The ERROR INJECT is a 50 ohm ECL input No hardware setup is required GB700 User Manual 4 13 Generator Functions D 4 14 ata Inhibit The DATA INHIBIT input is located on the rear panel of the Analyzer A signal applied to this input may be used to gate off and on the Generator DATA output signal The logic of the DATA INHIBIT function is shown in Table 4 3 The DATA INHIBIT function is not bit or frame synchronized with the DATA output signal Therefore the gating action caused by the DATA INHIBIT input may occur anywhere within a DATA output bit time slot and anywhere within a pattern frame DATA INHIBIT is a standard 50 ohm ECL input and does not require any threshold or delay setup Table 4 3 Data Inhibit Logic Logic Level Applied to DATA INHIBIT INPUT OPEN or LOW DATA output operates normally HIGH DATA output
212. t start with an EDIT_BEGIN command which may have an argument from 1 to 7 An argument of 1 tells the instrument to copy the current word pattern into scratchpad memory while arguments of 0 through 7 tell the instrument to copy the indicated saved word pattern into scratchpad memory 2 The core of a long word editing procedure is constructed from byte commands such as BYTE_BLOCK BYTE_FILL BYTE_INSERT BYTE_EDIT and BYTE_DELETE These commands may be used to download a new pattern into scratchpad memory or to modify a pattern previously copied or downloaded into scratchpad memory 3 All long word byte editing procedures must end with an EDIT_END command This command may have an argument from 2 to 7 An argument of 2 tells the instrument to discard the pattern in scratchpad memory and not to update the front panel An argument of 1 tells the instrument to copy the pattern in scratchpad memory to the current word memory location and to update the front panel Arguments 0 to 7 tell the instrument to copy the pattern in scratchpad memory to the indicated save memory location without updating the front panel Note that a word or byte editing session in a gigaBERT700 Generator or Analyzer can be started locally from the front panel or remotely via the instrument s RS 232 or GPIB remote ports However the instrument will allow only one editing session to be in progress at any given time Saving Word Patterns You can save the cu
213. tage Fuse Type 115 VAC 2 A Slo Blo 230 VAC 1 A Time Delay When replacing a fuse you must use the following procedure 1 Remove the power cord from its wall outlet 2 Remove the power cord from the instrument 3 Pop out the fuse cartridge using a screw driver or similar dull flat bladed tool Install the correct fuse shown the table above into the fuse holder Close the fuse cover Re install the power cord to the instrument Plug the power cord into an AC power outlet 9o NDA Make sure the rear panel power switch is ON You may now power the instrument using the front panel power switch 3 2 GB700 User Manual Common Functions Turning Instrument Power ON OFF The Generator and Analyzer are both equipped with two AC power switches one on the front panel and one on the rear panel In both cases normally leave the rear panel switch in the ON position and use the front panel ON STBY switch to power and de power the instrument GB700 User Manual 3 3 Common Functions LCD Viewing Angle 3 4 The optimum viewing angle of the gigaBERT700 Generator or Analyzer LCD display may be adjusted using the VIEW ANGLE control Each press of the VIEW ANGLE key will raise the optimum view angle until the highest angle is reached The next press of VIEW ANGLE will return optimum viewing angle to its lowest angle and so on GB700 User Manual Common Functions Recalling the Default Setup The default setup
214. tern frame during a byte selected by the user with the PSYNC menu This output may be used to trigger an oscilloscope to view a particular section of the data pattern Analyzer Rear Panel 2 12 The rear panel of the Analyzer contains the auxiliary signal remote control printer and AC power inputs shown below See Chapter 7 for instruction on how to set up the RS 232 and GPIB ports and general information on using printers and external controllers with the Analyzer a ERROR INHIBIT INPUT A signal applied to this input may be used to asynchronously gate on off the error detection function of the Analyzer That is while the signal at this input is low errors are counted While it is high error counting is inhibited GB700 User Manual GB700 User Manual BERT Basics and Feature Overview RZ ERROR OUTPUT One pulse will be generated at this output for each bit error detected May be connected to an external recording device for example to log the exact times that errors occur PRINTER output A one way port that may be connected to a parallel printer that is any printer compatible with the parallel port LPT1 etc of an IBM compatible PC RS 232 C input output A two way serial port that may be connected to an external controller e g a PC or workstation or to a serial printer GPIB input output A two way IEEE 488 compatible I O port that may be connected to an external controller via a GPIB cable 2 13
215. the Analyzer is not in the menu mode you may press their F2 or F3 keys to determine which input is impacted by the INPUT section DELAY TERMINATION and THRESHOLD keys There are three choices Leave both keys off to set up the DATA input turn F2 on to set up the CLOCK input or turn F3 on to set up the REF DATA input Note that you cannot turn both F2 and F3 on at the same time See Chapter 4 for more information on Analyzer setup Print Setup Function Analyzer only You can print a report showing the current setup of the Analyzer by pressing the F4 key This function however is not active in the menu mode Generator CLOCK Section Controls in the CLOCK section of the Generator are used to select clock mode internal or external and to set up the instrument s internal clock The CLOCK section also contains the input connector for an external clock source These controls and input are introduced below C FREQUENCY When this key is selected LED on the clock up down keys may be used to adjust the frequency of the internal Generator clock up or down Each press of the frequency up or down key will increment or decrement frequency by the current step size C STEP Select this key to adjust the frequency adjustment step size from 1 kHz to 100 MHz OU SAVE Use this key to save the present frequency into one of 10 frequency memory locations C RECALL Use this key to recall a previously saved frequency O EXT Press this key to t
216. the Basic Report Setup Procedure has been completed Press F1 to enter the menu system Select the TEST menu F2 Press F1 to see the second page of the TEST menu Select the PRINT parameter to generate an immediate Test report ao fF WON Press F1 multiple times to exit the menu system 5 28 GB700 User Manual Analyzer Functions Result Definitions The following section defines all results calculated by the Analyzer BER and Bit Errors The following two results are calculated by all three Analyzer measurement processes Totalize Window and Test C Bit Errors The total number of bit logic errors counted in the measurement interval May be based on Totalize Window or Test measurement intervals C Bit Error Rate BER Also known as bit error ratio May be based on Totalize Window or Test measurement intervals Equals the number of bit errors divided by the total number of bits in the measurement interval BER TE TB where TE total number of bit errors in the interval TB total number of bits in the interval Note that BER results when included in End of Test or Immediate Test Reports are identified as follows LJ AVE RATE BER calculated over the entire TEST interval CUR RATE BER calculated over the latest WINDOW interval All Other Results Test Intervals Only The following results are calculated over Test intervals only You can view all Test results using the VIEW CUR and VIEW PRE functions i
217. the TEST process is stopped and current results are frozen On the other hand if the TEST character is not blinking that is if it is on steady then the current TEST process is started and new results are accumulating You can start and stop TEST measurements as follows Procedure for Starting the TEST Measurement Process 1 Configure your Analyzer and Generator as desired In particular select a TEST timing mode Timed Untimed or Repeat 2 Use the DISPLAY SELECT key to set the display mode to TEST Verify that the expected TEST character T U or R is shown 3 Ifthe TEST character is blinking press the ERROR DETECTION CLEAR key to stop the TEST process 4 At this point you may press the ERROR DETECTION CLEAR key to start anew TEST process at any time After pressing CLEAR verify that the displayed TEST character is no longer blinking After starting a new TEST interval you may also reset the bit phase and power history indicators by pressing the ERROR HISTORY CLEAR key Regardless of the current TEST timing mode you can stop an active TEST process as follows Procedure for Stopping the TEST Process 1 Use the DISPLAY SELECT key to set the display mode to TEST Verify that the expected TEST character T U or R is shown 2 Observe the TEST character 5 36 GB700 User Manual Analyzer Functions a Ifthe character is on steady then you may stop the current TEST interval by pressing the ERROR DETECTION CLEAR key b
218. the next PRBS pattern Step 17 Repeat steps 13 through 16 for each of the five PRBS patterns Step 18 In the Generator OUTPUT section press the INVERT DATA key The INVERT DATA LED will light Step 19 Verify that the INVERT DATA LED in the Analyzer INPUT section is also on Step 20 Repeat steps 12 through 17 noting that INV is displayed after the PRBS pattern on the Analyzer display GB700 User Manual Customer Acceptance Test Confirmation of Generator Output Data Level Change In this part of the functional test procedure you will verify that the Analyzer threshold responds correctly to the sample values of baseline offset and amplitude in the Generator output The sample values and threshold limits are summarized in the following Data Levels table Repeat steps 21 through 27 for each row of the Data Levels table Note Values in the following table are repeated the purpose of this test is to determine that the gigaBERT700 responds correctly to changes in data level You do not need to read the results except at Step 26 Data Levels Generator Baseline Offset Generator Amplitude Analyzer Threshold Limits 1 00 1 00 0 70 to 0 30 0 30 to 0 70 00D 0 20 to 0 20 DO O D D DO O Step 21 In the Generator OUTPUT section the DATA LED should be on If not press the DATA key The INVERT DATA LED should be off If it is not press the key to turn it off Step 22 Use the Generator BASELINE OFFSET up do
219. the range 0 to 30 LOCAL The LED in this key indicates whether the instrument is in the local mode LED off or remote mode LED on Ifthe LED is on you can return the instrument to local mode by pressing the LOCAL key 2 16 GB700 User Manual BERT Basics and Feature Overview Note that these two keys are used only when operating the instrument via its GPIB port For more information on the GPIB port and remote control in general see Chapter 7 For detailed descriptions of all remote commands see Chapter 8 Pattern Controls and Function Keys The PATTERN section of both the Analyzer and Generator front panels contains two basic types or groups of controls pattern and function The four function or soft keys F1 F2 F3 and F4 have different functions depending on the current mode of the instrument A primary function of these controls is to access and navigate the menu system Pattern controls which includes all other controls in the PATTERN section are used to select edit save and recall test patterns Pattern Controls O PRBS Press this key and then the pattern up down keys to select a PRBS pattern Ol WORD Press this key either to select a word or ROM pattern or to edit the current word pattern QO SAVE and RECALL Use these keys to save and recall user created word patterns to and from non volatile memory The standard gigaBERT700 can store up to eight 16 bit or short word patterns When equipped with t
220. thout charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper user or connection to incompatible equipment or c to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHE
221. to the appropriate RS 232C port on the terminal Note that most terminals and controllers are set up as DTE and therefore use straight through cables 3 Power the instrument Verify that a message using the following format appears on the terminal s display TEKTRONIX BERT700 uu Vx xx mm yy where uu RX if Analyzer or TX if Generator x xx software version number e g 3 00 mm yy month and year of software version If the above message does not appear then one or more of the following problems may exist 1 The cable may be defective 2 You may have selected the wrong cable type Be sure to use a straight through cable if the terminal is DTE or a null modem cable if the terminal is DCE 3 The RS 232C port setup of the instrument baud rate data bits parity etc may not be compatible with that of the terminal Protocol The gigaBERT700 RS 232C port always operates in a non protocol or terminal mode Received characters are stored in a command buffer until a line terminator is received at which point the command is executed immediately While a command is buffered that is before a line terminator is received you may use the backspace key on your terminal to erase the last right most character You may use EVEN or ODD parity to perform error checking on a byte by byte basis In addition if a received command mnemonic is not recognized or if an associated parameter is out of range then the gigaBERT70
222. tor NRZ Data and Clock Output Waveforms 2 3 2 3 Generator Front amp Rear Panels seen 2 5 2 4 Analyzer Front amp Rear Panels eee 2 6 2 5 Generator Displayen siecia sinsear ooi aaronii se eint 2 7 2 6 Analyzer Display piese pte tette entrer eere eie diese 2 8 4 Nominal Generator Clock Data Waveforms showing Amplitude Baseline Offset and Vtop sess 4 6 4 2 Generator Clock and Data Output Equivalent Circuits 4 6 5 1 Analyzer Clock and Data Input Equivalent Circuits 5 7 5 2 TOTALIZE Measurement Process eese 5 15 5 3 WINDOW Measurements Process eene 5 16 5 4 TEST Measurement ProcesS cooooooococcncconocononononononcnnonnnnonanononccncnnnns 5 17 5 5 Example Analyzer Setup Report sese 5 23 5 6 Example End of Test Report 5 24 5 7 Example End of Window Reports eee 5 25 5 8 Example On Error Reports sss 5 26 7 1 Standard Event Status Register SESR ooccccccncnnnononononononononononos 7 15 7 2 Test Status Register TSR oooooccccnnnnonononononononononononononoconononononos 7 16 7 3 Status Byte Register SBR sss 7 17 GB700 User Manual ix Table of Contents List of Tables 2 1 Generator Inputs amp OutputS cocoonconoconccccnnonononocononcnnononannanononacccnnnns 2 14 2 2 Analyzer Inputs a
223. ts esee off Test Measurement Process Test THOU aceto in xt ved a t eo Has eite timed Timed testi it 00 00 30 Test PODOPUG A sid cate eno eae eire diis ON ERROR On Error squelch odi ei ere pras erga off Error threshold e e SEE DU RED E 5 Test report statuss unicas previous Tes State unn a stop GB700 User Manual B 7 Default Settings B 8 GB700 User Manual Options This appendix explains the options available with your gigaBERT700 Generator and Analyzer OPTIONS 1R 1T RakMount This option adds the rack mount assembly to the analyzer and generator OPTIONS 2A 2R 2T 75 ohm Impedance This option changes the nominal impedance of the following gigaBERT700 inputs and outputs from the standard 50 ohms to 75 ohms Analyzer DATA DATA BAR CLOCK CLOCK BAR Generator DATA DATA BAR CLOCK CLOCK BAR The nominal impedance of all other signal inputs and outputs remains 50 ohms OPTION 4S This option adds the pattern editor software GB700 User Manual C 1 GB700 User Manual p Customer Acceptance Test For gigaBERT700 Generator amp Analyzer NOTICE TO ALL PERSONS RECEIVING THIS DOCUMENT THIS DOCUMENT IS ONLY CONDITIONALLY ISSUED AND NEITHER RECEIPT NOR POSSESSION THEREOF CONFERS OR TRANSFERS ANY RIGHT IN OR LICENSE TO USE THE SUBJECT MATTER OF THE DOCUMENT OR ANY DESIGN OR TECHNICAL INFORMATION SHOWN THEREON NOR ANY RIGHT TO REPRODUCE THIS DOCUMENT OR ANY PART THEREOF
224. ut on the SMA connector rather than the cable itself Never tighten an SMA connector nut using more than 10 Ib in of torque Behavior of Outputs Turning Power On or Off When the gigaBEHT 700 Generator is powered or de powered its DATA and CLOCK outputs may saturate to their specified positive or negative rail that is 2 V or 2 V for up to 400 milliseconds If this condition could be harmful to your equipment then remove all connections to your gigaBERT 700 Generator CLOCK and DATA outputs before powering or de powering the instrument GB700 User Manual xiii Table of Contents xiv GB700 User Manual Getting Started This chapter defines the scope of the gigaBERT700 User Guide It also an instrument check out GB700 User Manual 1 1 Getting Started Scope of This User Guide The manual explains how to set up and operate your Tektronix gigaBERT700 Generator and Analyzer Specifically it includes the following Initial check out procedure for your gigaBERT700 Chapter 1 Front rear panel feature overview Chapter 2 Local operation Chapters 3 4 and 5 How to use the menu system Chapter 6 Remote operation and printing Chapter 7 Remote commands Chapter 8 Specifications Appendix A Factory default settings Appendix B Options Appendix C DOODCODODO OC Customer Acceptance Test Appendix D 1 2 GB700 User Manual Getting Started Initial Self Check Procedure You may perform the foll
225. utive seconds in which the BER does not exceed the test threshold 6 20 GB700 User Manual Menu Functions Test Print PRINT Format F1 ESC FA SET F4 TO PRINT TEST RESULTS Menu TEST Function Name PRINT Instruments Analyzer only Options None required This is a standard feature Application Use this function to print a test summary report based on current test results if a test is in progress or previous test results if a test is not in progress Parameters None This is an immediate function Simply press F4 to generate a report or F1 to escape the function without generating a report Notes Make sure the ON OFF function in the PRINT menu is ON if you want to generate a test summary report GB700 User Manual 6 21 Menu Functions Test View Previous VIEW PRE Format F1 ESC F4 SET result name count Menu TEST Function Name VIEW PRE Instruments Analyzer only Options None required This is a standard feature Application Use this function to view results from the last completed test Parameters This is an immediate function After selecting VIEW PRE use the pattern up down keys to scroll through the results shown below START test start time STOP test stop time ELAPSED duration of test TTL BIT total number of bits in interval TTL ERR total number of bit errors counted AVE ERROR RATE BER of TEST interval CUR ERROR RATE BER of WINDOW interval US Unavailable Sec
226. utput signal Min Abbr data_ampl Returns lt NR2 gt 8 40 GB700 User Manual Remote Commands Example data_ampl command DATA_AMPL 1 00 response data_off_up and data_off_dn Data Offset Up Down Default This command pair is used to increment or decrement the current baseline offset of the Generator data output by a default amount of 0 05 volts Min Abbr data_off_u data_off_d Arguments none Example data_off_up data_off_up v and data_off_dn v Data Offset Up Data Offset Down This command pair is used to increment or decrement the current baseline offset of the Generator data output by a specified step size of v volts Min Abbr data_off_u data_off_d Arguments v lt NR2 gt in the range 0 05 to 3 80 in steps of 0 05 Example data_off_up 0 20 data_offset v Data Offset Sets the baseline offset of the Generator data output to a specified value of v volts Min Abbr data_offs Arguments v lt NR2 gt in the range 2 00 to 1 80 in steps of 0 05 Example data_offset 0 50 GB700 User Manual 8 41 Remote Commands data_offset Data Offset Query Returns the current baseline offset of the Generator data output in terms of volts Min Abbr data_offs Returns lt NR2 gt Example data_offset command DATA_OFFSET 0 50 response offset v Offset This command sets the Generator clock and data baseline offset to the same specified value of v volts Min Abbr off Argument
227. when the DATA key is pressed its LED will turn on and the display shows data GB700 User Manual 4 7 Generator Functions 4 8 output amplitude and offset The general procedure for setting data and clock output amplitude and baseline offset is shown below Procedure 1 Press DATA The display will show data output amplitude and offset 2 Press the BASELINE OFFSET up down keys to set the desired data signal baseline offset 3 Then press the AMPLITUDE up down keys to set the desired data signal amplitude 4 Press CLOCK The display will now show clock output amplitude and offset 5 Press the BASELINE OFFSET up down keys to set the desired clock signal baseline offset 6 Then press the AMPLITUDE up down keys to set the desired clock signal amplitude Logically Inverting Output Data The INVERT DATA key may be used to logically invert the output data pattern that is change all 1s to Os and Os to 1s If the INVERT DATA LED is off then the output data pattern is not inverted However if the INVERT DATA LED is on the output data pattern is logically inverted You can toggle the INVERT DATA function on and off by pressing the INVERT DATA key Note that logically inverting the output pattern is the same as swapping the connections to the DATA and DATA BAR outputs Procedure A To toggle output data inversion on or off press the INVERT DATA key Single ended or Differential Operation DATA BAR and CLOCK BAR are compl
228. wn keys to set the baseline offset value shown in the Generator Baseline Offset column of the Data Levels table Step 23 Use the AMPLITUDE up down keys to set the amplitude to the value shown in the Generator Amplitude column of the Data Levels table Step 24 At the Generator select another PRBS pattern using the PATTERN up down keys to initiate a resynchronization by the Analyzer Step 25 Select the PRBS pattern PN7 Step 26 At the Analyzer verify that once the green LOCK LED in the SYNC section lights the displayed threshold is between the limits shown in the Analyzer Threshold Limits column of the Data Levels table Cycle through all five PRBS patterns PN7 PN15 PN17 PN20 and PN23 and verify that the Analyzer synchronizes on each pattern Step 27 At the Analyzer press the CLEAR button in the ERROR HISTORY section to ensure than the SYNC LOSS LED is off GB700 User Manual D 5 Customer Acceptance Test Confirmation of Error Injection Rates a a a Step 28 In the Analyzer ERROR DETECTION section press the DISPLAY SELECT key until there is an infinity symbol on the display preceding the error rate Step 29 At the Analyzer press the CLEAR key in the ERROR HISTORY section and press the CLEAR key in the ERROR DETECTION section to clear the history LEDs and error rate display Step 30 In the Generator ERROR INJECTION section press the SINGLE key and confirm on the Analyzer the BIT LED in t
229. y LCD The Analyzer display in its normal non menu mode is illustrated in Figure 2 6 Figure 2 6 Analyzer Display in Its Normal Non menu Mode FREQUENCY MHz ERROR RATE NUMBER OF ERRORS PATTERN THRESHOLD Like the Generator the Analyzer has a two line by 24 character high contrast liquid crystal display LCD The function of each field in the normal Analyzer display format that is the format used when the Analyzer is not in the menu mode is described below CL The top left section of the Analyzer display is used to show the measured frequency of the input clock signal in MHz For example a display of 622 05 indicates a measured frequency of 622 05 MHz Note that the Analyzer frequency display contains five significant digits while the Generator frequency display contains six This is because the frequency shown in the Analyzer display is a measurement result while the frequency shown in the Generator display is an instrument setup which is known with more precision C The top middle and top right sections of the display normally show measured bit error rate and bit errors respectively BER is expressed in exponential or E notation For example a display of 1 5E 09 indicates a measured BER of 1 5 x 10 9 The Analyzer calculates BER and counts bit errors in three modes simultaneously Window Test and Totalize The symbol in front of the BER field indicates which mode has been selected for display Window results are prece
230. ystem you will see two basic display or page formats menus and functions Menu pages are used to pick a function or another menu by pressing one of the function keys F1 F4 Function pages are used to change one or more setup parameters setup functions or to perform specific actions immediate functions An example setup procedure is presented next to illustrate the use of menus and functions The objectives of this example procedure will be to C Set TEST length to 30 minutes U Set TEST mode to TIMED U Enable On Error and End of Test reports Example Procedure Illustrating Menus and Functions 1 Press F1 to enter the Analyzer menu system At this point you will see the first page of the Analyzer top level menu F1 F2 F3 FA MORE TEST WINDOW WORD GB700 User Manual Menu Functions 2 Press F2 to enter the TEST menu You will now see the second page of the main menu F1 F2 F3 FA MORE LENGTH MODE REPORT 3 Press F2 and you will see the LENGTH function F1 ESC F2 gt F3 F4 SET TEST LENGTH 01 00 00 NOTE Your display may show a different value 4 The TEST LENGTH function allows you to set the length of timed tests in terms of hours minutes and seconds Notice that either the hours minutes or seconds field will be flashing To change the value of the flashing field press the pattern up down keys To change the value of another field use the F2 or F3 key to select this field and then use the pattern

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