Home

Black Box Modem MD885A-R3 User's Manual

1. See notes on page 127 Modem 34336 Table B 1 continued Quick Setup Configurations Default Settings Listed by Mode or Type of Operation 4 WIRE OPTION ASYNC LEASED LEASED ElA RDL DTE Options controlled Disable Disable Disable Disable Disable Disable Disable continued TM to ElA Normal Normal True True True True True Modem CD Level Setup Leased 26 dBm 26 dBm 26 dBm 26 dBm 26 dBm 26 dBm 26 dBm Options CD Level Dial 51 dBm 51 dBm 51 dBm 51 dBm 51 dBm 51 dBm 51 dBm TX Level Leased 0 dBm OdBm 0dBm 0dBm OdBm OdBm 0dBm TX Level Dial Permis Permis Permis Permis Permis Permis Permis Signal Quality Level 1043 1043 1043 1043 1043 1043 1043 Compromise Equalizer T III T III T III T III T III T II T III Trellis Code Enable Enable Enable Enable Enable Enable Enable Transmit Clocking Internal Internal Internal Internal Internal Internal Internal T1 Timer 0 8sec 0 8 sec 0 8sec 0 8 sec 0 8 sec 0 8sec 0 8 sec Auto retrain Enable Enable Enable Enable Enable Enable Answer See Originate ORIG note 2 ORIG ORIG Answer Tone 2100Hz 2100Hz 2100Hz 2100Hz 2100Hz 2100Hz 2100Hz Front Panel Enable Enable Enable Enable Enable Enable Enable Speaker Control Till CD Till CD Till CD Till CD Til CD Till CD Till CD Speaker Volu
2. See notes on page 127 APPENDIX B Quick Setup Configurations Table B 1 continued Quick Setup Configurations Default Settings Listed by Mode or Type of Operation V 25 bis 2 WIRE 4 WIRE BELL OPTION HAYES ASYNC DUMB LEASED LEASED V 33 208 Address 999 999 999 999 999 999 999 999 999 999 999 999 999 999 Dialer Hayes V 25 bis OFF OFF OFF OFF OFF Mode Async Auto Answer Enable Enable Enable Disable Disable Disable Enable Data Data Format Async Async Async Sync Sync Sync Sync Format Options Character Length Parity None None Disconnect RX Space Options Disconnect Enable Enable TX Space Disconnect Enable Enable Enable Enable Enable Enable Carrier Disconnect Enable Enable Enable Enable Enable Enable Enable Line Current Disconnect Enable Enable Enable Enable Enable Enable Enable RTS Disconnect OFF OFF OFF OFF OFF OFF OFF Test DSR During Options ALB ON ON ON ON ON ON ON Remote Test Enable Enable Enable Enable Enable ElA CTS to ElA True True Normal Normal Normal Normal Normal Options CD to ElA Normal Normal Normal Normal Normal Normal Normal DSR to EIA True Normal Normal True True True Normal DTR from EIA Normal Normal Normal True True True Normal ALB DET controlled Disable Disable Disable Disable Disable Disable Disable
3. etc may be used for passwords entered with the DTE interface but these characters cannot be entered with the Modem s front panel A phone number cannot be stored after Only one command A P or U can be stored in each memory location Do not leave a space after a command When using the U command do not include spaces or control characters in the specified text string The following instructions explain how to use the password commands 1 Establishing or changing the administrative password For greatest security you should use an administrative password Ifimplemented the administrative password controls access to the Hayes compatible amp and amp Z commands The commands are required to view or modify the modem s security configuration as explained in the following sections To establish or change an administrative password enter the following command replacing SECURITY with your password AT amp Z1 ASECURITY NOTE The administrative password may be stored only in memory location 1 The command line including AT amp Z1 cannot exceed 40 characters 4 0 General Operation and Special Features 2 Unlocking the amp V and amp Z commands If an administrative password is implemented the Hayes compatible amp V and amp Z commands cannot be accessed unless they are first unlocked using the current administrative password amp V is used to view the active modem configuration stored p
4. Modem 34336 2 Option Selection Example The following example illustrates option selection As you follow the steps below refer to the LCD flow chart SETUP OPTIONS side at the back of this manual When you are finished you can easily restore default settings for the type of application you are using by selecting the appropriate Quick Setup see Section 2 3 Quick Setup The example shows how to change the volume of the modem s speaker from LOW or HIGH the default setting to MEDIUM To make this adjustment locate the SPEAKER VOLUME screen on the LCD Access MAIN MENU screen 2 then SETUP screen 4 Finally access MODEM SETUPS screen 5 The steps are explained in detail below After powering on the modem press ENT to get the first screen of the MAIN MENU Press the right arrow pushbutton to go to screen 2 of the MAIN MENU shown below MAIN MENU lt 2 gt SETUP TEST RMT Press pushbutton 1 to access the first page of the SETUP menu shown right Press the right arrow pushbutton three times to display SETUP screen 4 shown left Press pushbutton 3 to select MODEM i pa Ste for MODEM SETUPS The first TXLVL MODEM SETUPS screen is shown right MODEM SETUPS lt 5 gt Press the right arrow pushbutton four oe SEN ee times to reach MODEM SETUPS screen 5 shown left 3 0 Modem Setup Options Press pushbutton 3 to select SPKVOL speaker vol
5. 5 4 2 PROFILE 0 AND PROFILE 1 User Profile 0 is linked to the Modem s front panel 1 selections made using the front panel LCD If you make option changes using the front panel the option changes for which there are associated Hayes commands are saved to profile 0 when you exit the SETUP menu 5 0 Hayes Emulation Mode e If profile 0 is recalled as the active configuration the LCD screens reflect the profile 0 configuration If profile 0 is changed by means of Hayes commands or via the Summary Setup feature and then saved the changes made are reflected on the LCD and are effective for all modes If you make option changes from the front panel without exiting the SETUP menu and then make option changes using Hayes commands and use the amp W command to save them to profile 0 the changes saved to profile 0 override the front panel selections User Profile 1 is not linked to the front panel Option changes made from the front panel are not saved to profile 1 Profile 1 can be changed only by using Hayes commands or the Summary Setup feature e If profile 1 is recalled as the active configuration the LCD screens are not affected When profile 1 is active it is possible for the LCD to display an option setting not reflecting the setting currently in effect If profile 1 is changed by means of Hayes commands or via the Summary Setup feature the changes are not reflected on the LCD and only affect Hayes mod
6. Appendix C Summary Setup MISCELLANEOUS OPTIONS NOTE misc1 and misc2 are displayed to help indicate the relative positions of individual options across the LCD The dashes are shown in this example to help indicate the relative positions of these three particular options across the LCD misc1 misc2 1230000 0100 EN Multimode handshake O T1 timer 1 V 32 bis Annex A Answer tone detection O disable 1 enable ALB make busy O disable 1 enable V 13 operation O off 1 TX only 2 RX only 3 TX and RX DTE DCE speed O disable 1 enable V 25 bis DTR dialing O disable 1 enable Operating mode fallback O Bell 212A and Bell 103 1 V 22 V 21 V 23 Remote test O disable 1 enable DSR during ALB O disable 1 enable FP O disable 1 enable LCD intensity 0 1 7 7 greatest intensity Speaker volume 0 low 1 medium 2 high Speaker control O off 1 on till CD 2 on 3 off during dialing VY Modem 34336 C 3 AT PROFILES Screen From the AT PROFILES screen you can select a Hayes mode configuration profile either 0 or 1 Only part of the profile can be displayed at one time The selected profile is used as the active configuration and is also designated as the default user profile e Press pushbutton 1 to select profile 0 Press pushbutton 2 to select profile 1 Press pushbutton 3 to toggle between profile 0 and profi
7. Front panel selection the easiest and most commonly used method for selecting individual options You can select an overall configuration via Quick Setup and then change selected options from the front panel to suit your application To make changes access individual option screens on the front panel LCD Make selections using the control pushbuttons Summary Setup the fastest way to selectively change options All options are accessed using a few of the LCD screens These screens show numerical codes with very little explanation Therefore Summary Setup is recommended for experienced users only Summary Setup is explained in Appendix C TRANSMITTER RECEIVER PATTERN PATTERN GENERATOR DETECTOR Figure 3 1 LCD Pushbuttons Modem 34336 3 2 Selecting Options from the Front Panel 3 2 1 PUSHBUTTONS AND THE LCD Options are selected from the front panel by pressing the front panel pushbuttons Figure 3 1 The possible choices for each option are shown on the liquid crystal display LCD and on the flow chart at the back of this manual 1 Arrow Pushbuttons Use the left arrow and right arrow pushbuttons to display additional or previous pages screens of a menu The right arrow pushbutton displays an additional menu page if there is one the left arrow pushbutton displays the previous page of a menu With respect to how the LCD flow chart is set up the arrow pushbuttons move you either right or left within the cha
8. 4 9 3 RESPONSES TO DIAGNOSTIC PORT COMMANDS In response to the diagnostic port commands listed in Table 3 3 the Modem may display the responses listed in Table 4 4 on the DTE monitor Modem 34336 Table 4 4 Responses To Diagnostic Port Commands RESPONSE ERROR Command error incomplete wrong syntax etc If CONNECT or CON is issued without an address or the modems will not connect and there will be no ERROR message ADDRESS g u The Modem has connected with diagnostic port of modem at address g u group and unit Address may be preceded by A S or both see below One or more modem alarms has been detected An alarm indicates a condition that may require attention power loss loss of carrier etc Valid statistics have been collected on a call or attempted call Statistics include information such as call duration call signal quality level etc Response to RESET command Prompt gt appears when reset is complete 4 0 General Operation and Special Features 4 9 4 DTE DISPLAYS When Auto Display is enabled an update of the LCD is automatically displayed on the DTE screen each time a command E 1 2 3 left arrow or right arrow is entered to control the front panel LCD on the connected modem Auto Display is enabled when the long form connect command CONNECT is used Auto Display is disabled when the CON command is used However even with Auto Displa
9. V 42 bis error correction LAPM with data compression is active MNP 01 to MNP 05 MNP error correction is active BUFFER Buffer mode is active OFFLINE Modem is off line Rate Shows the data rate of the DTE Modem 34336 7 7 Local Modem Diagnostics Local modem diagnostics are for testing the Modem and its adjoining system The tests are accessed from the main menu and are easily performed if the Modem is attached to DTE or an external BERT 7 7 1 ANALOG LOOPBACK ALB TEST Analog loopback testing allows you to test the local modem and its associated terminal independently from the telephone interface and the remote modem Figure 7 1 shows the connections automatically made during the test TRANSMITTER RECEIVER gt A E C LOCAL MODEM DATA TERMINAL EQUIPMENT DTE AT LOCAL SITE Figure 7 1 Analog Loopback Test 7 0 Diagnostics In Hayes emulation mode only initiate the ALB test using the command amp T1 preceded by AT In any mode initiate the ALB test using the modem s front panel controls explained in the following paragraphs Make sure the modem is idle the data rate is the same as the DTE s data rate and the DTR circuit is on If TR is present on the EIA status screen the DTR circuit is on From the second page of the LCD MAIN MENU select TEST TEST takes you to screen 1 of the LOCAL TEST menu where ALB is displayed as one of the test selections Select ALB
10. BL ACK BOX MD885A R2 MD885A R3 MD885AE R2 MD885C R2 601745301 Rev A Modem 34336 NOTE All models include the modem 1 leased line cable 1 dialup phone cable and this user manual The MD885A R2 MD885AE R2 and MD885A R3 include a power supply The MD885A R3 also includes 1 10 ft RS 232 cable and 1 DB9 F to DB25 M adapter o nn ng ng ce nn e e e Js a CUSTOMER Order toll free in the U S Call 877 877 BBOX outside U S call 724 746 5500 SUPPORT FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 INFORMATION Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com FCC Information FEDERAL COMMUNICATIONS COMMISSION AND INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates uses and can radiate radio frequency energy and if not installed and used properly that is in strict accordance with the manufacturer s instructions may cause interference to radio communication It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC rules which are designed to provide reasonable protection against such interference when the equipment is operated in a commercial environment Operation of this equipment
11. Figure 7 6 allows testing of the local modem remote modem and telephone line from the local site In Hayes mode only initiate the RDL test using the command amp T6 preceded by AT In any mode initiate the RDL test from the Modem s front panel Both modems should be on line and should be tested at the DTE s data rate Ensure that the circuit is on If TR is present on the EIA status screen the DTR circuit is on RECEIVER TRANSMITTER DATA TERMINAL EQUIPMENT DTE AT LOCAL SITE REMOTE MODEM Figure 7 6 Remote Digital Loopback Test RDL 7 0 Diagnostics From page 2 of the MAIN MENU select RMT Then select TEST From the REMOTE TEST menu select RDL From the REMOTE DIGIT LOOP screen select ON to activate the test The status screen is displayed as the test is being conducted Make sure that test data is being generated and watch for data errors By transmitting test data and comparing it with the received copy you can make sure the Modems and the telephone line are working To end the test press the ENT pushbutton to return to the REMOTE DIGIT LOOP screen Then select OFF 7 8 2 REMOTE DIGITAL LOOPBACK SELF TEST RDLST The RDLST allows testing of the local modem remote modem and telephone line from the local site as did the previous test However test data is generated by internal modem circuitry as opposed to a DTE or external BERT Figure 7 7 shows the connections automatically made during the
12. The MNP Class Limit is available for Hayes V 25 bis Dumb Leased Line modes except V 33 This option is effective only when MNP error correction is active It limits MNP operation to the selected MNP class or lower MNP classes 1 5 are available In general the higher MNP classes provide the most throughput efficiency Class 5 the default can provide as much as 2 to 1 data compression over the transmission link 3 0 Modem Setup Options The following two options are available through the V42 SELECTION screen The Protocol option is available for Hayes V 25 bis Dumb and Leased Line modes except V 33 LAPM MNP The Modem attempts to establish a connection using the V 42 link access protocol LAPM MNP This is the primary error correction protocol under the CCITT V 42 standard If such a connection cannot be established because the other modem does not support LAPM or is not configured for LAPM the Modem attempts to establish a connection using MNP Class 5 as the fallback error correction protocol NOTE When operating in LAPM mode the Modem uses V 42 error correction unless V 42 bis is enabled via the V 42 bis option V 42 and V 42 bis error correction both use LAPM LAPM ONLY The modem only attempts to establish an LAPM connection will use only V 42 or V 42 bis error correction MNP ONLY The modem will only attempt to establish an MNP connection NOTE If a connection cannot be established u
13. The Return option setting must be the same on both communicating units If the Return option is enabled gt gt 10 40 60 or 120 seconds the Test Interval selections control how frequently the Modem tests the leased line conditions to determine if exit from the Leased Line Auto Recovery mode is desirable Exiting is based on the criteria selected for return from Auto Recovery The Modem can be set to test every 10 20 40 or 60 minutes NOTE The Test option setting must be the same on both units 4 4 Dial Line Auto Recovery The Dial Line Auto Recovery feature allows you to set up the Modem for a dial up application so it automatically redials to restore a broken connection if the modem goes on hook In this way the Dial Line Auto Recovery feature emulates the reliability of a leased line connection 4 4 1 SETTING UP THE MODEM FOR DIAL LINE AUTO RECOVERY Two steps are required to set up the Modem for Dial Line Auto Recovery First enter or store the number to be dialed with the R command Then enable Dial Line Auto Recovery To configure the Modem for Dial Line Auto 4 0 General Operation and Special Features Recovery from the front panel enter the phone number to be dialed followed by R the Dial Line Auto Recovery command on the PHONE screen shown below T555 4545 R DEC CTRL I If you need assistance see Section 4 2 An alternate way to configure the Modem for Dial Line Auto Recovery in Haye
14. amp command e amp V View Active Configuration etc This command displays the active modem configuration user profiles stored using the amp W command and phone numbers stored using the amp Z command When amp V is invoked the DTE displays the configuration commands last issued including parameters used and the values currently stored in the S registers The amp V command should be issued as the last command on a line e amp W Write Profile To Memory The amp W command saves the storable parameters of the Modem s active configuration by writing the configuration profile to non volatile memory By selecting either amp W0 or amp W1 two different user profiles can be saved profile 0 or 1 One of these profiles is automatically restored whenever the modem 18 powered on or when the Z command is issued See amp and Z commands The amp W command cannot be used to write changes to the user profiles if the Modem s front panel is disabled with the Front Panel Control option The parameters listed below cannot be stored all are set by changing S register values as indicated in Table 5 3 Backspace character 5 08 Carrier detect response time Carriage return character ASCII 13 DTMF tone duration DTR detection Escape sequence character ASCII 43 Escape sequence guard time Line feed character ASCII 10 Lost carrier until hangup time Pause duration effected by comma Modem 34336 Ring
15. change the address use the right and left arrow pushbuttons to go to the digit you want to change Then use pushbutton 1 to decrease DEC a number and pushbutton 3 to increase INC it The default address is 999 999 3 3 2 DIALER MODE Several Dialer Mode options can be selected from the DIALER and DIAL V25bis screens The Dialer Options are available for all modes OFF The autodialer is off meaning the modem operates in Dumb mode only Calls must be made using the front panel AUTO DIAL function or they must be manually originated HAYES The autodialer automatically dials previously stored phone numbers and the modem responds to Hayes commands This selection enables dialing an option that allows you to set up the Modem to automatically dial a stored number even when the autodialer is not enabled For further information see Section 4 5 3 0 Modem Setup Options The V 25 bis Dialer Modes are available for V 25 bis mode Any of the selections from the DIAL V25bis screen will enable the V 25 bis autodialer For detailed information on the V 25 bis autodialer see Chapter 6 The three selections on the DIAL V25bis screen allow you to select a data protocol that is appropriate for the DTE the Modem is connected to ASYNCHRONOUS Asyn SYNCHRONOUS CHARACTER ORIENTED Syn c SYNCHRONOUS BIT ORIENTED Syn b NOTE DTR dialing for V 25 bis mode cannot be enabled through the DIALER
16. the status screen displays an IDLE message If a loopback is present handshake sequence codes appear followed by the modem speed If ER is present on the front panel data errors occurred The ER indicator may flash on when the test is first turned on but it should quickly go out and remain off until the end of the test The information at the end of the previous section for the ALBX test concerning signal loss loss of carrier and loss of RTS also applies to the ALXST To end the test press the ENT pushbutton to return to the ANALOG ST EXT screen Then select OFF 7 7 6 DIGITAL LOOPBACK TEsT DLB Digital loopback testing determines the operational performance of the local modem the remote modem and the telephone line as a composite system For the test data must be sent and received at the remote modem The test regenerates the data and loops it back to the remote modem As with the ALB test a comparison of the results of the DLB test indicates whether or not the DTE is performing satisfactorily A comparison of the results of the ALB and DLB tests can help determine whether the modem or the telephone line is defective In the DLB test the data to be sent and received is originated and checked by the DTE or external BERT Figure 7 5 shows the data flow for this test In Hayes mode only initiate the DLB test using the command amp T3 preceded by AT In any mode initiate the DLB test using the modem s front panel contr
17. 1 start bit 7 data bits and 1 or more stop bits 10 BITS 1 start bit 8 data bits including parity and 1 or more stop bits 11 BITS 1 start bit 9 data bits including parity and 1 or more stop bits In Hayes mode character length is set automatically under most conditions The Parity option is available for all modes Parity selections are effective only if error correction or buffer mode has been enabled or if the Modem is in 2 Wire Dial Hayes mode For most applications parity should be set to NONE The following parity options are available NONE no parity ODD EVEN MARK parity is always 1 and SPACE parity is always 0 All parity settings except NONE automatically enable parity conversion except in Hayes mode meaning that the parity of received data is converted to match the selected parity option In Hayes mode parity is set automatically under most conditions 3 0 Modem Setup Options 3 3 4 DISCONNECT OPTIONS When the modem is operating in V 25 bis or Dumb mode it is necessary to disconnect the modem from the telephone circuit once communications are completed The most common form of disconnection is by dropping the Data Terminal Ready DTR signal from the DTE However some applications may require one of the five available automatic disconnect methods listed below For all five disconnect options disabled means the modem will not disconnect in the presence of the conditions specified below Th
18. 7 7 5 EXTERNAL ANALOG LOOPBACK SELF TEST ALXST The external analog loopback selftest is available for 4 wire leased line mode only The ALXST places the modem in analog loopback and causes data to be sent and received by an internal 511 bit pattern generator and receiver No DTE or external BERT is necessary As shown in Figure 7 4 the test circuit includes the leased lines the external loopback NOTE The ALXST may result in errors or may fail altogether even where conditions are satisfactory for normal operation The test channel presented to the modem during the ALXST includes all impairments of both the inbound and outbound channels amplitude distortion delay distortion noise etc The main purpose of the ALXST is to verify that the modem is connected to the leased line and the leased line circuit is complete The test is not meant to assess the suitability of the leased line TRANSMITTER RECEIVER PATTERN PATTERN GENERATOR DETECTOR Figure 7 4 External Analog Loopback Self Test ALBST Modem 34336 To initiate the ALXST use the Modem s front panel controls to go to the LCD MAIN MENU From page 2 of the LCD MAIN MENU select TEST Go to the second page of the LOCAL TEST menu Select ALXST The ANALOG ST EXT screen is displayed with ON and OFF as the possible selections Select ON to activate the test The EIA status screen is displayed while the test is being conducted If no external loopback is present
19. From A Diagnostic 75 Modem 34336 4 10 Automatic Fallback erre tete retten 76 4 10 1 Operating Mode Fallback eee 76 4 10 2 W 52 Speed Fallback is 78 e ete 80 5 0 Hayes Emulation Mode 7 81 21 Hayes Mode Auto dialer iia 81 5 1 1 Enabling The Hayes Mode Autodialer sees 81 5 1 2 Command Guidelines 81 BAS Result Godes retener yeye 84 bf Transmission Speed itte tnter e eee 84 5 2 Hayes Compatible Commands see 84 9 9 29 REPISTETS ER 90 5 3 1 Reading And Setting Registers sse 86 5 8 2 S Register Functions ee 86 5 4 Selecting Options In Hayes Mode 1 94 5 41 Saving Option Selections em mmt 94 5 12 ProhlileOand Profile 1 94 5 5 Hayes Mode Reference Tables 95 6 0 V 25 bis Autodialer 1 eee 107 6 1 Enabling The V 25 bis Autodialer esee 107 6 2 V 25 bis Autodialer Commands een 108 6 3 Dialing Parameters i ener incor rca 112 6 4 V25 bis Result siii Mee eda oue cS ER MEE done 112 6 5 DIR Dialing In V 25 bis Mode enne 112 TW Diagnostics m 113 FA When And Why To Test uerit ne
20. Hayes dialing mode also resets modem configuration Request list of all stored numbers represents a number to be dialed or stored e g 5557979 m represents a memory address where a number is stored 0 9 A comma can be included in a dial string to effect a pause A colon can be included to instruct the autodialer to wait for a dial tone before proceeding 6 0 V 25 bis Autodialer Table 6 2 V 25 bis Dialing Parameters Table also applies to Dumb mode and Bell 208 operation Characters that can be dialed 0 9 Can only be tone dialed A C D and L Links a phone number to another number to be dialed as an alternate when the primary number is busy or does not answer See L LINK in Section 5 2 P Sets pulse dialing mode Sets tone dialing mode W or colon Wait 30 seconds for dial tone before proceeding CR or Required at end of dial command line carriage return CR is sent from DTE keyboard or period Dumb 208 mode only Period has same function but may be entered via front panel PHONE LCD screen comma Pause before processing next or lt character in dial string L P T and W may be entered as upper or lower case letters Spaces or hyphens may be used as separators for clarity they have no effect Modem 34336 6 3 Dialing Parameters Table 6 2 lists dialing parameters you can use with the CRN command to modify dialing operat
21. It can be set to LOW MEDIUM or HIGH The Guard Tones option is available for Hayes V 25 bis Dumb modes Guard tones are used in V 22 and V 22 bis modes only to assure proper band separation on systems that use international telephone circuits Unless you are using international circuits in one of these modes you should turn the guard tone option OFF If guard tones are required their frequency can be set to 550 Hz or 1800 Hz the most commonly used guard tone frequency V 13 Operation is available for V 25 bis Dumb and Leased modes synchronous operation only OFF V 13 operation is off This setting allows normal full duplex operation All other selections are for enabling V 13 operation TX ONLY Status of RTS will be sent to remote modem RX ONLY Carrier Detect CD will be controlled by V 13 signals from the remote modem TX AND RX Status of RTS will be sent to remote modem and CD will be controlled by V 13 signals from the remote modem To select one of the four V 13 options press pushbutton 1 or 3 with the V13 screen displayed until the selection you want is displayed For half duplex point to point applications select TX AND RX For multidrop applications select RX ONLY for all modems at the host site and TX ONLY for all modems at the remote site For further information on V 13 operation see Section 4 10 3 3 8 V 33 AND BELL 208A B OPTIONS The following three options are available on t
22. The ANALOG LOOPBACK screen is displayed with ON and OFF as the possible selections Select ON to activate the test In general the DSR during ALB test option discussed in Chapter 3 should be left ON default selection to avoid disrupting the DTE and DTE software operations The EIA status screen is displayed while the test is being conducted Make sure that test data is being generated Watch for data errors By transmitting test data and comparing it with the received copy you can make sure the DTE and modem are both working To end the test press the ENT pushbutton to return to the ANALOG LOOPBACK screen and then select OFF 7 7 2 ANALOG LOOPBACK SELF TEST ALBST In the analog loopback self test the modem is placed in analog loopback and data is sent and received by an internal 51 1 bit pattern generator and receiver Therefore no DTE or external BERT is necessary Figure 7 2 shows the data flow for this test In Hayes mode only initiate the ALBST using the command amp 8 preceded by AT In any mode initiate the ALBST using the modem s front panel controls as follows From page 2 of the LCD MAIN MENU select TEST This takes you to screen 1 of the LOCAL TEST menu where ALBST is visible as one of the selections Select ALBST Modem 34336 829 Block External loopback leased line Pattern Pattern generator detector Figure 7 2 Analog Loopback Self Test ALBST The SELFTEST screen is disp
23. a training sequence and wait for a training response from the remote modem The modem will repeat the training sequence every 1 2 seconds until the remote modem responds When the local modem has established a connection with the remote unit the TIE EIA status screen will appear NOTE For point to point 4 wire leased line V 29 operation the Auto Retrain option should be enabled on both modems Auto Retrain is enabled by default if you select the 4 wire Leased Line V 29 Quick Setup If the Auto Retrain option is disabled the modem will not transmit a training sequence and will instead train on the data stream from the remote modem Disabling Auto Retrain in 4 wire leased line V 29 mode is recommended for test purposes only If Auto Retrain is disabled it should be disabled on both modems V 34 V 32 Dial Backup NOTE Dial backup can only be used in point to point applications To prevent service interruption in the event of poor leased line conditions the modem can be configured for V 29 leased line operation with V 34 V 32 dial backup This means the modem will use dial lines to automatically restore operation when conditions on the leased lines deteriorate Use V 34 or V 32 modulation for dial backup To set up the Modem for V 29 leased line operation with dial backup follow these steps 1 Select the 4 wire leased line V 29 4 WLL V 29 Quick Setup on both the local and remote modem 2 One modem must be set to originate
24. amp Q Modem displays OK result code command has no other effect The pulse dialing ratio is factory set depending on whether the modem is a U S or international model Asynchronous Synchronous Mode amp QO Asynchronous mode amp Q1 Synchronous mode 1 Synchronous asynchronous mode amp Q2 Synchronous mode 2 OFF to ON DTR causes Modem to automatically dial a stored number amp R RTS And CTS Options amp RO CTS follows RTS CTS follows DTR from the DTE CTS is on while the modem is on line Data Set Ready Control DSR always on DSR operates according to RS 232 specification Options DSR operation for a crossover connection Default settings where applicable are in bold face f user profile 1 is active options are controlled for Hayes mode operation by given commands or Summary Setup Do not change via front panel except via Summary Setup 5 0 Hayes Emulation Mode Table 5 1 continued Hayes Compatible Commands COMMAND FUNCTION EXPLANATION Test Commands Terminates a test in progress amp TO must be the last command in a command line Initiates a local analog loopback test Initiates a local digital loopback test Allows the local modem to accept a request from the remote modem for a remote digital loopback test Prevents the Modem from accepting a request from the remote modem for a remote digital loopback test Initiates a remote digital loopback test Initiates a remote digital l
25. and manual originate answer dial operation It sets the Modem to default to either answer or originate status ANSWER Sets the Modem to answer mode ORIGINATE Sets the Modem is set to originate mode The Answer Tone option is available for Hayes V 25 bis and Dumb modes The answer tone frequency is selectable only if the maximum data rate is set to 1200 bps via the SPEED LIMIT menu in which case the answer tone can be set to either 2225 or 2100 Hz Otherwise the answer tone frequency is 2100 Hz the standard for V 32 operation In general this setting should not be changed even for fallback with Bell standard modems which use a 2225 Hz answer tone The Front Panel Control option is available for all modes It controls the use of the front panel If disabled the front panel of the modem will not respond to changes to the Setup menus Front Panel Control is a security feature helpful in situations where it is undesirable for the modem s configuration to be changed Two speaker options are available Speaker Control and Speaker Volume The Speaker Control option is available for all modes ON Speaker is on during the full modem handshake process and while the unit remains on line OFF The speaker is off the call cannot be audibly monitored ON TILL CD Speaker remains on until a carrier signal CD is detected 3 0 Modem Setup Options The Speaker Volume option is available for all modes
26. by the minimum and maximum rate settings of the Speed Limit option If satisfactory performance cannot be attained at any of the available data rates the Modem will initiate a GSTN cleardown line disconnect If the originate modem attempts to negotiate a rate that is lower than the minimum rate setting of the answer modem the answer modem will initiate a GSTN cleardown How to Enable or Disable RRP NOTE RRP will function only if Speed Fallback is enabled factory default and if the V 32 Mode option is set to V 32 bis factory default Both functions are Summary Setup options The factory default setting for RRP is enabled To change the RRP option refer to the DATA PUMP OPTIONS diagram in Appemdix C Change the Rate Renegotiation Procedure RRP parameter shown in the diagram to 0 disable or 1 enable This is the only way the RRP option can be changed Rate Change Screen If V 32 bis mode and the Rate Renegotiation Procedure RRP option are both enabled the Modem will automatically adjust during data transmission to a higher or lower data rate depending on the receive signal quality For diagnostic purposes the RATE screen accessed from screen 3 of the MAIN MENU as illustrated below may be used to manually initiate speed renego tiation from the front panel as explained below NOTE The RATE screen is only displayed if V 32 bis mode is enabled via Summary Setup V 32 Mode option If you select DOWN from the RATE
27. command a pointer is set to the address of register S7 AT S7 As long as no other 5 command is entered the register value can be requested at any time without specifying the number If you enter AT the modem displays the current value in the S7 register Similarly if you enter AT 8 the modem changes the value in the S7 register to 8 5 3 2 S REGISTER FUNCTIONS This section describes the function of each S register Table 5 3 lists the range of possible parameters and the default value for each 5 register S0 Ring To Answer On The value in this register determines on what ring first second third etc the modem answers Setting SO to 0 disables auto answer 1 Ring Count Register S1 counts the number of ring signals for each incoming call If more than 8 seconds pass since the last ring Sl is cleared to zero 52 Escape Code Character The escape code is effective for asynchronous operation only Values greater than 127 completely disable escape code detection and prevent you from issuing a hang up command Modem 34336 S3 Carriage Return Register S3 is effective for asynchronous operation only Normally the ASCII carriage return value 13 is used S4 Line Feed This register is effective for asynchronous operation only The line feed character follows the carriage return only when word result codes are selected command V1 Line feed can be changed to a null but cannot be totall
28. connection Both cables have an eight pin modular connector RJ 45 on one end and a six pin modular connector RJ 12 on the other end You will need to use both of the supplied cables if you want to use the Modem for Leased Line Auto Recovery which requires both a leased line and dial line connection The MD885A R2 MD885AE R2 and MD885A R3 include a power supply The MD885A R3 package also includes additional cables e 1 10 ft RS 232 cable e 1 DB9F to DB25 M adapter 2 1 3 WHAT You WILL NEED e You will need an EIA RS 232 interface cable supplied with the MD885A R3 not supplied with the MD885A R2 MD885AE R2 or MD885C R2 to connect the Modem to a DTE data terminal equipment usually a computer 2 0 Quick Start If you are operating the Modem in a manual dial mode you also need a standard telephone set 2 1 4 CONNECTIONS Figure 2 1 shows how the Modem is connected to the computer or terminal AC power supply phone lines and handset Do not install the modem more than 50 feet 15 2m from the DTE the EIA standard maximum length for interface cable For DTE speeds greater than 19 2 Kbps a shorter low capacitance DTE interface cable should be used Call technical support for information on which cable will support your application For all applications Connect your RS 232 cable to the rear panel DB25 connector labeled DTE Connect the other end to your computer or other DTE e Attach the power
29. except for line type and modem answer originate status Use Quick Setup 9 if the leased line is a 4 wire line and you want to configure the Modem as the answer modem V 33 LEASED LINE OPERATION This Quick Setup configures the Modem for V 33 operation This provides compatibility with V 33 modems 2 WIRE DIAL BELL 208 OPERATION This Quick Setup configures the Modem for 2 wire dial operation compatible with Bell standard 208B 2 WIRE DIAL V 32 208 AUTO DETECT MODE This Quick Setup configures the Modem to automatically select V 32 bis V 13 or Bell 208 operation depending on the mode of the originating modem 4 WIRE LEASED LINE V 29 MODE This Quick Setup configures the modem for V 29 operation for compatibility with V 29 modems V 29 FAST MASTER MODE This Quick Setup con figures the modem for V 29 fast train master operation for use in a multidrop network where multiple remote slave modems share the master Modem as the host modem V 29 FAST SLAVE MODE This Quick Setup configures the modem for V 29 fast train slave operation for use in a multidrop network where multiple remote slave modems share the same host master modem Modem 34336 2 4 Basic Operation This section provides basic information for each of the modem s primary operating modes If you encounter difficulty refer to Section 2 5 Problem Solving 2 4 1 2 WIRE Diar HAYES MODE Quick SETUP 1 Two Wire Dial Hayes mode is the
30. factory default configuration for the Modem Hayes mode operation and commands are explained in detail in 5 0 Hayes Emulation Mode Dialing a Phone Number To dial a telephone number in Hayes mode type the Hayes command AT D on your computer or terminal keyboard followed by the number you want to call and cr Example AT D 5551212 cr Dashes or spaces may be included for clarity but they are not necessary The Modem ignores them A carriage return cr is required at the end of each command On most keyboards the carriage return cr key is labeled Enter or Return In response to the command line shown above the Modem will dial the number 555 1212 If you need an access code such as 9 to dial out of your building insert the access code and a comma in the dial string AT D 9 5551212 cr The Modem pauses for 2 seconds at the comma This allows the Modem to wait for a second dial tone after the access code before dialing the number 2 0 Quick Start Dialing Mode The default dialing mode is tone dialing To change to pulse dialing insert a P after AT D AT DP To change from pulse dialing to tone dialing insert a T after AT D AT DT The specified dialing mode remains active until the alternate mode is specified or the modem is reset Connected When a phone number is successfully dialed a CONNECT message appears on the computer screen and the LCD on the Modem displays a status screen simi
31. in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio Interference Regulation of Industry Canada Le pr sent appareil num rique n met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de la classe A prescrites dans le R glement sur le brouillage radio lectrique publi par Industrie Canada TRADEMARKS USED IN THIS MANUAL Hayes is a registered trademark of Hayes Microcomputer Products Inc Microcom Networking Protocol and MNP are registered trademarks of Microcom Systems Inc Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners Table of Contents 1 0 Specifications RT 6 2 0 Quick Statt eR 8 JustallatiOn AAA ON 8 2 11 Unpacking ertet cilindrada 8 21 2 Package CODtenlts ceres op rrt tO THEE Ee lan 8 2 1 3 What You Will Need eerte ttti temet entire e 8 213 A E crees EAA 8 2 15 asian 10 2 2 Front Panel LCD And Control
32. is not enabled the V 42 circuit functions as a buffer between the DTE and the modem and provides transmission speed conversion DISABLE Speed conversion is not allowed The DTE Speed option is available for Hayes V 25 bis Dumb Leased Line modes except V 33 It controls the DTE speed however it is effective only when the modem is operating in V 42 mode MNP mode or buffer mode The DTE speed can be set for 115 200 57 600 38 400 19 200 9600 4800 2400 1200 600 300 or 110 bps The default DTE speed is 38 400 bps D TE speed refers to the speed of data transfer between the DTE and the local modem It is not necessarily the same as the data transmission speed between the connected modems If flow control is disabled the DTE speed must be equal to or less than the modem speed and the local and remote DTE speeds must be equal For Hayes mode operation the DTE Speed option sets the default DTE speed that will be effective after powerup or after a full modem reset However the default DTE speed is automatically overridden when the Modem is autobauded when an AT attention code is sent to the Modem The Flow Control options control the data flow according to the availability of memory space in the V 42 buffer Flow control can be set independently for the modem to the terminal and for the terminal to the modem The flow control options include DTE DCE DCE DTE and Pass Through Flow Control and Flyback Buffer NOTE Wh
33. is set at either 9600 or 4800 bps depending on the condition of pin 23 on the EIA interface Pin 23 high greater than or equal to 3 volts 9600 bps e Pin 23 low less than or equal to 3 volts 4800 bps Use the Speed Matching option if you don t want speed conversion You can set the DTE interface rate to follow the rate at which the modem connected i e DTE DCE NOTE Speed matching is only effective for dial applications and will only function if V 42 error correction and or buffer mode is enabled To select speed matching refer to Appendix C Follow the instructions given there to change the value identified in the MISCELLANEOUS OPTIONS diagram as the DTE DCE speed parameter from 0 the factory setting to 1 The Speed Limit Type screen is only present on the Modem The V 32 master handshake normally used by the Modem is incompatible with the CCITT V 33 and Bell 208 handshakes However the Modem can be configured for either V 33 or Bell 208 compatibility V 33 or Bell 208 speed limits can be set independently of other options via the Speed Limit Type screen However to ensure proper operation it is recommended that you use the V 33 or 208 Quick Setup configuration as explained in Chapter 2 3 0 Modem Setup Options Table 3 1 Effect of Speed Limit Settings on Data Rate MAX RATE DIALER SETTING bps OPTION RESULTANT DATA RATE bps LEASED LINE MODES 14 400 X 12 000 X 9600 X 300 to 4800 EIA CTRL
34. issued D Displays the current front panel LCD screen of the connected modem on the DTE monitor Performs same function as front panel ENT button Exits from screen Performs same functions as corresponding buttons on front panel Selects choice 1 2 or 3 from LCD Performs same function as right arrow on the modem front panel Displays next menu screen lt or Performs same function as left arrow on the modem front panel Displays previous menu screen RESET Resets the Modem without changing option settings Same as selecting RESET from the MAIN MENU FRESET Resets the Modem to factory defaults Reconfigures modem to Hayes mode default settings 4 0 General Operation and Special Features A carriage return CR is required at the end of a command line except when the command line consists of only one single character command Commands can be entered in upper or lower case Other diagnostic port commands are available for factory use only Therefore some commands that are not listed above may produce a response When an address is specified with the CONNECT or CON command leading zeros are ignored meaning that any of the following forms will work CONNECT 3 22 CONNECT 003 022 CON 000003 22 If a group or unit address is not specified it is assumed to be zero CONNECT 3 same as CONNECT 0 3 Note that a comma is required even if no group or unit number is used
35. length bits 0 9 1210 2 11 Data format 0 Async 1 Sync 2 Line type 0 2 wire dial 1 2 wire leased 2 4 wire leased NOTE Speed limit min and Speed limit max 7200 bps parameters are available only if V 32 bis mode is enabled Modem 34336 Primary Options addr 999 999 Group Unit address address Dial Line Options dial 11111002210 Move the Move the cursor one cursor one Exit to the position to position to AT Profiles the left the right Screen TRANSMITTER RECEIVER Move the Increase Move the cursor to the value of cursor to the previous the blinking the next section of character section of commands by one commands Figure C 2 How to move the cursor in the SETUPS screen using the pushbuttons Pulse dialing rate pulses per sec 0 10 1220 Wait for carrier sec 0 30 1245 2 60 3 75 T1 timer sec 020 120 3 220 8 321 6 423 0 Carrier detect level dial dBm 0 26 1 33 22 43 TX level dial O permissive 1 programmable Disconnect RTS sec O off 1 140 2 120 7 20 Disconnect line current O disable 1 enable Disconnect carrier O disable 1 enable Disconnect TX space O disable 1 enable Disconnect RX space O disable 1 enable Auto answer O disable 1 enable EIA INTERFACE OPTIONS eia 010211000 L Test mode O normal 1 true Remote digital loopback test O disable 1 enable A
36. less than the carrier detect threshold lt CD is displayed Echo Characteristics Screen Displays the characteristics of the echo portion of the receive signal Specifically it shows milliseconds of delay and the offset frequency in Hertz Channel Frequency Offset Displays the frequency offset of the receive signal in Hertz Throughput Screen Functions only if error correction is enabled It shows the rate in bits per second at which the Modem is accepting charatcters from the DTE Packet Screen The packet screen functions only when error correction is enabled It has three components as explained below Size Shows size of data packets MNP or blocks V 42 V 42 bis currently being transmitted MNP uses shorter packets to transmit through noisy lines and longer packets allowing greater throughput when line conditions are good The maximum MNP packet size is 64 MNP classes 1 3 or 256 characters MNP classes 4 and 5 The block size for V 42 V 42 bis is fixed at 128 characters Transmitted TX Number of packets or blocks transmitted since the connection was established Errors ER Number of retransmissions retransmitted because of data errors since the connection was established Mode and Rate Screen Shows the following data Mode Below MODE the screen indicates the error correction status NORMAL Error correction and buffer mode are both inactive V42 V 42 error correction LAPM is active V42bis
37. mode and the other to answer mode To make this selection use the ANS ORG DEFAULT screen on the front panel LCD 3 Configure the modems for leased line auto recovery Modem 34336 2 4 8 29 FAST MASTER AND SLAVE MODES QUICK SETUPS 14 AND 15 In multidrop operation the master modem transmits to all of the slave remote modems When the DTE at a slave site recognizes its own address in the polling protocol it raises RTS to the slave transmitter The slave responds by transmitting a special training sequence then raising CTS and transmitting the data from the DTE When the DTE has completed transmission it lowers RTS and the modem will drop carrier to let the next modem on the poll list use the channel The V 29 Fast Master and Fast Slave modes support data rates of 4800 7200 and 9600 bps The leased lines can be conditioned or unconditioned The master modem must be set to originate mode and the slave modem must be set to answer the mode The Answer Originate option is automatically set to these settings when the V 29 Fast Master and Fast Slave Quick Setups are used Slave to Master Inbound Transmission When the remote modems come on line they automatically synchronize to the incoming carrier and train on the data stream from the master modem Slave to master transmission is always switched carrier operation under control of the RTS signal from the DTE An anti streaming timer built into the modem will if enabled halt
38. modem When the local modem successfully establishes a connection with the remote unit the EIA status screen is present This screen looks like the one shown below TR MR RS CS TD 9600 CD RD Three options are intended for V 33 and Bell 208A B operation exclusively These options are listed in Section 3 3 8 2 4 6 2 WiRE DIAL BELL 208 OPERATION QUICK SETUPS 11 AND 12 The Bell 208 Quick Setup available on the Modem only configures the modem for 2 wire dial synchronous operation compatible with Bell standard 208B The data rate is fixed at 4800 bps and the data format is set to synchronous Both connected modems must be set for 208B operation For additional information on Bell 208 operation see Chapter 4 Beginning with the section titled Answering a Call Automatically all information in Section 2 4 3 also applies to Bell 208 operation Three options are intended for Bell 208 and V 33 operation exclusively These options are listed in Section 3 3 8 2 0 Quick Start 2 4 7 4 WIRE LEASED LINE V 29 MODE Quick SETUP 13 The 4 Wire Leased Line V 29 Mode configures the modem for V 29 operation for compatibility with V 29 modems Keep these guidelines in mind when using this mode The modem must be configured for use with a 4 wire line Operation is restricted to data rates of 4800 7200 and 9600 bps Lines can be conditioned or unconditioned After you select this Quick Setup mode the modem will send
39. nEGISTER RANGE UNITS DEFAULT DESCRIPTION ome mg 1 0255 rings 0 Counts number of rings Ring to answer on Cariage return character Line feed character Escape code character 0 127 ASCII Backspace character 2 255 2 Wait time before blind dialing Wait time for carrier or 1 60 sec dial tone S9 1 255 1 10 sec Carrier detect response time 10 1 255 1 10 sec 14 Delay time between loss of carrier and hang up 0 255 1 50 sec Escape code guard time 25 0 255 sec or Delay to DTR 1 100 sec 5 S26 0 255 1 100 sec 0 RTS to CTS delay half duplex Depends on mode see previous section S25 DELAY TO DTR 6 0 V 25 bis Autodialer For international compatibility the Modem can function as a V 25 bis autodialer In V 25 bis mode the Modem is compliant with CCITT recommendation V 25 bis an internationally recognized standard for serial automatic call origination and answering The V 25 bis autodialer uses the dialing command set defined by the V 25 bis recommendation You can store and dial phone numbers from the DTE in both synchronous and asynchronous applications You can dial numbers directly or you can instruct the Modem to automatically dial a previously stored number 6 1 Enabling The V 25 bis Autodialer The V 25 bis autodialer can be enabled by either using the Quick Setup feature or selecting one of the Dialer Mode options QUICK SETUP Three Quick Setup configurations are available f
40. operation Table 4 5 V 22 bis BELL 212A BELL 103 FALLBACK DEFAULT MODE DESCRIPTION V 22 bis 2400 bps asynchronous synchronous Bell 212A 1200 bps asynchronous synchronous Bell 103 0 300 bps asynchronous All modes are full duplex If V 22 bis V 22 V 21 V 23 fallback operation is enabled the following fallback modes are available As in the previous list the modes are listed in the order in which they are attempted by the Modem Modem 34336 Table 4 6 V 22 bis V 22 V 21 V 23 FALLBACK MODE DESCRIPTION V 22 bis 2400 bps asynchronous synchronous V 22 1200 and 600 bps asynchronous synchronous v 21 300 bps asynchronous V 23 1200 75 bps asynchronous All modes are full duplex The operating mode is controlled through the SPEED LIMIT screens on the LCD in all modes except Hayes mode See Chapter 3 for details 4 10 2 V 32 SPEED FALLBACK This feature applies only to V 32 mode operation It functions only if enabled and the maximum speed is set via the Speed Limit option to the highest available speed 9600 bps for the Modem 14 400 bps for the Modem When V 32 Speed Fallback is enabled the Modem automatically selects the highest possible data rate depending on the signal quality during handshake The Modem automatically selects either 9600 bps or the fallback rate of 4800 bps The Modem selects either 14 400 bps or the fallback rate of 12 000 bps If the error rate is one err
41. pick up the telephone line without dialing a number DS Dial Stored Number The DS command instructs the Modem to dial a telephone number or dial string previously stored using the amp Z command The syntax is DS m with m specifying the memory location where the dialed number will be stored Up to ten numbers may be stored in memory locations 0 9 S m may be placed anywhere in the dial string for example AT D2345S 2 dials 2345 and the number is stored in memory location 2 Modem 34336 Telephone Switch Hook The command on hook is used to terminate a call On hook corresponds to off line H may also alternate between voice and data transmission during the same call if your communication software supports this capability The H1 command off hook activates the telephone line relay causing a dial tone to be sent after a 2 second delay For most purposes the command is not necessary since the switch hook is automatically activated when the Modem originates or answers a call L Link The L dial modifier is used to link one phone number to another One number can be an alternate number to be dialed if a connection is not made to the primary number The L parameter must be used after a phone number and before a carriage return or period A number is used after L to specify the memory address 0 9 containing the number to be linked to the first number See the command below AT D 555 1212 L5 NOTE L may
42. prevents the Modem from receiving an echo of its own transmitted data When the Turnaround Delay option is on CD pin 8 is held low for 150 ms after RTS is turned off If the modem detects an energy loss during the delay it turns CD on 52 ms after detecting the loss If the modem does not detect an energy loss it turns CD on 52 ms after the end of the delay The modem ignores any energy loss during the first 8 5 ms The Analog Loopback Make Busy is available for all modes If the Analog Loopback Make Busy option is enabled the Modem provides a busy indication to the dial line interface when the Modem is in analog loopback test mode The Selective Retransmission option is for Hayes V 25 bis Dumb and Leased Line modes except V 33 This option allows the Modem to communicate with certain modems that are not able to respond to the MNP selective retransmission command Enable This setting allows the modem to request retransmission of a single information frame in the event of a transmission error Disable Data can only be retransmitted in a series of information frames The DCE Pass Through Flow Control option is for Hayes V 25 bis Dumb and Leased Line modes except V 33 This option affects DCE DTE flow control only It is only effective if error correction or buffer mode speed conversion is enabled Enable The Modem will pass flow control characters received from the remote modem to the local DTE D
43. screen To select DTR dialing for V 25 bis mode you must use the Summary Setup feature as explained in Chapter 6 The Auto Answer option is available for Hayes V 25 bis and Dumb modes It determines whether or not a call is automatically answered when the phone rings Setting the Auto Answer option to ENABLE resets Hayes mode register S0 to 1 meaning that calls are answered on the first ring 3 3 3 DATA FORMAT OPTIONS The Data Format Sync or Async option is available for V 25 bis Dumb and Leased Line modes The data format setting for the local modem and for the remote modem must be the same ASYNCHRONOUS Data is transmitted and received in the character asynchronous format The character length next option must be the same for both communicating modems SYNCHRONOUS If this option is selected data must be transmitted and received in the synchronous format The appropriate transmitter clocking option must be selected The synchronous data format is not available for data rates of 300 19 200 or 38 400 bps Modem 34336 The Character Length option is available for all modes asynchronous operation only It selects a character length of 8 9 10 or 11 bits for character asynchronous operation The same character length must be selected for both the local and the remote modems Use pushbuttons l and 3 to select the desired character length 8 BITS start bit 6 data bits and 1 or more stop bits e 9 BITS
44. the modem s front panel CRN Call Request Number Provided Syntax CRN 5557979 By using the CRN command you can dial a number directly from the DTE keyboard Numbers from 0 through 9 can be dialed and if tone dialing is enabled the characters A B C D and can also be dialed The dialing parameters listed in Table 6 2 are used with the CRN command to specify how or when a number should be dialed For example the command line CRN T3331234 instructs the autodialer to wait for a dial tone and then tone dial T the number 333 1234 CRS Call Request Address Provided Syntax CRS 2 The CRS command allows you to dial a number simply by specifying its memory address In the example given above the autodialer dials the number stored in memory address 2 Store the number at the specified address using the PRN command Table 6 1 6 0 V 25 bis Autodialer DIC Disregard Incoming Call The DIC command instructs the autodialer not to answer an incoming call The DIC command is cancelled when the CIC command is issued or auto answer is enabled from the front panel PRN Program Normal Store Number Syntax PRN lt I gt 1 lt 1 gt 5551212 The PRN command is used to store a number or dial string in a memory address location cell so it can be dialed later by specifying only the address As shown above PRN is followed by the memory location a semicolon and the phone number to be stored After a num
45. transmission if the DTE holds RTS on for more than 30 seconds The assumption is that if RTS is held on for more than 30 seconds there is a fault in the DTE If you access the TIA EIA status screen on the LCD display when a slave modem is transmitting to the master modem the status screen will typically look like this TR MR RS CS TD 9600 CD RD Typically TD CD and RD will flash on the master modem and RS CS TD and RD will flash on the slave modems 2 0 Quick Start 2 5 Problem Solving If you encounter difficulties in setting up or using the modem try the remedies described below If you suspect a system malfunction follow the diagnostic procedures described in Chapter 7 If you cannot resolve the problem call your supplier 1 ALL MODES Make sure all cables are properly connected to the back of the modem 2 ALL DIAL MODES Hayes V 25 BIS DUMB BELL 208 AND V 32 208 DTR Data Terminal Ready must be ON if you want to use the modem s autodial or auto answer features If DTR is ON the TR indicator is present on the status screen 3 ALL ASYNCHRONOUS MODES The modem s default DTE speed is 38 4 Kbps in asynchronous mode If the local DTE does not support this speed change the modem s DTE Speed option setting In Hayes mode the default DTE speed is automatically overridden when the Modem is autobauded the Hayes mode AT attention code is sent to the Modem 4 Hayes MODE In Hayes mode with def
46. 32bis QAM at 14 4 12 0 9 6 7 2 and 4 8 V 32 Kbps echo cancel full duplex over 2 wire line Trellis coded at 7 2 Kbps and higher or non coded at 9 6 Kbps 1 0 Specifications V 29 QAM at 9600 7200 and 4800 bps V 27 8 phase DPSK at 4800 and 2400 bps V 26 4 phase DPSK at 2400 and 1200 bps V 23 FSK at 1200 75 bps full duplex V 22 bis QAM at 2400 bps bandsplit full duplex V 22 DPSK at 1200 bps bandsplit full duplex 21 PSK at 0 to 300 bps bandsplit full duplex Autodialer Automatic dialing using rotary pulses or tone signaling supports Hayes AT commands or V 25 bis commands Answer Modes Automatic and manual answer Equalization Receiver Automatic adaptive equalization Transmitter Selectable compromise equalization 4 types Line Requirement Unconditioned Transmit Timing Internal external or slaved to receive clock Transmit Level Leased Selectable 0 to 15 dBm Dial Permissive or programmable Interface Terminal RS 232C D CCITT V 24 V 28 Dialup Line 8 pin RJ 45 modular connector with A Al and MI MIC control Leased Line 6 pin RJ 11 modular connector Diagnostic 8 pin RJ 45 modular connector Carrier Detect Threshold Leased line 96 33 or 43 dBm selectable Dial line 34 41 or 51 dBm selectable Test Capabilities Analog loopback analog loopback self test self test with errors digital loopback remote digital loo pback self test external analog
47. 4 etc may also be displayed in the data speed position see following text TM Test mode ER Error poor signal quality CD Carrier Detect RD Receive Data When two modenns establish a connection they engage in an exchange known as a handshake While a handshake is taking place the Modem displays several codes ranging from H 01 to H 28 in the lower left corner of the EIA status screen A handshake lasts for up to 12 seconds and is accompanied by various audible tones By pressing pushbutton 1 while the EIA status screen is displayed you can access two checksum screens one for the Modem s main circuit board and one for the data pump The checksums provide data intended for use by servicing personnel The checksum screens also show the software revision levels which are also shown on the power on screen 7 6 2 OTHER STATUS SCREENS Quality Screen Displays the quality of the received signal carrier as a numeric value and as a horizontal bar graph A low numeric value indicates good signal quality The best possible signal quality is indicated when the bar graph extends all the way to the right edge of the LCD Line Levels Screen Shows the preset level of the transmit signal TX and the measured level of the receive signal RX 7 0 Diagnostics The RX value is the local receive level of the incoming signal The receive level range of measurement is from 0 to 43 dBm in 1 5 dBm increments If the signal level is
48. 44 393 7 Modem Setups i ania atento su bei 46 3 3 8 33 and BELL 208A B Options 49 3 3 9 Options Accessible With Summary Setup Only 50 4 0 General Operation and Special 54 Al Oek D EE 54 4 2 Phone Number Storage on rere te tenere eren ens 54 43 Leased line Auto Recovery eee mem eee 55 43 1 Avitodial Backup iere entretenir terree D 4 8 2 Exit From Leased Line Auto Recovery eee 57 4 3 3 Leased Line Auto Recovery Options 58 4 4 Dial Line Auto Recovery cccocccoconocnononanonananananannnnarinconncnanannnnannos 58 44 Setting Up The Modem For Dial Line Auto Recovery 58 4 4 2 Recovery Procedure 45 DIR Dalias 4 5 1 Dialing A Stored Number eee 60 4 5 2 Answer Mode Operation sse 60 4 6 Dumb Mode And Bell 208 Operation eese 60 4 7 Modem Security Operation sese 4 8 Modem Controlled Remote Control esse 4 8 1 Direct Modem to Modem Remote Control 4 8 2 Remote Control through a Rack Controller 4 9 Diagnostic Interface Control x teer eet 4 91 Diagnostic Port erento netten 4 9 2 Diagnostic Port Commands 4 9 3 Responses To Diagnostic Port Commands 78 494 DIE Displays ane rris bp ie pae 75 4 9 5 Disconnecting
49. 45 modular connector on one end modem and a DB25 connector on the other terminal end The pin assignments of this connector are shown below Pin Function 1 Constellation X output 2 Constellation Y output 3 Not used 4 Ground 5 Receive data output from modem 6 Transmit data input to modem 7 Not used 8 Not used 4 9 2 DIAGNOSTIC PORT COMMANDS The diagnostic software built into the Modem supports the diagnostic port commands listed in Table 4 3 These commands are issued from a computer or other DTE which must be connected to the modem s diagnostic port To communicate with a modem via the diagnostic port the DTE must be configured for 8 bit character length no parity 1 stop bit and a data rate of 9600 bps Modem 34336 COMMAND Table 4 3 Diagnostic Port Commands FUNCTION CONNECT g u Connect to diagnostic port of modem at group address g unit address u An address must be specified unless the wildcard character is used CONNECT meaning Connect to local modem address unknown unspecified When the connection is made the DTE displays the modem s address Echo line feed and Auto Display are enabled CON performs same functions as CONNECT command except that echo line feed and Auto Display are disabled The wild card character may be used CON NOTE The remaining commands listed in this table will function only if CONNECT or CON with address or has been previously
50. 9600 or 4800 DIAL MODES ANSWERING 300 to 14 400 Xx Negotiated between minimum and maximum setting EIA CTRL 9600 or 4800 DIAL MODES ORIGINATING 300 to 14 400 Negotiated between minimum and ESTEVE setting EIA CTRL 9600 or 48008 HAYES Negotiated between autobaud speed and 300 bps Does not matter condition does not affect resultant data rate 12 000 bps rates are for the Modem only 9600 bps if EIA pin 23 is high 4800 bps if pin 23 is low If SYNC AFTER DIAL is enabled using the amp Q1 command the rate is negotiated between the autobaud speed and 1200 bps Modem 34336 e V 32 The Modem normally uses the V 32 handshake The Modem also uses this handshake for V 32 14 400 bps operation e V 33 V 33 operation is available on the Modem for 4 wire leased line synchronous operation only The available data rates are 14 400 and 12 000 bps Either of these rates may be set as the maximum or minimum by using the Speed Limit MAXIMUM RATE and MINIMUM RATE screens Both connected modems must be set for V 33 leased line operation e V 34 V 34 extended 33 6 kps mode of operation is in compliance with proposed TR 30 1 implementation of two new data rates 31 2kps and 33 6kps which are compatible with V 34 recommendation Interoperability with modems is ensured provided they comply with the TR30 1 proposal 208 This selection on the Modem only provides both Bell 208A compatibility for 2 wir
51. ALOG LOOPBACK TEST The external analog loopback test is available forB The ALBX test allows you to test the local modem and its associated terminal and to verify the availability of the leased line circuit The test circuit does not include the remote modem Figure 7 3 shows the connections automatically made during the ALBX test 829 Block N External loopback leased line Transmitter Data terminal equipment DTE at local site Local modem Figure 7 3 External Analog Loopback Test ALBX Modem 34336 NOTE The ALBX test may result in errors or may fail altogether even where conditions are satisfactory for normal operation The test channel presented to the modem during the ALBX test includes all impairments of both the inbound and outbound channels ampli tude distortion delay distor tion noise etc The main purpose of the ALBX test is to verify that the Modem is connected to the leased line and the leased line circuit is complete The test is not meant to assess the suitability of the leased line Initiate the ALBX test using the Modem s front panel controls as explained in the following paragraphs Make sure the local modem is not in communication with the remote modem the data rate is the same as the DTE s data rate and the circuit is on If TR is present on the EIA status screen the DTR circuit is on From the second page of the LCD MAIN MENU select TEST Go to t
52. An alternative to using the V 25bis CRS command to dial a stored number is to use the DTR dialing option With DTR dialing enabled the autodialer will dial the number stored in the phone cell displayed in the front panel AUTO DIAL screen when DTR goes high for at least 50 ms To enable V 25 bis DTR dialing sue the Summary Setup feature see Appendix C to change the parameter for V25 bis DTR dialing to 1 Do not select DTR dialing via the front panel DIALER screen this will not enable DTR dialing for V 25 bis mode V 25 bis DTR dialing will function only if the V25bis DTR dialing parameter is enabled set to 1 and the V 25 bis autodialer is enabled 6 2 V 25 bis Autodialer Commands In asynchronous applications V 25 bis commands are issued directly from the DTE keyboard or through communications software In synchronous applications the V 25 bis commands are used to facilitate computer controlled communications Punctuation and spaces may be used with V 25 bis commands for clarity but they are not required If used they are ignored by the modem One exception is the colon which instructs the autodialer to wait for a dial tone The V 25 bis commands are described below and are summarized in Table 6 1 See Table 6 3 for explanation of the codes displayed in response to commands CIC Connect Incoming Call The CIC command instructs the autodialer to answer incoming calls The effect is the same as enabling auto answer on
53. E When the Modem is in Dumb mode you can use it for dial line answer only applications dial a previously stored telephone number from the front panel or dial telephone numbers via an external source telephone 2 WIRE LEASED LINE ORIGINATE MODE In Leased Line mode the Modem connects to the leased line and stands ready to send and receive data Use Quick Setup 6 if the leased line is a 2 wire line and you want to configure the Modem as the originate modem 2 0 Quick Start Table 2 1 continued Available Quick Setup Configurations QUICK SETUP lt 07 gt 2 W LEASED ANS QUICK SETUP lt 08 gt 4 W LEASED ORG QUICK SETUP lt 09 gt 4 W LEASED ANS QUICK SETUP lt 10 gt 4 WLL V 33 QUICK SETUP lt 11 gt 2 W DIAL 208 QUICK SETUP lt 12 gt 2 W DIAL V32 208 QUICK SETUP lt 13 gt 4 WLL V 29 QUICK SETUP lt 14 gt V 29 FAST MASTER QUICK SETUP lt 15 gt V 29 FAST SLAVE 2 WIRE LEASED LINE ANSWER MODE Same as Quick Setup 6 except for modem answer originate status Use Quick Setup 7 if the leased line is a 2 wire line and you want to configure the Modem as the answer modem 4 WIRE LEASED LINE ORIGINATE MODE Same as Quick Setup 6 except for line type Use Quick Setup 8 if the leased line is a 4 wire line and you want to configure the Modem as the originate modem 4 WIRE LEASED LINE ANSWER MODE Same as Quick Setup 6
54. ING THE HAYES MODE AUTODIALER You can enable the Hayes mode autodialer either by using the Quick Setup feature or by selecting HAYES from the DIALER screen e Quick Setup If you use the Quick Setup feature to select 2 Wire Dial Hayes the Hayes mode autodialer is enabled and all modem options are automatically set to a preset configuration suitable for typical Hayes mode applications To select the 2 Wire Dial Hayes Quick Setup access QUICK SETUP screen 1 on the LCD and press pushbutton 2 Dialer Mode If you enable the Hayes mode autodialer using the Dialer Mode option no other options are changed Select DIALER from SETUP screen 2 Then select HAYES from the DIALER screen 5 1 2 COMMAND GUIDELINES The following guidelines for using Hayes compatible AT commands also provide a summary of the fundamentals of Hayes mode autodialer operation Note that although carriage returns are not shown in the examples in this chapter a carriage return is required at the end of each command line e Escape Sequence The escape sequence causes the modem to escape from the data transfer mode so it can interpret commands Alternate characters for the escape sequence can be assigned via S register S2 Attention Code AT the attention code must begin all command lines Modem 34336 Command Sequence For dialing a command line begins with AT followed by a D and the phone number Other commands should be placed before the dial co
55. L screen still displayed select DATA to put the Modem in data mode The first person to go to data mode hears his telephone disconnect as his modem connects The other person must wait until he hears an answer tone and then switch to data mode select DATA When both modems are in data mode the data communication begins The LCD displays the status of the connection There are several ways a data call can be terminated You can terminate a call through communication software by following the software manufacturer s instructions An alternate method is to switch to the TALK option talk mode on the MANUAL DIAL screen as described in the previous section Or you can drop the DTR signal from the DTE by software control or by turning the DTE off Modem 34336 4 7 Modem Security Operation In 2 Wire Dial Hayes emulation mode only the Modem can be configured to provide security on incoming calls Remote users attempting to connect to the Modem are required to enter a password Incoming calls are accepted only if the user enters a valid password NOTE The security features described in this manual provide a deterrent to unauthorized access No communications system can be made perfectly secure PASSWORD PROTECTION NOTE Password protection functions only if the Modem is in Hayes emulation mode error correction and or buffer mode are enabled and the data format is asynchronous In Hayes mode only the Modem can be configu
56. Modem to originate mode If you want to set your Modem to answer mode use the front panel controls to access the ANS ORG DEFAULT screen MODEM SETUPS screen 4 Then select ANSWER answer mode To manually originate a data call select TALK from MAIN MENU screen 1 The MANUAL DIAL screen is displayed Select TALK again This puts the Modem in talk mode Lift the handset and listen for the dial tone Dial the phone number of the remote modem When you hear a high pitched answer tone select DATA from the MANUAL DIAL screen and 4 0 General Operation and Special Features place the handset back on the cradle The LCD displays the status of the communication It appears as shown below D TR MR RS CS 9600 The data link between the two modems is now established and data transfer begins An incoming call may be answered manually or automatically To answer a data call manually you must disable the Auto Answer option Before the call is received the Modem must be set to TALK as explained in the previous section The first unit that is switched to DATA mode must be set for answer mode using the answer originate option The other unit must be set for originate mode NOTE If you set the Modem to talk mode the phone rings but the Modem will not answer even if the Auto Answer option is enabled After you answer the phone and initiate a conversation with the caller the Modem must be set for data mode With the MANUAL DIA
57. Resets modem and recalls stored user profile 0 Z1 Resets modem and recalls stored user profile 1 comma Pause No parameters but default pause time in register S8 is two seconds semicolon Forced Command State No parameters Wait For Silence Before Dialing No parameters but default wait time register S7 is 30 seconds exclamation Initiate Flash No parameters Data Carrier Detect Control amp CO DCD always ON when DTR is present amp C1 DCD ON only in the presence of suitable data amp C2 DCD ON when DTR is present then toggles off for 50 ms upon disconnect amp D Data Terminal Ready Control Ignore DTR Go on hook assume command state and disable auto answer upon DTR ON to OFF Reinitialize in the event of DTR ON to OFF amp D3 amp F Recall Factory Configuration No parameters amp G Guard Tone Control Guard tone disabled Enables 550 Hz guard tone Enables 1800 Hz guard tone Modem 34336 Table 5 1 continued Hayes Compatible Commands COMMAND FUNCTION EXPLANATION Modem displays OK result code command has no other effect The Modem is configured for A A1 control or MI MIC control via jumpers JP2 and JP3 as detailed in Appendix D amp L Modem displays OK result code command has no other effect The Modem is configured for leased line or dialup line operation via the front panel QUICK SETUP and or LINE TYPE screens Can be substituted for amp Q
58. S access the configuration change the Hayes mode user profiles profile O and profile 1 Figure C 1 How to access the Summary Setup Screens Appendix C Summary Setup C 2 SETUPS Screen Only part of the SETUPS screen can be 5 displayed at any one time The full screen L1214E0 999 99 is displayed below next to the numbers 1 2 and 3 To make configuration and viewing easier the screen is broken down into a number of sections Use the front panel pushbuttons to move around within the SETUPS screen see Figure C2 addr dial eia v42 lt 1 gt 999 999 11111002210 000100000 20334300 v42 lt 2 gt Lis Lo pump1 pump2 pump 3 210001021 10000010 30100101100 00000110 00000000 miscl misc2 misc3 1141110 0000 OO0O1FFFF1 71000000 Primary Options PRI 00 214E0 Speed limit type 02 V 32 V 32bis 1 V 33 2 Bell 208 Speed limit min bps 4219 2 5216 8 K 6 14 4 7212 0 K 8 9600 9 7200 A 4800 B 2400 C 1200 D 600 E 0 300 F 1200 75 Speed limit max bps 4 19 2 K 5 16 8 K 6 14 4 K 7 12 0 K 8 9600 9 7200 A 4800 B 2400 C 1200 D 600 E 0 300 F 1200 75 G EIA 23 3 h Buffer mode speed conversion O disable 1 enable V 42 mode Ozoff 12mandatory 2 automatic 3 Dialer mode 0 off 1 Hayes 2 DTR dialing 3 V 25 bis async 4 V 25bis sync character oriented 5 V 25 bis sync bit oriented 3 Character
59. V 22 V 21 V 23 fallback operation refer to Appendix C Follow the instructions given there to change the value identified in the MISCELLANEOUS OPTIONS diagram Appendix C as the Operating Mode Fallback parameter from 0 default setting to 1 4 0 General Operation and Special Features Changing the Operating Mode Fallback parameter to 1 has the following effects The Modem is configured for V 22 bis 2400 bps V 22 1200 and 600 bps V 21 300 bps V 23 1200 75 bps fallback operation As a result 600 and 1200 75 bps appear as additional selections on the SPEED LIMIT LCD screens Fallback to V 22 bis Bell 212A and Bell 103 compatibility is disabled An AT command is available in Hayes mode only that allows control over operating mode as follows FO Multi mode operation default F1 V 21 300 bps F2 V 22 600 bps F3 V 23 1200 75 bps FA V 22 1200 bps F5 V 22 bis 2400 bps F6 V 32 highest common speed Except for multi mode operation the mode and speed are limited to the mode and speed specified Multi mode operation allows the modem to automatically fall back to the most efficient mode that can be used by both modems The preferred mode is V 32 9600 or 4800 bps asynchronous synchronous full duplex however if the other modem does not support the V 32 standard the Modem falls back to one of the modes listed below The fallback modes are listed in the order in which they are attempted by the Modem in normal
60. a que la tierra fisica y la polarizaci n del equipo no sea eliminada Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados sobre o contra ellos poniendo particular atenci n a los contactos y recept culos donde salen del aparato El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante En caso de existir una antena externa deber ser localizada lejos de las lineas de energia El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilaci n Servicio por personal calificado deber ser provisto cuando A El cable de poder o el contacto ha sido da ado u B Objectos han ca do o l quido ha sido derramado dentro del aparato o C El aparato ha sido expuesto a la lluvia o D El aparato parece no operar normalmente o muestra un cambio en su desempe o E El aparato ha sido tirado o su cubierta ha sido da ada BLACK BOX Copyright 1999 Black Box Corporation All rights reserved 1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746
61. ack Buffer Buffer Mode Speed Conversion e Pass Through Flow Control All of the above options affect the type of error correction selected via the V42 SELECTION screen discussed below except that the MNP Class and Flyback Buffer options are applicable only to MNP operation The error correction options can be selected in any order but the following sequence is suggested 1 Select the type of error correction desired from the V42 SELECTION screen 2 Make a selection from the V 42 Mode screen 3 Select other error correction options as appropriate for your application The V 42 Mode is available for Hayes V 25 bis Dumb and Leased Line modes except V 33 The V 42 Mode settings described below apply to the type of error correction selected with the V42 Selection screen For example if LAPM ONLY is selected as the error correction protocol and MANDATORY is selected from the V42 Mode screen V 42 or V 42 bis error correction is activated If the error correction cannot be activated the Modem will hang up OFF Error correction will be disabled MANDATORY Error correction will be activated If the modem cannot establish a connection using the type of error correction selected via the V 42 Selection option it will hang up AUTO The Modem will fall back to buffer or non buffer mode if conditions do not allow it to establish a connection using the type of error correction selected via the V42 SELECTION screen
62. al Operation and Special Features Answering a Call Automatically After the Quick Setup for 2 Wire Dial Dumb mode is selected the Modem will automatically answer incoming calls The only other requirement is that either 1 the DTE must provide the DTR signal TR on the LCD status screen to the modem or 2 DTR must be set to TRUE using the modem s DTR from EIA option screen Originating a Call from the Front Panel Before you can originate a call from the front panel you must store the number to be dialed in the modem From the Set up lt 5 gt screen access the PHONE screen by pressing the following pushbuttons in sequence Pushbutton 1 Phone Pushbutton 2 Prog The abbreviations DEC CTRL and INC are displayed on the bottom line of the LCD indicating that you located the PHONE screen Follow the steps below to store the phone number Use the right and left arrow pushbuttons to go to the digit you want to change The cursor causes the character at that digit location to blink indicating that the digit or character can be changed 2 Use pushbutton 1 to decrease numbers and pushbutton 3 to increase them 3 Use pushbutton 2 CTRL to sequence through the dialing control characters explained in Chapter 3 4 Use the arrow pushbuttons to move on to the next digit or character you want to change The characters that can be stored are listed in Chapter 3 5 The phone number is saved when you return t
63. also be used in V 25 bis mode with the CRN command instead of AT D in both Dumb mode and 208 operation In Dumb mode or 208 operation L is stored via the PHONE screen In all cases L is used in the same way and has the same function as described above except that AT D is not used Two or more addresses may be linked in a cyclic fashion to alternate dialing until a connection is established Contents of cell 0 555 1212 L1 Contents of cell 1 444 1234 L2 Contents of cell 2 888 5555 LO With the cells loaded as shown above if the command AT DS 0 is issued the autodialer goes to cell 0 and dials the number stored there If unable to connect the L1 command stored in cell 0 directs the autodialer to dial the number in cell 1 The L2 stored in cell 1 directs the autodialer to cell 2 assuming a connection cannot be made and the LO command stored in cell 2 directs the autodialer back to cell 0 The numbers are dialed in a loop until a connection is established or until 10 calls are attempted 5 0 Hayes Emulation Mode O Forced On Line For asynchronous operation only When the modem is on line you can return to the command state by entering the escape code After the desired command is executed use the O command to force the modem from the command state to the on line state e P Pulse Dial The P command instructs the modem to pulse dial It can be entered anywhere in the dialing string AT P5551212 or it can be e
64. ault see amp Y command in 5 0 Hayes Emulation Mode To entirely reconfigure the modem to the state it was in when shipped from the factory hold in the right arrow pushbutton as you power up the modem until the words FACTORY DEFAULT appear on the LCD 3 3 Options The rest of this chapter describes the options available from the Modem s front panel The options are presented in the same order in which they appear in the LCD flow chart at the back of this manual The line below each option heading indicates the applicability of the option A Quick Setup mode is listed only if the option is effective in that mode and if it can be of practical use in that mode Modem 34336 The default settings for each option are listed in Appendix B The Quick Setup options one for each operating mode affect the entire modem configuration See Chapter 2 The Line Type options are available for all modes 2 WIRE DIAL for dialup applications 2W LL for leased line applications using 2 wire lines 4W LL for leased line applications using 4 wire lines The Speed Limit option available for all modes allows you to set a minimum and or maximum data rate The Modem automatically operates at the highest possible data rate within the limits selected as indicated in Table 3 1 Only the minimum rate selection applies to Hayes mode operation EIA 23 is available for setting the maximum rate only If EIA 23 is selected the rate
65. ault settings in effect the Modem transmits result codes messages to the DTE In some instances this may cause undesirable interaction with the attached DTE If such interaction occurs use the AT Q2 command to suppress result codes for incoming calls 5 ALL LEASED LINE MODES 2 WIRE 4 WIRE AND V 33 DTR Data Terminal Ready must be ON for the units to train on the leased line If DTR is ON the TR indicator is present on the status screen Four types of compromise equalization are available to compensate for distortion If the signal quality appears to be inadequate see Quality Screen in Section 7 6 2 or if the modems are frequently retraining try changing the equalization option See Compromise Equalizers in Section 3 3 6 6 LEASED LINE EXCLUDING V 33 OPERATION Make sure one modem is set to originate mode and that the other is set to answer mode If the correct Quick Setup is selected and not incorrectly modified the answer originate status should be correct Modem 34336 NOTE This page is intentionally left blank 3 0 Modem Setup Options 3 1 Methods For Selecting Options The Modem allows you to easily select options for tailoring the modem s operation to suit a particular application You can be select options in the following ways Quick Setup the easiest way to set up the Modem Quick Setup explained in Chapter 2 automatically sets all options according to a preset configuration
66. automatically dial the number previously stored using the front panel LCD DTR must remain on for at least 50 ms to effect automatic dialing A 50 ms drop of DTR aborts the process or disconnects the call When DTR goes high again for at least 50 ms the automatic dialing process begins again 4 5 2 ANSWER MODE OPERATION If the Modem is set for DTR dialing it automatically answers without DTR However it will not transfer data until DTR goes high The call may be terminated by dropping DTR 4 6 Dumb Mode And Bell 208 Operation Bell 208 operation is available on the Modem only For additional information see Section 2 4 6 Table 6 2 in Chapter 6 lists dialing parameters that may be used to modify Dumb mode or Bell 208 dialing operations MANUAL ORIGINATE ANSWER OPERATION When the Modem is operating in Dumb mode or configured for Bell 208 operation data calls may be manually originated from a phone set Plug the phone into the Modem jack marked PHONE For manual originate operation the remote modem may be configured for either automatic or manual answer For manual originate answer operation one modem must be set to ANSWER and one must be set to ORIGINATE via the ANS ORG DEFAULT screen For either type of operation use the Dumb mode or Bell 208 Quick Setup to configure the Modem The Dumb mode Quick Setup defaults to asynchronous operation the Bell 208 Quick Setup defaults to synchronous operation Either Quick Setup sets the
67. ber is stored it can be dialed using the CRS command You can store any of the characters listed in Table 6 2 Ten memory cells 0 9 are available for phone number storage Each cell can hold a maximum of 25 characters although cells 1 through 9 automatically expand to the next empty cell if loaded with more than 25 digits Even if a stored number is continued to another cell the maximum number of characters that can be stored is 36 You cannot store a number in a cell unless it is empty To clear a cell enter PRN and the address without a number Only cell 0 can be accessed from the modem s front panel via the PHONE LCD screen RLN Request Stored Number s RLN is used to request a list of all stored numbers or to show the number stored in a specific memory address RLN used alone requests a list of all stored numbers The DTE display shows the stored numbers as follows LSN 0 301 555 1234 LSN 1 301 123 4567 LSN 2 301 555 5555 and so on through memory address 9 Ifa memory address is specified after RLN e g RLN 5 the DTE display shows only the number stored at the specified address Modem 34336 Table 6 1 V 25 bis Autodialer Commands COMMAND FUNCTION Connect incoming call Call request dial number n entered on DTE keyboard Call request dial stored in specified memory address m Disregard incoming call Program normal store number or dial string n in memory address m Switch to
68. cates the operational status of the Modem as well as the condition of certain RS 232 leads The abbreviations that may appear are identified below Typically only a few of these abbreviations will be displayed during actual operation D TR MR RS CS 9600 CD D Dial line occupied R Ringing R appears in same position as D S Connection secured by security handshake S appears in same position as D S and D may flash alternately TR Data Terminal Ready MR Data Set Ready RS Request to Send CS Clear to Send TD Transmit Data 14 4 9600 4800 etc Data speed in Kbps thousand bits per second or bps bits per second idle or H 01 H 14 etc may also be displayed in the data speed position see text below Test mode ER Error poor signal quality CD Carrier Detect RD Receive Data Codes beginning with H such as H 01 in the lower left corner of the status screen indicate that the Modem is handshaking with another modem attempting to establish a connection When the modem is off line the word idle is displayed in the lower left corner of the status screen 2 0 Quick Start 2 3 Quick Setup To set up the Modem for immediate use or to quickly change the modem s configuration for an alternate mode of operation select one of the factory preset Quick Setup configurations see Table 2 1 Your Modem will be ready for operation You will not need to
69. cations difficulties you should try to isolate the defective component in your communications system You must first identify the symptoms and scope of the problem Then perform a physical inspection of all units and connections in the system Finally conduct diagnostic tests Very often the diagnostic testing capabilities of the Modem help identify the specific faulty component whether it is the modem the DTE or the telephone line 7 2 Symptoms and Scope of The Problem To isolate the problem carefully consider each of the following questions When did the problem begin What is malfunctioning Try to isolate the component or components of your system that are malfunctioning Has there been a recent change in the system Has the modem been reconfigured You can quickly find out if the modem is reconfigured by checking the checksum shown in the SUMMARY screen accessed via SETUP screen 6 and comparing it with the checksum displayed when the modem was operating properly If the checksum is different from the original one or more option settings are changed If you previously recorded the number strings 1 option parameters displayed in the setups screens you can determine which option settings are changed by comparing the previous and current option parameters Modem 34336 7 3 Physical Inspection The next step in isolating a defective component is inspecting the system If you can trace the problem to a spec
70. ck Buffer options are available Hayes V 25 bis Dumb Leased line modes except V 33 The Flyback Buffer option is effective only when MNP error correction is active Flyback buffering is used for specific applications such as printers teletypes etc ENABLE If MNP is buffering data a five character delay is inserted after the following characters are sent to the terminal HT 09 LF 0A VT 0B FF 0C and CR 0D DISABLE Flyback buffering will not occur Modem 34336 The Pass Through Flow Control options are available for Hayes V 25 bis Dumb and Leased Line modes except V 33 Pass Through Flow Control affects DTE DCE flow control only This option determines whether flow control characters are passed through the communication channel but only if control characters are used for flow control e ENABLE Flow control characters are passed to the remote end of the communication connection after the modem acts upon them DISABLE Flow control characters are not passed The Address option is available for all modes The address screen allows you to set the address of the modem at your location An address may be useful if the Modem will be used in a rack enclosure or in a network environment The available address numbers are 000 000 through 999 999 On the Address screen the three digits to the right of the comma are the unit address number The three digits to the left are the group address number To
71. count Wait time before blind dialing Wait time for carrier dial tone In addition the amp W command does not save stored phone numbers amp Z Store Telephone Number The amp Z command is used to store a telephone number dialed using the DS dial stored number command The syntax is amp Zm n where m specifies the memory location in which the phone number or dial string is stored and n is the number or dial string to be stored For example AT amp Z5 T 1 301 555 1212 stores the specified number at memory location 5 Ten memory locations are available 0 9 For pulse dialing digits 0 through 9 can be stored For tone dialing 0 through 9 A through D and can be stored The dial command modifiers listed in Section 5 1 2 can also be stored Each memory cell can hold a maximum of 25 digits Cells 1 through 9 automatically expand to the next empty cell if loaded with more than 25 digits Even if a stored number is continued to another cell the maximum number of characters that can be stored is 36 If more than 36 characters are included in a dial string the command is ignored A cell cannot hold a number unless it is empty Only cell 0 can be accessed from the Modem s front panel via the PHONE LCD screen NS View Status Of V 42 Related Configuration The S command displays the active V 42 error correction configuration stored V 42 profiles and certain other data not displayed by the amp V command 5 3 S Regis
72. d returns the Modem to the command state After the OK prompt is displayed on the DTE the command AT D T 09014 is entered The command transmits the identification number 0901 to the bank and again returns the Modem to the command state An account number and other data may be transmitted in the same way The second example illustrates one method of autodialing Enter a dial string that ends with a semicolon for example AT DT9 3331234 During the ring signal or when the call is answered pick up the phone and enter AT You may then use a telephone connected to the Modem for voice communication Wait For Silence Before Dialing The command is used to gain access to a system without a dial tone It tells the modem to wait for 30 seconds or the time specified by register S7 for one or more rings followed by 5 seconds of silence before processing the next symbol in the dial string 5 0 Hayes Emulation Mode e Initiate Flash The command causes the Modem to go on hook for 1 2 second The command has the same effect as holding the switch hook button on your telephone down for 1 2 second Some PBX systems use a flash to transfer calls e amp F Recall Factory Configuration The amp F command restores the Modem to its original factory configuration using data stored in ROM However the change is not permanent If the Modem is turned off or reset the recalled configuration is replaced with the default stored profile See
73. d value to be written S Read S Register Parameter is the register number T Tone Dialing No parameters V Word Digit Result Code VO Result codes are transmitted as digits V1 Result codes are transmitted as words W Wait For Dial Tone No parameters but default wait time register S7 is 30 seconds X Select Result Code Selects basic result codes 0 4 No speed indication no busy or dial tone detect Selects result codes 0 5 10 11 13 14 15 and 18 Connection speed up to 14 400 bps indicated no busy or dial tone detect Selects result codes 0 6 10 11 13 14 15 and 18 Same as X1 except dial tone detect is enabled Selects result codes 0 5 7 10 11 13 14 15 and 18 Same as X1 except busy signal detect is enabled Selects all result codes Connection speed up to 14 400 bps indicated busy signal and dial tone detect enabled Note Result code 8 is independent of the X command it is displayed only when the Q dial modifier is used Default settings where applicable are in bold face f user profile 1 is active options are controlled for Hayes mode operation by given commands or Summary Setup Do not change via front panel except via Summary Setup 5 0 Hayes Emulation Mode Table 5 1 continued Hayes Compatible Commands COMMAND FUNCTION EXPLANATION Long Space Disconnect Disables long space disconnect Enables long space disconnect Yo Y1 2 Recall Stored User Profile ZO
74. ddress of the modem to which you want to connect The DTE disconnects from the first modem and immediately connects to the one you specified Modem 34336 If you want to disconnect from the diagnostic link without establishing a new link issue the CONNECT command without an address 4 10 Automatic Fallback The Modem incorporates two automatic fallback features that are controlled by the user Operating Mode Fallback Provides compatibility with modems that use any of several different operating modes V 32 Speed Fallback Allows the Modem to automatically select the highest possible data rate depending on the signal quality during handshake Both of the above fallback features function when the modem is in either manual or automatic originate mode or manual or automatic answer mode 4 10 1 OPERATING MODE FALLBACK This section applies to dial line operation only When the Modem originates or answers a call it determines from the handshake routine with the other modem the most efficient operating mode that is supported by the other modem and automatically falls back to that mode The Modem supports two alternatives for operating mode fallback V 22 bis Bell 212A Bell 103 fallback operation default setting and V 22 bis V 22 V 21 V 23 fallback operation For communication within the United States use the default setting for Operating Mode Fallback V 22 bis Bell 212A Bell 103 To configure the modem for V 22 bis
75. dicating that the command is accepted dials the telephone number 555 1234 and then waits for an answer tone from the remote modem If no carrier is detected within a given time default is 45 seconds the modem automatically releases the line and sends a CFI NT result code to the attached DTE Spaces entered in the command line for clarity are ignored CRN 555 1212 has the same effect as CRN5551212 When a phone number is successfully dialed the EIA status screen on the Modem looks like the one shown below D TR MR RS CS 9600 CD Synchronous V 25 bis Operation The data format of the DTE should be set to 7 data bits with odd parity In synchronous applications the V 25 bis commands can be used to facilitate computer controlled operations Synchronous bit oriented operation uses High Level Data Link Control HDLC formatting Synchronous character oriented operation uses synchronous start of text and end of text characters to frame messages The start of text character is preceded by two synchronous SY characters 2 0 Quick Start 2 4 3 2 WIRE DIL DUMB MODE Quick SETUP 5 Dumb mode is used primarily for manual call origination answer only applications and in conjunction with certain dial back security systems that utilize MI MIC signals to place the modem on line If you need to configure the modem for MI MIC use refer to Appendix D For additional information on Dumb mode operation refer to Chapter 4 0 Gener
76. e Auto Recovery desired DIAL IF BAD gt gt 1 2 3 or 4 min means dial backup occurs if bad line conditions are present for the number of minutes selected To disable Leased Line Auto Recovery select NO AUTO RECOVERY A sixth option Manual Recovery is discussed below Modem 34336 NOTE If DIAL IF BAD gt gt 1 2 3 or 4 min is selected the Select option setting of the answer unit must be equal to or less than the Select option of the originate unit If both modems are set for Manual Recovery the originate unit is used to autodial the number stored via the PHONE screen without having to change the LINE TYPE setting on either unit To autodial access the AUTO DIAL screen and select DIAL To return to the leased line select HANGUP from the AUTO DIAL screen The Return From Leased Line Auto Recovery option determines the criteria for exiting the Leased Line Auto Recovery mode lt D 0 gt RETURN IF GOOD gt gt 10 40 60 or 120 seconds means the modem automatically exits the Leased Line Auto Recovery mode when it tests and finds the leased lt M 2 gt line in good condition for more than the time period specified 10 40 60 or 120 seconds D 960 If the Return option is set to OFF the modem stays in the Auto Recovery mode indefinitely unless you select HANGUP from the AUTO DIAL screen a loss of line current or other normal disconnect occurs Either event returns communication to the leased line NOTE
77. e LCD Intensity option is available for all modes It allows you to use pushbutton 3 for INC or increase to darken characters on the LCD or pushbutton 1 for DEC or decrease to lighten them 3 3 9 OPTIONS ACCESSIBLE WITH SUMMARY SETUP ONLY The twelve options described below can only be changed through the modem s Summary Setup feature which is explained in Appendix C The Wait For Carrier option is available for V 25 bis Dumb modes The time the modem waits for a carrier signal when origin ating a call can be set for 30 45 60 or 75 seconds In Hayes mode the wait for carrier time is determined by the value in register S7 The Phase Reversal in Answer Tone option is available for all modes When enabled the Phase Reversal in Answer Tone option signals the telephone network to turn off its echo cancelers For virtually all applications phase reversal should be enabled the default setting The Satellite Delay option is available for 208 mode It facilitates transmission over satellite links but does not permit fast turnaround operation When the Satellite Delay option is on RTS is inhibited for 275 ms after the answer tone stops and after the DSR signal comes on The delay occurs at both the originating and answering modems allowing the echo suppressors on the telephone link to be enabled 3 0 Modem Setup Options The Turnaround Delay option is available for 208 mode It is intended for circuits where echo is a problem It
78. e RX Receive Space Disconnect option is available for Hayes V 25 bis and Dumb modes If it is enabled a 1 6 second continuous space will cause the modem to disconnect NOTE For Hayes mode operation both the RX Space Disconnect and TX Space Disconnect options must be either enabled or disabled The TX Transmit Space Disconnect option is available for Hayes V 25 bis Dumb modes When TX Space Disconnect is enabled the Modem transmits 4 seconds of space prior to disconnecting from the line This ensures a clean disconnect if RX space disconnect is enabled on the remote modem NOTE For Hayes mode operation both the TX Space Disconnect and RX Space Disconnect options must be either enabled or disabled The Character Disconnect option is available for V 25 bis and Dumb modes Ifit is enabled a 400 ms loss of carrier signal causes the line to be disconnected To set this option for Hayes mode use S register S10 see Section 5 3 The Line Current Disconnect option is available for V 25 bis Dumb modes If enabled a 400 ms loss of current causes the line to be disconnected To set this option for Hayes mode use S register S10 see Section 5 3 The RTS Disconnect option is available for Hayes V 25 bis and Dumb modes When RTS Disconnect is enabled if RTS is off for a selected period of time 20 to 140 seconds user selectable the line is disconnected Use pushbuttons 1 and 3 to set the RTS OFF period required f
79. e operation If profile 1 is being used as the active configuration the options marked with an asterisk in Table 5 1 should be controlled either with the AT commands listed in Table 5 1 or using the Summary Setup feature described in Appendix C When Profile 1 is active these options can be changed via the front panel LCD but the changes are effective only for Hayes mode operation However if Profile 0 is subsequently recalled as the active configuration the changes are effective at that time 5 5 Hayes Mode Reference Tables Table 5 1 lists the Hayes compatible commands used with the Modem Modem 34336 Table 5 1 Hayes Compatible Commands COMMAND FUNCTION EXPLANATION Quick Answer No parameters Repeat Previous Command No parameters Bell CCITT Compatibility Mode Selects CCITT V 22 mode Selects Bell 212A mode Modem displays OK command has no other effect This response instead of ERROR maintains a degree of compatibility with older modems supporting this command Originate Mode For Dialing No parameters Dial Stored Number Parameters are 0 9 available memory locations Echo No echo Echoes all characters back to terminal screen when using a full duplex terminal and in local command mode Modem displays OK Command has no other effect unless V 22 bis V 22 V 21 V 23 fallback operation is enabled Telephone Switch Hook Ho On hook hang up H1 or H2 Off hook Default settings where applicab
80. e or 4 wire leased line operation and Bell 208B compatibility for 2 wire dial operation Operation is full duplex in 4 wire leased line mode only In Bell 208B mode synchronous V 25 bis autodialing is available but Hayes operation is not In Dumb mode calls may be originated from the front panel The data rate is fixed at 4800 bps for 208A B operation and the data format is synchronous only Both connected modems must be set for 208A B operation For 2 wire applications the carrier option must be set for switched carrier operation SWITCH via the CARRIER screen and CTS must be set to follow RTS CTS to EIA option Three options intended only for 208A B and V 33 operation are accessible through MODEM SETUPS screen 7 These options allow you to select constant or switched carrier set CTS to follow RTS or set CTS to be always on or specify an RTS CTS delay time For further information see the CARRIER CTS and RTS CTS DELAY headings later in this chapter 3 0 Modem Setup Options 3 3 1 V 42 ERROR CORRECTION OPTIONS The Modem supports both CCITT V 42 error correction and Microcom Networking Protocol MNP error correction classes 1 through 5 V 42 and MNP provide end to end error correction through an automatic repeat transmission request algorithm Both types of error correction enable the Modem to detect data transmission errors and automatically request retransmission of adversely affected data until it is received correct
81. ee Appendix D Appendix B Quick Setup Configurations Table B 1 shows the complete default configuration for each of the Quick Setup modes When you select a Quick Setup the modem automatically sets all options as indicated in the table The options are listed in the same order in which they appear on the LCD flow chart See 2 0 Quick Start for instructions on selecting Quick Setups NOTE All notes appear at the end of the table Table B 1 Quick Setup Configurations Default Settings Listed by Mode or Type of Operation 4 WIRE OPTION LEASED LEASED Line Type Line Type 2W LL 4W LL Speed Speed Max 19200 19200 Data Rate Speed Min 4800 4800 Speed Type V 32 V 32 V 42 V 42 Mode Auto Auto Error Correction MNP Class Options Limit 5 5 5 5 5 5 5 V 42 Break NDT NDT NDT NDT NDT NDT NDT Handling NEXP NEXP NEXP NEXP NEXP NEXP NEXP V 42 LAPM LAPM LAPM LAPM LAPM LAPM LAPM Protocol MNP MNP MNP MNP MNP MNP MNP V 42 bis Enable Enable Enable Enable Enable Enable Enable Buffer Enable Enable Enable Enable Enable Disable Disable DTE Speed 38400 38400 38400 38400 38400 38400 38400 Flow Control DC1 DC1 DC1 DC1 DC1 DC1 DC1 DTE DCE DC3 DC3 DC3 DC3 DC3 DC3 DC3 Flow Control DC1 DC1 DC1 DC1 DC1 DC1 DC1 DCE DTE DC3 DC3 DC3 DC3 DC3 DC3 DC3 DTE Pass thru Flow Control Disable Disable Disable Disable Disable Disable Disable
82. egister number and the value currently stored in the displayed S register How TO CHANGE S REGISTER VALUES Select the desired S register number then modify its value as follows Use the arrow pushbuttons to move the LCD cursor from one digit to the next Then select DEC or INC to decrease or increase the selected blinking value until the desired value is displayed S registers can also be changed by using the Hayes mode S command as explained in 5 0 Hayes Emulation Mode Stored value S register number or the value to be stored decimal hexadecimal Decrease the value Increase the value of the blinking of the blinking character by one character by one Figure C 3 Changing the S Register Value Modem 34336 Appendix D Jumpers WARNING Jumpers should be switched only by qualified service personel For most applications there is no need to reset the modem s internal jumper switches However a jumper switch will have to be reset if you need to do any of the following Connect frame ground to signal ground e Switch from A AI control to MI MIC control Strap the modem for use in a DC rack enclosure Change the function of EIA interface pin 25 If you need to reset a jumper switch refer to the next page to determine the jumper that should be switched where it is located and how it should be set The jumpers are numbered on the circuit board for example JP4 is jumper 4 To access the j
83. en flow control is disabled the DTE data rate must be equal to or less than the modem data rate and the local and remote DTE data rates must be equal This precludes the need for flow control which some computers and terminals cannot handle and avoids buffer overflow 3 0 Modem Setup Options The DTE DCE Flow Control options are available for Hayes V 25 bis Dumb and Leased Line modes except V 33 NONE No flow control is used RTS ON OFF The Request to Send signal controls data flow from the modem to the terminal e DC1 DC2 Inserts control characters CONTROL R and CONTROL Q in the data stream stop and start the flow of data from a device DC1 DC3 X ON X OFF The most common method of flow control It inserts control characters into the data stream CONTROLS stops the flow of data and a CONTROL Q restarts it NOTE When using the modem for binary file transfer in band flow control flow control using control characters must be disabled In this case use hardware flow control or as an alternative lower the DTE speed to lessen the possibility of overflow The DCE DTE Flow Control options are available for Hayes V 25 bis Dumb and Leased Line modes except V 33 All information given above under DTE DCE Flow Control options also applies to DCE DTE modem to terminal flow control options except that the CTS Clear to Send signal is used to control DTE DCE data flow instead of RTS Flyba
84. etadas 4 Todas las instrucciones de operaci n y uso deben ser seguidas 5 El aparato el ctrico no deber ser usado cerca del agua por ejemplo cerca de la tina de ba o lavabo s tano mojado o cerca de una alberca etc 6 El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all a lo descrito en las instrucciones de operaci n Todo otro servicio deber ser referido a personal de servicio calificado 9 El aparato el ctrico debe ser situado de tal manera que su posici n no interfiera su uso La colocaci n del aparato el ctrico sobre una cama sof alfombra o superficie similar puede bloquea la ventilaci n no se debe colocar en libreros o gabinetes que impidan el flujo de aire por los orificios de ventilaci n Modem 34336 10 11 12 13 14 15 16 17 18 El equipo el ctrico deber ser situado fuera del alcance de fuentes de calor como radiadores registros de calor estufas u otros aparatos incluyendo amplificadores que producen calor El aparato el ctrico deber ser connectado a una fuente de poder s lo del tipo descrito en el instructivo de operaci n o como se indique en el aparato Precauci n debe ser tomada de tal maner
85. features and operational modes listed here in the order in which they are presented Quick reset Dumb mode and Bell 208 operation Phone number storage Security operation Leased Line Auto Recovery Diagnostic interface control Dial Line Auto Recovery Automatic fallback DTR dialing e V 13 operation The status screens which display data concerning the operational status of the modem are discussed in Chapter 7 Instructions for using the pushbutton controls and LCD are included in Chapter 3 4 1 Quick Reset Quick Reset enables you to reset the modem without powering down the unit For a soft reset of the Modem when option settings are not changed but the modem is cleared for a new start and the ROM memory chip is checked select RESET from MAIN MENU screen 3 The modem displays the power on screen for a few seconds Then it displays the status screen 4 2 Phone Number Storage This feature is used to store a number to be used later for autodialing from the front panel DTR dialing or for leased line or dial line auto recovery To store numbers in Hayes mode see Chapter 5 To store a number from the front panel select PHONE from MODEM SETUPS screen 5 The following screen is displayed DEC CTRL INC 4 0 General Operation and Special Features If a number has been previously stored the number is displayed on the top line of the LCD instead of dashes as shown above Only one pho
86. flow control default for DCE DTE and DTE DCE Load Inactivity Timer Disables inactivity timer Sets inactivity timer to n minutes where n 0 to 60 V 42 Result Codes Activates regular V 42 result codes Activates extended V 42 result codes V 42 Pass Through Flow Control Enables pass through flow control Disables pass through flow control NOTE DTE speed and parity are set automatically Auto answer is enabled or disabled by S register SO Option can be changed only when Modem is off line Default settings where applicable are in bold face If user profile 1 is active options are controlled for Hayes mode operation by given commands or Summary Setup Do not change via front panel except via Summary Setup Modem 34336 Table 5 2 Hayes Mode Result Codes CODE MEANING A Command line executed without errors CONNECT Carrier detected at 0 300 1200 or 2400 bps basic code set RING Ringing signal detected in answer mode When the Modem detects a ring it sends a RING result code unless it is in the process of accepting a command However the Modem answers the call only if itis set for automatic answer or is given an A command RN NO CARRIER Carrier lost or never detected ERROR Error in command line invalid command command line exceeds 40 characters or invalid character format CONNECT 1200 Carrier detected at 1200 bps NO DIALTONE No dial tone detected EN BUSY Busy sig
87. from the diagnostic port will be ignored You can also access two remote test options from REMOTE 1 screen by selecting TEST These test options remote digital loopback and remote digital loopback self test are described in Chapter 7 Exiting from Remote Control Mode To exit from remote control mode press the ENT pushbutton five times in succession on the front panel of the controlling modem If the remote modem resets as a result of a configuration change the local modem will appear to have no control To remedy this situation press the ENT button five times 4 8 2 REMOTE CONTROL THROUGH A RACK CONTROLLER When installed in a rack enclosure equipped with an intelligent rack controller the Modem 34336 can be used to control e Another modem in the same rack or e A remote modem connected to any modem in the rack address control mode only Modem 34336 Remote control through a rack controller is an especially valuable capability for modem used in high density 16 slot enclosures The low profile modems specially designed for these racks are manufactured without an LCD user interface or control pushbuttons One way to access the low profile modems to monitor test or configure tham is by using the modem control feature described below The controlling modem must be a Modem 34336 equipped with a front panel LCD and pushbuttons Low profile rackmount versions of these modems cannot be used as controlling modems because
88. he second page of the LOCAL TEST menu Select ALBX The ANALOG LOOP EXT screen is displayed with ON and OFF as the possible selections Select ON to activate the test In general the DSR during ALB test option discussed in Chapter 2 should be left ON default selection to avoid disrupting the DTE and DTE software operations The EIA status screen is displayed while the test is being conducted If no external loopback is present the status screen displays an IDLE message If a loopback is present handshake sequence codes appear H 01 etc followed by the modem speed Ensure that test data is being generated and watch for data errors By transmitting test data and comparing it with the received copy the DTE and modem are checked for proper operation During the ALBX test RD receive data may appear on the status screen even though no data is being received On a flat line the Modem in ALBX test mode trains and remains running across the following range of signal loss in V 32 mode 0 51 dBm 0 52 dBm at 12 000 bps for V 33 operation 0 47 dBm and for Bell 208A B operation 0 37 dBm If signal loss exceeds the limits the test may not start or may be halted During the ALBX test the modem attempts to retrain upon loss of carrier In switched carrier mode the modem attempts to retrain upon loss of RTS To end the test press the ENT pushbutton to return to the ANALOG LOOP EXT screen Then select OFF 7 0 Diagnostics
89. he Modem only and are intended only for V 33 or Bell 208A B operation For Bell 208 operation see also the Satellite Delay and Turnaround Delay options The Carrier Type option is available for V 25 bis Dumb Leased line modes e SWITCHED SWITCH For 2 wire applications the carrier type option must be set for switched carrier operation CONSTANT Constant or continuous carrier can only be used for 4 wire leased line applications although such applications may also use switched carrier Modem 34336 The CTS option is available for 4 wire Leased Line modes It applies only to 4 wire leased line applications using constant carrier RTS The CTS signal follows RTS ON CTS is always ON NOTE The Modem also supports a CTS to EIA option which is described earlier in this chapter under EIA OPTIONS The RTS CTS Delay CTS Delay option is available for V 25 bis Dumb Leased line modes The available RTS to CTS delay settings are 0 15 50 or 150 ms However the only available choices for 208A B operation are 50 and 150 ms If you select 0 or 15 ms the actual delay in 208A B mode will be 50 ms NOTE RTS to CTS delay is not effective if the CTS option is set to ON always ON For V 33 operation RTS to CTS delay is effective only for 4 wire leased line applications that use constant carrier The PHONE screen for storing a telephone number and Auto Recovery are discussed in Sections 4 2 amd 4 3 Th
90. he Modem to wait for a dial tone before proceeding Adjust the wait time default 30 seconds by changing the value in register S7 If no dial tone is detected within the specified time the Modem hangs up and gives a NO DIALTONE result code if the result code is enabled by the X command Modem 34336 Z Recall Stored User Profile The Z command resets the modem and recalls a profile of the modem configuration settings previously saved using the amp W command The profile is designated as profile 0 or profile 1 when it is saved using the amp W command e Pause A comma causes the modem to pause for 2 seconds or time specified in register S8 before processing the next character in a dial string or command The Pause command is used to place an outside call through a PBX switchboard where 9 must be dialed to gain outside access the pause allows time for the dial tone to occur before the modem dials the number AT D9 3331234 Similarly a comma may be used to cause the Modem to wait for a second dial tone before beginning to dial a telephone number Use multiple commas to increase the pause time Forced Command State A semicolon placed at the end of a dial command causes the Modem to return to the command state after dialing without disconnecting The following examples illustrate how the command is used The first example is a banking transaction The command AT D333 1234 dials the bank s phone number an
91. he answer mode The modem will not execute any command entered in the command line after A The A command is used to transfer a call between two individuals to a communication between their computers One person enters A while the other enters D A Repeat Previous Command A is most commonly used to redial a busy telephone number The AT prefix is not used with A and no carriage return is required Commands are available for repetition in the command buffer only until AT is entered or power to the unit is turned off A will not work following an AT or after the power has been turned off and back on D Originate Mode For Dialing The modem dials the number that follows and attempts to go on line The dial command D is followed by either a telephone number to be dialed or a string consisting of a phone number and dial command modifiers e g T P An example of the D command is shown below AT D3331234 In response to the command above the Modem dials the telephone number 333 1234 and then waits for a carrier tone from the remote modem default wait time is 30 seconds If the modem is able to establish a call it gives a CONNECT result code indicating that it is on line If it cannot connect it issues a different result code such as NO CARRIER BUSY or NO DIALTONE The characters that can be dialed are 0 through 9 A B C D and AT D the dial command without a telephone number causes the modem to
92. hone numbers password commands and passwords amp Z is used to store phone numbers password commands and passwords To unlock the amp V and amp Z commands enter the following command substituting your password for SECURITY AT amp Z1 ASECURITY The amp V and amp Z commands are accessible To re lock the amp V and amp Z commands enter AT Z The DTE responds with OK and the amp V or amp Z commands will not function until they are unlocked 3 Programming security callback operation Use the commands AT amp Z and P to specify the callback phone number and password to be used The following example programs memory location 3 for callback operation AT amp Z3 T5551212 PVIOLET The callback number in this example is 555 1212 with T used to specify tone dialing the password is VIOLET A remote user can now call from the specified callback number 555 1212 After the modems connect the remote user presses the Enter key The DTE prompts the user to enter the assigned password by displaying the PASSWORD query Upon receipt of the correct password VIOLET the local Modem calls back the remote user at 555 1212 Once this connection is established data may pass freely NOTE Callback numbers and passwords may be stored only in memory locations 2 through 9 4 Programming pass through operation Use the commands AT amp Z and P to specify the password used for pass through operation The following example programs memory loca
93. i ies 113 7 2 Symptoms And Scope Of The Problem 113 7 9 PhysicalInsp ction 2 Roa RE LEURS 114 7 4 Overview Of Modem Diagnostics sss 114 7 5 How To Select And Activate Tests oooooncnnnonionnnocnconncnnnnnnnnnns 115 7 5 1 FrontPanel 115 7 5 2 Running Tests In Hayes Mode sse 115 745 3 Remote Test Control terr teorie dina eoo cds 115 Table of Conents 7 6 Diagnostic Monitoring Status Screens TOAN ETA Status 9 ERE 10 2 Other Status OTC 116 7 7 Local Moder Dias Ossa ita ies 118 7 7 1 Analog Loopback ALB Test see 118 7 7 2 Analog Loopback Self Test ALBST 119 7 7 3 Analog Loopback Self Test With Errors ST E 120 7 7 4 External Analog Loopback ALBX Test 121 7 7 5 External Analog Loopback Self Test ALXST 123 7 7 6 Digital Loopback Test DLB eee 124 7 8 Remote Modem Diagnostics 7 8 Remote Digital Loopback RDL Test 7 82 Remote Digital Loopback Self Test RDLST 127 Appendix A DB25 Pin Assignments 129 Appendix B Quick Setup Configurations 5 130 Appendix Summary Setup siio terc ecrire etbee ticas 135 Appendix D Diels uec dou adn 144 Appendix E LCD Flow Charts caciones 147 1 0 S
94. ick Setup configuration except as follows SPEED TYPE is AUTO DATA FORMAT is synchronous V 13 OPERATION is set to TX and RX CARRIER is constant Summary Setup V 32 208 option data pump options group is set to 1 enable Effectve for synchronous modes only Appendix C Summary Setup C 1 Introduction to Summary Setup Summary Setup is designed to allow experienced users to quickly change option settings for any mode There are three Summary Setup screens SETUPS AT PROFILES and S REG They are briefly described on the next page Because the screens show numerical codes with very little explanation Summary Setup is recommended for experienced users only Changes made through Summary Setup modify the active modem configuration and are saved to memory when you exit Summary Setup ACCESSING SUMMARY SETUP Summary Setup is accessed from screen 6 of the SETUP menu The SUMMARY screen includes a four digit checksum value to the right of the word SUMMARY This number changes if any of the option settings are changed You can determine 2fany of the modem s settings were changed but you cannot determine what options were changed From the SUMMARY screen choose SETUPS to change options AT to change options that are associated AT commands or S REG to change S Register values See Figure C 1 KEY TO THE SUMMARY SETUP SCREENS Each Summary Setup Screen is essentially the same brief descriptive information on the t
95. ific site examine that site Check the installation of the modem and DTE Are all cables in good condition and fully connected Are all components in the system receiving power Inspect the system as thoroughly as possible 7 4 Overview Of Modem Diagnostics Once you identify the symptoms and conduct a physical inspection of the sites in question you can use diagnostic monitoring and testing to further isolate the problem The Modem is equipped with diagnostic capabilities enabling you to locate faults quickly and easily The diagnostic features of the Modem fall into two categories local and remote as listed below There are six types of local modem diagnostics Analog loopback ALB Analog loopback self test ALBST or ST Analog loopback self test with errors ST E External analog loopback ALBX External analog loopback self test ALXST Digital loopback DLB There are two types of remote diagnostics Remote digital loopback RDL Remote digital loopback self test RDLST The sequence in which you should conduct diagnostic tests depends upon the symptoms you identified the availability of personnel at the remote site and external test equipment The self test pattern generator and pattern detector built into the Modem alleviate the requirement for external test equipment With the non self tests use either a standard DTE or an external bit error rate test BERT to generate test data and compare it with
96. ing on your application The appropriate carrier detect level screen is displayed For leased line use the carrier detect level can be set for 43 33 or 26 dBm The default setting is 26 dBm For dial line use the carrier detect level can be set for 51 41 or 34 dBm The default setting is 51 dBm The Transmit Level option is available for all modes It controls the modem s transmission level To make a selection first select either LEASED or DIAL from the TRANSMIT LEVEL screen For leased lines the transmission level can be set between 0 and 15 dBm in 1 dBm steps The standard setting is 0 dBm Use pushbuttons 1 and 3 to select the desired transmission level For dialup applications the transmission level for dial lines can be set as either programmable if you are using RJ 45S connectors or permissive fixed at 10 dBm 1 dBm which is the most common setting The Signal Quality option is available for all modes It sets the threshold for the ER error indication during normal operation You can choose either 10 3 one error in 1000 bits or 10 5 one error in 100 000 bits Signal quality along with carrier detect also controls the threshold the modem uses as a criterion for entering the Leased Line Auto Recovery mode 3 0 Modem Setup Options The Compromise Equalizers option is available for all modes NOTE The compromise equalizers affect only V 32 operation 4800 to 14 400 bps asynch
97. ions 6 4 V 25 bis Result Codes Table 6 3 explains the result codes or responses that are displayed on the DTE monitor during V 25 bis operation 6 5 DTR Dialing In V 25 bis Mode An alternative to using the CRS command to dial a stored number is to use the DTR dialing option With DTR dialing enabled the autodialer dials the number stored in memory address 0 when DTR goes high for at least 50 ms To enable V 25 bis DTR dialing use the Summary Setup feature as described in Appendix C to change the parameter for V 25 bis DTR dialing to 0 Do not select DTR dialing via the front panel DIALER screen it does not enable DTR dialing for V 25 bis mode Table 6 3 V 25 bis Result Codes Con does not contain a stored number CFI NT Call failure no answer tone detected e Invalid command entry List of stored numbers is followed by memory address stored number next memory address next stored number etc Command accepted waiting for next command A semicolon may be used to separate parameters e g LSN 4 5559797 7 0 Diagnostics The troubleshooting information in this chapter applies to all Modem applications all dialup and leased line modes unless specifically stated otherwise For specific test procedures turn to one of the following sections in this chapter Section 7 7 Local Modem Diagnostics Section 7 8 Remote Diagnostics 7 1 When And Why To Test If you experience communi
98. ions For Hayes mode options see 5 0 Hayes Emulation Mode Table 2 1 Available Quick Setup Configurations QUICK SETUP IDENTIFIED ON LCD DESCRIPTION QUICK SETUP lt 01 gt W DIAL QUICK SETUP lt 02 gt QUICK SETUP lt 03 gt V25 DIAL Syn_c QUICK SETUP lt 04 gt V25 DIAL Syn b QUICK SETUP 05 2 W DIAL DUMB QUICK SETUP 06 W LEASED OR 2 WIRE DIAL HAYES EMULATION MODE This dial mode for use over ordinary phone lines allows the Modem to automatically dial autodial a previously stored phone number and respond to Hayes commands This mode is compatible with communication software packages that use Hayes style AT commands The Hayes mode Quick Setup is the factory default configuration for the Modem 2 WIRE DIAL V 25 bis MODE ASYNCHRONOUS In V 25 bis mode the Modem operates in conformance with CCITT recommendation V 25 bis allowing you to store and direct dial or autodial phone numbers from the DTE Use Quick Setup 2 if the DTE connected to the modem is asynchronous 2 WIRE DIAL V 25 bis MODE SYNCHRONOUS CHARACTER ORIENTED Same as Quick Setup 2 except for data protocol Use Quick Setup 3 if the DTE is synchronous character oriented bisynchronous 2 WIRE DIAL V 25 bis MODE SYNCHRONOUS BIT ORIENTED Same as Quick Setup 2 except for data protocol Use Quick Setup 4 if the DTE is synchronous bit oriented SDLC HDLC 2 WIRE DIAL DUMB MOD
99. is on line RTS The CTS signal immediately follows the RTS signal with no delay TRUE The CTS signal follows DTR CTS can also be set to be ON at all times regardless of DTR by using the Summary Setup feature However if CTS on off is selected from DCE DTE screen 1 V 42 flow control while active overrides the CTS ON selection To set CTS ON refer to Appendix C Note that if you set CTS to ON using Summary Setup and then make a selection from the CTS to EIA screen that selection cancels the Summary Setup CTS ON selection 3 0 Modem Setup Options NOTE The Modem also supports a CTS option intended only for V 33 and Bell 208A B operation described later in this chapter The CD to option is available for Hayes V 25 bis and Dumb modes NORMAL Carrier Detect CD is on while the modem is on line TRUE CD follows supplied from the DTE TOGGLE CD turns on whenever DTR is present and then toggles off for 500 ms upon disconnect allowing the attached DTE to recognize that the call is ended and the connection is dropped The DSR to EIA option is available for Hayes V 25 bis and Dumb modes NORMAL Data Set Ready DSR is on while the modem is on line TRUE DSR follows DTR supplied from the DTE CROSSOVER XOVER DSR is ON without DTR and toggles for 500 ms upon local or remote disconnect The DTR from EIA is available for all modes It allows you to force the Data Termina
100. isable The Modem will not pass flow control characters from the remote modem to the local DTE The Link Flow Control option is for Hayes V 25 bis Dumb Leased Line modes except V 33 This option is effective only if buffer mode speed conversion is enabled and an error correction link is not established Modem 34336 Enable The Modem will check for X ON X OFF DC1 DC3 flow control characters received from the remote modem to determine whether to stop or start restart data transmission to the remote modem A DG3 or DC2 control character will cause the Modem Modem 3242 S to stop data transmission and hold data in its buffer until it receives a DCI control character which instructs the modem to resume transmission Disable The Modem will ignore X ON X OFF DC1 DC3 flow control characters received from the remote modem Slaved Link flow control is controlled by the DCE DTE Flow Control option If DCE DTE Flow Control is set to NONE or CTS Link Flow Control is disabled Otherwise it is enabled The V 32 Mode option Hayes V 25 bis Dumb and Leased Line modes except V 33 This option is used to select CCITT V 32 bis operation or V 32 extended operation When V 32 bis mode is selected factory default setting the follow ing are available RRP Rate Renegotiation Procedure data rate of 7200 bps RATE screen that allows you to manually initiate RRP RRP enables the modem to automatically fall back orfall f
101. ister S18 is set to zero on powerup or by the command AT Z or AT S18 0 S25 Delay To The effect of the value stored in register 25 is dependent on the operating mode as explained below Synchronous mode 1 Before the Modem examines the state of DTR a delay occurs after a call is established The duration of the delay is the value specified in S25 in seconds This allows the operator time to disconnect the Modem from an asynchronous data terminal and attach it to a synchronous terminal without forcing the Modem back into the command state Asynchronous mode and synchronous modes 1 and 3 A change in DTR ON or OFF lasting for less than the value in register 525 in hundredths of a second is ignored by the Modem 526 RTS To CTS Delay Interval This register affects synchronous operation only With the command amp R in effect CTS is turned on in response to an OFF to ON transition of RTS from the local DTE after the delay specified by the value in register 526 but only if the Modem is on line and ready to receive synchronous data Modem 34336 5 4 Selecting Options In Hayes Mode In Hayes mode options may be selected by using one of the following e AT commands Table 5 1 The front panel The Summary Setup feature The easiest way to change options in Hayes mode is to use the AT commands listed in Table 5 1 or the Modem s front panel The following guidelines apply to option selection in Haye
102. l Ready DTR signal on TRUE which may be needed if your computer or communication software does not supply a DTR signal NORMAL DTR is supplied by the DTE TRUE The DTR signal is internally forced ON regardless of the DTR status at the interface The DTE Control Of ALB ALB DTE Ctrl ed option is available for all modes Analog loopback ALB testing can be initiated from the DTE via pin 18 Positive voltage activates the test whereas negative voltage results in normal operation Disabling this option keeps the modem from responding to pin 18 The DTE Control Of RDL RDL DTE Ctrl ed option is available for all modes Remote digital loopback RDL can be initiated from the DTE via pin 21 Positive voltage activates the test whereas negative voltage results in normal operation Disabling this option keeps the modem from responding to pin 21 Modem 34336 The Test Mode to EIA option is available for all modes It controls pin 25 the test mode indicator on the RS 232 interface connector NORMAL TM output is high active only during test modes e TRUE output is high all of the time 3 3 7 MODEM SETUPS The options listed below through RTS CTS DELAY are available through the MODEM SETUPS screens The Carrier Detect option is available for all modes It selects the carrier detect level To make a selection first select either LEASED or DIAL from the CARRIER DET LVL screen depend
103. lar to the one shown below D TR MR RS CS TI 9600 TD and RD flash to indicate that the modem is transmitting and receiving data The speed may be other than 9600 bps The Modem automatically adjusts to the speed of the remote modem provided the remote unit is a compatible modem Terminating a Call To terminate a call first enter the escape sequence When the OK response appears on the DTE screen enter the command AT An alternate method is to drop the DTR signal from the DTE If you are using a computer with a communication software program follow the program s instructions for initiating and terminating calls 2 4 2 2 WIRE DIAL V 25 BIS MODE QUICK SETUPS 2 3 AND 4 The Modem supports three types of V 25 bis operation asynchronous character oriented synchronous or bit oriented synchronous There is a Quick Setup for each V 25 bis type Modem 34336 For V 25 bis operation the Modem must be configured to use the same data protocol as the attached DTE V 25 bis mode operation and commands are explained in detail in Chapter 6 0 V 25 bis Audodialer Asynchronous V 25 bis Operation The data format of the DTE should be set to 7 data bits with even parity and one stop bit The default DTE interface rate is 38 400 bps in asynchronous mode V 25 bis commands can be entered from the DTE keyboard Example CRN 5551234 In response to this command the Modem sends a VAL result code back to the DTE in
104. layed with ON and OFF as the possible selections Select ON to activate the test The EIA status screen is displayed while the test is being conducted If ER is present on the front panel data errors occurred The ER indicator may flash on when the test is first started but it should quickly go out and remain off until the end of the test To end the test press the ENT pushbutton to return to the SELFTEST screen Then select OFF 7 7 3 ANALOG LOOPBACK SELF TEST WITH Errors ST E In the analog loopback self test with errors data is sent and received by an internal 511 bit pattern generator and receiver No DTE or external BERT is necessary This test differs from the ALBST in that errors are injected into the data flow every few seconds The data flow is the same as that shown in Figure 7 2 the ALBST 7 0 Diagnostics To run the test go to the LCD MAIN MENU From page 2 of the LCD MAIN MENU select TEST This takes you to screen 1 ofthe LOCAL TEST menu where ST E is visible as one of the selections Select ST E The SELFTEST W ERROR screen is displayed with ON and OFF as the possible selections Select ON to activate the test The EIA status screen is displayed The ER indicator should flash every few seconds indicating that the pattern generator and detector are working Errors are injected every few seconds To end the test press the ENT pushbutton to return to the SELFTEST W ERROR screen Then select OFF 7 7 4 EXTERNAL AN
105. le are in bold face f user profile 1 is active options are controlled for Hayes mode operation by given commands or Summary Setup Do not change via front panel except via Summary Setup 5 0 Hayes Emulation Mode Table 5 1 continued Hayes Compatible Commands COMMAND FUNCTION EXPLANATION Product Code Or Checksum Requests product code Requests checksum for the Modem s software Only a portion of the checksum displayed via the front panel is displayed in decimal format Requests verification of software checksum Requests the following for each EPROM programmable memory unit chip part and revision number checksum Reserved Link Dial L specifies LINK function when used as a dial command modifier Speaker Volume Low speaker volume Medium volume High volume Speaker Control Speaker always OFF Speaker ON until carrier is detected Speaker always ON Speaker OFF during dialing otherwise ON until carrier is detected Forced On Line Forces Modem to on line state Forces Modem to on line state and initiates equalizer retrain Pulse Dial No parameters but the default is T for tone dial Send Result Code Send result codes Withhold result codes quiet Withhold result codes for incoming calls only quiet answer Modem 34336 Table 5 1 continued Hayes Compatible Commands COMMAND FUNCTION EXPLANATION S Modify S Register Parameters are register an
106. le 1 as the default You can achieve the same effect by issuing the amp Y command amp Y0 or amp Y1 AT PROF Factory default settings are shown below ATbeflmqvxy AT amp ci 010210141 1i Move the Move the 7 cursor one cursor one Exit to the A H position to position to AT Profiles the left the right Screen TRANSMITTER RECEIVER The screen intially displays the H AT commands Move the Increase Move the i and one cursor to the value of cursor to amp the previous the blinking the next i section of character section of commands by one commands ATbeflmqvxy AT amp cdgjlpqrsx 500 518 525 526 AT abcdeh kmnpq t vx 1210000000 001 000 005 001 3150101630323300100 AT Commands 010210141 most are for V 42 options S Registers AT8 Commands AT Commands Figure C 3 Selecting a Profile NOTE Refer to Table 5 1 Hayes Compatible Commands for an explanation of the commands represented in this diagram Appendix C Summary Setup C 4 S REG Screen The S REG screen may be used to read or change the value stored in an S register For more information see 5 3 S Registers NOTE Not all S registers are intended for user access Do not change the value of an A register if you do not know the register s function Doing so can adversely affect the modem s configuration The S REG Screen displays an S r
107. left arrow pushbuttons to go to the digit you want to change Then use pushbutton 1 to decrease DEC a number or pushbutton 3 to increase INC it If SLOT C is selected only modems in the same rack as the controlling modem may be specified slots 1 16 However if ADDR C is selected you can specify any modem in the same rack with the controlling modem or a remote modem connected to any modem in that rack Figure 4 1 The remote modem may be in a rack without a rack controller or it may be a standalone modem When the address or slot number you want is shown press ENT The LCD will return to REMOTE screen 2 3 Initiate control After entering the address or slot number of the modem to be controlled select CTRL from REMOTE screen 2 CTRL will flash on and off for about seven seconds until the connection to the specified modem is made When the connection is made all characters on the LCD of the controlling modem will be in lower case instead of capitals this indicates that the screens displayed are for the controlled modem Buttons pressed on the front panel of the controlling modem will affect the controlled modem and not the controlling modem If the specified modem is not present or is not working the LCD will display a NO RESPONSE message If a rack controller is not installed on the rack enclosure or is not working CTRL will continue to flash on and off indefinitely until you exit from the address or slot c
108. locations for storing telephone numbers passwords and the password commands listed in Table 4 2 To implement a security command use the Hayes AT amp Z command to store the command in a specific memory location The password commands are listed in Table 4 2 and explained in detail in the sections that follow Table 4 2 Password Commands COMMAND FUNCTION EXAMPLE MEM LOC Set change administrative password password protects use of certain Hayes commands ASECURITY Set password for pass through PYELLOW operation or security callback operation 4443535 PGREEN User defined text string Used to send a response to the remote terminal user after a valid password is received UCONNECTED Command string stored using AT amp Z commands Each command will function only in the listed memory locations Modem 34336 Rules for using passwords and password commands are listed below Memory locations 0 and 2 9 may be used for storing phone numbers locations 2 9 may be used to store passwords The entire command string including the AT amp Z command cannot exceed 40 characters e Passwords and commands may be entered in capitals or lowercase letters They are stored and displayed as capitals For password pass through operation must be the first character in a storage location For security callback operation a phone number must be listed first in a storage location Special characters
109. loopback 4 wire external analog loopback self test 4 wire front panel TIA EIA or front panel Hayes control AC Power Stand alone 90 132 VAC 60 Hz 5 Rackmount 117 220 VAC Power Consumption 13 watts Heat Generation 44 BTU hr Ringer Equivalence 0 7B Environment Ambient temp 32 to 120 F 0 to 49 C Storage temp 20 to 180 F 7 to 82 C Relative humidity 5 to 90 at 24 C 75 F non condensing Size stand alone unit 2 5 H x 9 7 W x 10 1 D 6 4 x 24 6 x 25 7 cm Weight Stand alone 4 1 lb 1 9 kg Rackmount 2 Ib 0 9 kg 2 0 Quick Start All information in this manual applies to both the stand alone and rack mount versions of the Modem 34336 QUICK SETUPS FOR A QUICK START The simplest and fastest way to set up the Modems for immediate use is to select one of the factory preset Quick Setup configurations Quick Setups are explained in Section 2 3 following installation instructions Section 2 1 and a brief introduction to the Modem s front panel display and controls Section 2 2 2 1 Installation 2 1 1 UNPACKING Many early modem failures are a result of damage done during shipping Visually inspect your modem Keep the original shipping carton in case you have to return the modem for any reason 2 1 2 PACKAGE CONTENTS All models include the following cables A two conductor crossover cable for a dial line connection e A four conductor cable for a leased line
110. ly Either error correction standard V 42 or MNP may be enabled for dial or leased line operation However error correction can function only if all of the following conditions are present The modem that the Modem is communicating with must be equipped with the same type of error correction V 42 V 42 bis or MNP The same type of error correction V 42 V 42 bis or MNP must be enabled at both ends of the communication link Both communicating modems must be configured for asynchronous data format The connected systems must support data flow control have buffering capabilities The V 42 and MNP error correction options listed and described below are effective only when all of the conditions listed above are present Error correction options cannot be changed when the modem is on line For valid test results disable error correction before running diagnostic tests User selectable options allow you to configure the Modem for V 42 LAPM error correction only MNP error correction only or V 42 error correction with MNP as the fallback error correction protocol Data compression may also be enabled by selecting either V 42 bis or MNP class 5 error correction Other error correction options are also available Modem 34336 The available error correction options are listed below V 42 Mode DTE Speed MNP Class class limit DTE DCE and DCE DTE Flow Break Handling Control options e V 42 Selection e Flyb
111. make further adjustments When you select a Quick Setup the Modem uses internal memory to automatically set all of its options to the chosen configuration All previously stored option settings are overwritten The Quick Setup does not affect telephone numbers stored in the modem s memory You can customize a Quick Setup configuration by changing specific option settings see 3 0 Modem Setup Options How To SELECT A QUICK SETUP To activate a Quick Setup configuration follow the steps below As you do you may find it helpful to refer to the LCD flow chart at the back of this manual 1 Press the ENT enter pushbutton on the modem s front panel Screen 1 of the MAIN MENU is displayed MAIN MENU lt 1 gt TALK QUICK DIAL 2 Press pushbutton 2 Screen 1 of the QUICK SETUP menu appears QUICK SETUP lt 01 gt 2 W DIAL Hayes 3 Use the front panel arrow pushbuttons to move through the QUICK SETUP menu There are 12 QUICK SETUP configurations Each configuration is discussed in Table 2 1 4 When the LCD shows the Quick Setup configuration you want press pushbutton 2 The bottom line of the display will flash 5 Press ENT You will see SETUP screen 1 Press ENT a second time The modem resets and the selected Quick Setup takes effect Modem 34336 All options for each Quick Setup configuration are listed in Appendix B If you want to customize your Quick Setup configuration see 3 0 Modem Setup Opt
112. me Guard Tones V 13 Operation See notes on page 127 APPENDIX B Quick Setup Configurations Table B 1 continued Quick Setup Configurations Default Settings Listed by Mode or Type of Operation V 25 bis 2 WIRE 4 WIRE BELL OPTION HAYES ASYNC DUMB LEASED LEASED V 33 V 33 and Carrier Switched Switched Switched Switched Switched Constant Bell 208A B options CTS RTS RTS RTS RTS RTS ON RTS CTS Delay 0 Auto Auto Recovery Recovery Select Options Return from Auto Recovery Auto Recovery Test Interval LCD Intensity See notes on next page Modem 34336 Table B 1 continued Quick Setup Configurations Notes V 25 bis synchronous configurations character and bit oriented are the same as the V 25 bis asynchronous confiugration except as follows V 42 MODE is OFF BUFFER is disabled DATA FORMAT is synchronous PARITY is ODD RX SPACE DISCONNECT is disabled TX SPACE DISCONNECT is disabled DIALER MODE V 25 bis is Sync c for character oriented mode Sync b for bit oriented mode Leased line originate and answer Quick Setups ORG and ANS on the LCD are the same except that ANSWER ORIGINATE is set to ORIGINATE for the originate Quick Setups and is set to ANSWER for the answer Quick Setups 2 wire or 4 wire The V 32 208 auto mode Quick Setup configuration is the same as the Dumb mode Qu
113. mmand or after the dial command if it is terminated with a semicolon See the example below AT M2 1 D 555 1212 S2 10 The above command instructs the Modem to keep the speaker on M2 send word result codes V1 dial D 555 1212 end dial command set register 2 to 1 S2 1 and go on line and wait for carrier O Characters not in the command set are ignored during the dial command Therefore you can include punctuation or spaces in the telephone number for easier reading See the example below AT DT 9 212 555 1234 or AT DT 9 212 555 1234 A Command Repeats the commands included in the previous command line Because the AT is also repeated no AT is needed to begin this command nor is a carriage return needed A is useful for redialing a telephone number Backspace Key The backspace key deletes the last character entered provided there is no intervening carriage return and is used for simple editing Carriage Return CR A carriage return is required at the end ofa command line The modem will not execute a command without it A carriage return is sent from the DTE keyboard A period which may be entered via the modem s front panel PHONE LCD screen has the same function as a carriage return On most keyboards the carriage return CR key is labeled Enter or Return 5 0 Hayes Emulation Mode Dial Command Modifiers Several modifiers can be used with the basic D dial command to alter dialing operatio
114. modem as explained in the previous section Auto answer must be enabled on the answer modem Modem 34336 Table 4 1 Dialing Control Characters Character Function A D Used in some PBX applications tone dialing only Links a phone number to another number to be dialed as an alternate Sets tone dialing mode Sets pulse dialing mode Configures modem for Dial Line Auto Recovery Requires prefix See DIAL LINE AUTO RECOVERY section later in this chapter W or colon Wait 30 seconds for dial tone before proceeding comma Inserts 4 second pause period Marks end of phone number dash Used only for clarity no function space Used only for clarity Dial tone dialing only Dial tone dialing only A are used in some private branch exchange PBX applications The and symbols are sometimes used for access to remote computer systems 4 0 General Operation and Special Features 4 3 1 AUTODIAL BACKUP The Modem automatically dials the stored number to connect over the backup line if it detects poor signal quality ER or a loss of carrier detect CD on the leased line The criteria used by the Modem in assessing the condition of the leased line depend upon the settings of the Signal Quality option one error in 10 or 10 bits and the Carrier Detect Level option 43 33 or 26 dBm When Dial Backup
115. nal detected NO ANSWER No period of silence detected This code appears only if wait for silence before dialing is included in the dial string CONNECT 2400 Carrier detected at 2400 bps CONNECT 1275 Modem is on line in V 23 mode 1200 75 CPE CONNECT 12 0 Carrier detected at 12 000 Carrier detected at 12 000 bps CONNECT 14 4 Carrier detected at 14 400 bps 5 0 Hayes Emulation Mode Table 5 2 continued Hayes Mode Result Codes DIGIT CODE WORD CODE MEANING 1 CONNECT 4800 Carrier detected at 4800 bps 5 8 CONNECT 9600 Carrier detected at 9600 bps 0 1 2 LINKING Modem is dialing numbers that are linked using the L link dial modifier Note Four additional word codes are BUFFER MNP V42 and V42 bis followed by the DTE interface speed These codes indicate if the Modem is in buffer MNP or LAPM V 42 V 42 bis mode The corresponding digit codes and speeds they indicate are listed below with all speeds in bits per second BUFFER 28 19200 29 9600 30 4800 31 2400 32 1200 33 600 34 300 35 110 53 38400 MNP 36 19200 37 9600 38 4800 39 2400 40 1200 41 600 42 300 43 110 54 38400 V42 44 19200 45 9600 46 4800 47 2400 48 1200 49 600 50 300 51 110 52 38400 V42 bis 55 38400 56 19200 57 9600 58 4800 59 2400 60 1200 61 600 62 300 63 110 Modem 34336 Table 5 3 S Register Functions Only registers intended for user access are listed
116. nalog loopback test O disable 1 enable CTS O normal 1 follow RTS 2 true 3 on Carrier detect O normal 1 true 2 toggle DSR O true 1 normal 2 crossover gt gt O normal 1 true Appendix C Summary Setup V 42 ERROR CORRECTION OPTION NOTE V42 lt 1 gt and V42 lt 2 gt are displayed to help indicate the relative positions of individual options across the LCD V42 lt 1 gt V42 lt 2 gt 00335311 200001021 ES Y Y LEASED LINE OPTIONS LE 10020010 Link flow control O disable 1 enable 2 slaved DCE pass through flow control O disable 1 enable Selective retransmission O disable 1 enable V42 bis O disable 1 enable V 42 protocol OZLAPM only 1 MNP only 2 LAPM MNP DTE pass through flow control O disable 1 enable Flyback buffer O enable 1 disable Break handling O none 1 destr expedited 2 nondestr expedited 3 non destr non expedited MNP class limit O class 1 1 class 2 2 class 3 3 class 4 4 class 5 Flow control DCE to DTE O none 1 CTS 2 DC1 DC2 3 DC1 DC3 Flow control DTE to DCE O none 1 RTS 2 DC1 DC2 3 DC1 DC3 Parity 0 none 1 odd 2 even 3 mark 4 space DTE speed bps 0 115 2 K 1 57 6 K 2 38 4 K 3 19 2 K 4 9600 5 7200 6 4800 7 2400 8 1800 9 1200 A 600 B 300 Auto recovery test interval min 0210 1 20 2 40 3 60 Au
117. ne number can be stored per cell To store a phone number use the right and left arrow pushbuttons to go to the digit you want to change The character at the current cursor location flashes Use pushbutton 1 to decrease a number at the current cursor location or pushbutton 3 to increase a number Use pushbutton 2 CTRL to sequence through the dialing control characters listed below Use the arrow pushbuttons to move on to the next digit or character to be changed The phone number is saved when you return to the MAIN MENU 4 3 Leased Line Auto Recovery When conditions on the leased lines deteriorate the Leased Line Auto Recovery feature allows the Modem to automatically restore operation for a leased line application by using dial lines as a backup The Modem uses signal quality and loss of carrier detect to determine if line conditions are unsatisfactory Leased Line Auto Recovery is accessed via the AUTO RECOVERY screen on the front panel LCD The following conditions are required for Leased Line Auto Recovery operation Leased Line Auto Recovery must be enabled using the Leased Line Auto Recovery Select option on both communicating modems The Leased Line Auto Recovery Select Return and Test options must be set correctly on both communicating modems as explained in the following sections A dial backup line or lines must be installed The phone number to be dialed the backup line must be stored in the originate
118. nformation see Section 5 2 7 5 3 REMOTE TEST CONTROL You can configure the Modem to ignore or accept requests from remote modems to initiate tests on your Modem To access the remote test control option select TEST from SETUP screen 4 Then select RMT from the TEST OPTIONS screen From the REMOTE TEST screen select ENABLE to allow remote test initiation or DISABLE to refuse remote test requests 7 6 Diagnostic Monitoring Status Screens To obtain additional information about the status of the communications system observe the status screens described in the following sections To view these screens push the ENT button until the status screen appears Use the right arrow pushbutton to advance to other status screens 7 6 1 ELA STATUS SCREEN The EIA status screen indicates the operational status of the modem and the condition of certain EIA RS 232 D TR MR RS CS TD leads The abbreviations that appear 9600 TM ER CD RI are identified below however only a few of these abbreviations are displayed during actual operation Modem 34336 D Dial line occupied R Ringing appears in same position as D S Connection secured by security handshake S appears in same position as D S and D may flash alternately TR Data Terminal Ready MR Data Set Ready RS Request to Send CS Clear to Send TD Transmit Data 9600 4800 etc Data speed idle the Modem is off line or H 01 H 1
119. ng This does not apply however if both modems are installed in the same rack and the rack is equipped with a rack controller 4 8 1 DIRECT MODEM TO MODEM REMOTE CONTROL REMOTE screen 1 on the LCD allows you to use one Modem 34336 to control the front panel of another Modem 34336 via a phone link REMOTE screen 2 is discussed in Section 4 8 2 4 0 General Operation and Special Features Control Procedure Modem to Modem Enabling Modem to Modem Remote Control Mode To remotely control a modem connected by a direct phone link access REMOTE screen 1 shown below REMOTE CONTROL If you select CONTROL you will be able to control the front panel of the remote modem from the front panel of the modem you are using When you select CONTROL you will see on the LCD of the modem you are using whatever is currently displayed on the LCD of the remote modem The characters on the LCD will be displayed in lower case this is to let you know you are actually looking at a copy of the LCD of the remote modem Buttons pressed on the front panel of the controlling modem will affect the controlled modem and not the controlling modem When you are remotely controlling another modem the LCD will not change as quickly as it normally does NOTE While a Modem 34336 is being remotely controlled by another Modem 34336 or is remotely controlling another Modem 34336 its diagnostic port cannot be used for other purposes commands
120. ns The modifiers are explained below Dial Command Modifiers L Links a phone number to another number to be dialed as an alternate P Sets pulse dialing mode S m Dial number stored at memory location m T Sets tone dialing mode W or colon Wait for dial tone before proceeding Pause for 2 seconds semicolon Return to command state after dialing Wait for silence exclamation Flash With few exceptions dial command modifiers function only if they are used in a command line with the D command or if they are included in a stored number A carriage return or period must be used at the end of a dial string An example of a command line with two dial modifiers is shown below AT DT 9 555 1212 The modifier T instructs the modem to tone dial The comma instructs the modem to pause after dialing 9 before it dials the remaining digits Missing Parameter A missing parameter is interpreted as a zero For example the E command echo can be sent as either EO or El but if an E alone is sent the Modem interprets it as if an EO was sent Command Buffer The command buffer holds a maximum of 40 characters If the command line exceeds 40 characters the modem refuses to execute any portion of the command line and sends an error message The AT at the beginning of the command line control characters and spaces do not take up space in the command buffer Punctuation except f
121. ntered alone followed by a carriage return AT P in which case all subsequent telephone numbers are pulse dialed If the dial command does not specify which dialing mode to use the modem defaults to the last mode specified S Modify S Register This command is used to write information to a specified S register The syntax is Sr n where r is the number of the register to be modified and n is the value to be written to it for example AT S7 30 This command would change the value of register S7 to 30 If you enter just 5 the auto dialer changes the value of the last register used to 5 More information on S registers is included in Section 5 3 S Read S Register This command instructs the autodialer to read the contents of the specified S register The syntax is Sr where r specifies the register to be read For example S7 reads the value of register S7 The value is displayed on the computer or terminal monitor If you enter by itself the autodialer displays the value of the last register used if is entered by itself the autodialer displays the number of the last register used e g 52 For information on how to interpret S register values see Table 5 3 T Tone Dialing This command causes a telephone number in the dial command string to be dialed using tone signals See the P command above for additional information W Wait For Dial Tone The W command or colon is used in a dial string to instruct t
122. nts may require control of a remote CD signal by a local Request to Send RTS signal V 13 operation allows local RTS control of a remote CD signal without actual ON OFF switching of the modem carrier The following paragraph explains how the Modem responds to RTS signals when it is configured for V 13 operation When RTS is raised HIGH by the terminal the V 13 ON PATTERN is sent The Modem then raises CTS and data can be sent When RTS is brought LOW the V 13 IDLE PATTERN is sent and the Modem drops CTS If V 13 TX is enabled but the Modem s data pump is not ready to send i e if it is training or retraining raising RTS causes CTS to be raised but the V 13 ON PATTERN is not sent When V 13 RX is enabled CD turns ON if the V 13 ON PATTERN is detected CD turns OFF if the V 13 IDLE PATTERN is detected or if the Modem retrains loses carrier or is reset MAIN MENU lt 3 gt RESET RATE 5 0 Hayes Emulation Mode For easy reference the following tables appear consecutively at the end of this chapter e Table 5 1 Hayes Compatible Commands e Table 5 2 Hayes Mode Result Codes e Table 5 3 S Register Functions 5 1 Hayes Mode Autodialer When the Hayes emulation mode is enabled the Modem emulates a Hayes autodialer and functions like a Hayes modem Commands are issued from the computer keyboard or other DTE and the Modem is compatible with software written to drive a Hayes style command set 5 1 1 ENABL
123. o the MAIN MENU To return to the status screen press ENT three times Modem 34336 Autodialing the Stored Number To autodial the stored number from the EIA status screen press the following pushbuttons in sequence ENT Pushbutton 3 to select DIAL from MAIN MENU screen 1 Pushbutton 1 to select DIAL from the AUTO DIAL screen When the local modem successfully establishes a connection with the remote unit the EIA status screen should be present This screen looks like the one shown below D TR MR RS CS TI 9600 CD RI If the modem s LCD displays an AUTO DIAL FAILURE message refer to Table 2 2 Terminating a Data Call Normal termination of a data call is processed through communication software An alternate method is switching the HANGUP option on the AUTO DIAL screen Another method is to drop the DTR signal from the DTE by software control or by turning the DTE off For manual originate answer operation see Chapter 4 2 4 4 LEASED LINE 2 OR 4 WIRE MODE QUICK SETUPS 6 7 8 AND 9 This section does not apply to V 33 leased line operation For V 33 leased line operation see the next section Table 2 2 Auto Dial Failure Messages FAILURE MESSAGE EXPLANATION LINE OCCUPIED The data line is already in use DIAL NOT ALLOWED Modem is not configured for dial backup NO DTR DTR is not present NO LINE CURR Loss of line current 2 0 Quick Start The following inf
124. occurs either automatically or by operator intervention the following message flashes on the front panel LCD of both modems ATTENTION DIAL BACKUP The message clears when the modem returns to the leased line If you want to clear the message while the Modem is still in dial backup mode press the ENT pushbutton 4 3 2 EXIT FROM LEASED LINE AUTO RECOVERY If the Leased Line Auto Recovery Return option is enabled see below the Modem automatically exits the Auto Recovery mode when leased line conditions are satisfactory Any normal disconnects such as loss of carrier or line current may also disconnect the dial connections and return communication to the leased line To ensure the proper disconnect capabilities for Leased Line Auto Recovery mode both the line current disconnect CURRENT DISC T screen and carrier disconnect CARRIER DISC T options must be enabled on both modems To manually exit the Leased Line Auto Recovery mode and return to leased line operation select DIAL from MAIN MENU screen 1 and then select HANGUP from the AUTO DIAL screen 4 3 3 LEASED LINE AUTO RECOVERY OPTIONS Three options allow you to specify the criteria the Modem uses in determining when to enter and exit the Leased Line Auto Recovery mode Leased Line Auto Recovery Select Select e Return From Leased Line Auto Recovery retn e Test Interval Test The Leased Line Auto Recovery Select option determines the type of Leased Lin
125. ols From page 2 of the LCD MAIN MENU select TEST Go to the second page of the LOCAL TEST menu Select DLB 7 0 Diagnostics RECEIVER TRANSMITTER DATA TERMINAL EQUIPMENT REMOTE MODEM DTE AT LOCAL SITE Figure 7 5 Digital Loopback Test DLB The DIGITAL LOOPBACK screen is displayed with ON and OFF as the possible selections Select ON to activate the test The status screen is displayed while the test is being conducted Ensure that test data is being generated and watch for data errors By transmitting test data and comparing it with the received copy the DTE is checked for proper operation To end the test press the ENT pushbutton to return to the DIGITAL LOOPBACK screen Then select OFF Modem 34336 7 8 Remote Modem Diagnostics The Modem performs two tests on compatible remote modems remote digital loopback RDL and remote digital loopback self test RDLST Ifa problem is encountered and the local Modem passes all diagnostic tests the local Modem can test the remote modem Two noncontiguous REMOTE TEST screens are on the Modem s LCD The remote tests are initiated from the REMOTE TEST menu Select RMT from MAIN MENU screen 2 Select TEST Then select the test type A remote test cannot be initiated unless the Remote Test option is enabled on the remote modem This option also REMOTE TEST on the LCD is accessed via SETUP screen 4 7 8 1 REMOTE DIGITAL LOOPBACK RDL The RDL test
126. on your screen Depending on the parameter used with the X command the speed is indicated by the CONNECT response code When a call is originated in Hayes mode the AT attention code causes the Modem to autobaud and override any front panel Speed Limit or DTE Speed settings The speed at which the Modem autobauds defines the speed limit for subsequent connections If the unit is not autobauded the default interface rate is 38 400 bps 5 2 Hayes Compatible Commands All Hayes compatible commands that are used with the Modem are listed in Table 5 1 near the end of the chapter More detailed information is provided below for selected Hayes commands particularly those used to answer and originate calls and other commonly used commands For Hayes commands that control modem options additional information on options may be found in Chapter 3 Commands are listed in alphabetical order in this section and in Table 5 1 5 0 Hayes Emulation Mode For most commands there are parameters numerical values used with the command specifying the function of the command For example the command L controls the modem s speaker volume L2 sets the volume to medium The default value is a predetermined value which is in effect the first time the Modem is powered up or when a reset command is given The possible parameters and default value for each command are shown in Table 5 1 A Quick Answer The A command immediately puts the modem into t
127. ontrol mode Exiting from Remote Control Mode To exit from the address or slot control mode press the ENT button five times in succession If the remote modem resets as a result of a configuration change the local modem will appear to have no control To remedy this situation press the ENT button five times Modem 34336 Modems in rack equpped with rack controller This modem with LCD pushbuttons can control any d of the shaded gray modems Standalone modems Modems in rack with or without rack controller Figure 4 1 Remote control address control mode 4 0 General Operation and Special Features 4 9 Diagnostic Interface Control The diagnostic software built into the Modem supports a special set of commands known as diagnostic port commands The commands listed in Table 4 3 are used to configure modems from either a local or remote location or to monitor modems for diagnostic purposes The diagnostic port commands are entered from a computer or terminal keyboard NOTE To configure or otherwise control a remote modem the data rate must be 9600 bps or higher 4 9 1 DIAGNOSTIC PORT The Modem s diagnostic port is an 8 pin RJ 45 connector allowing you to test or configure the Modem from a connected computer or other DTE The location of the diagnostic connector next to the power connector on the modem s rear panel is shown in Figure 2 1 The diagnostic connector requires a cable with an RJ
128. ontrol the timing of the data transmitted This timing mode is used if the modem s transmit timing must be controlled by a remote source EXTERNAL The timing of the modem and data terminal transmitting circuits is provided by an external clock within the data terminal and is provided to the modem via the DTE connector pin 24 This mode of clocking is used if the DTE must be in control of the modem s transmit timing The T1 Timer option is available for Hayes V 25 bis and Dumb modes It determines how long the Modem attempts to handshake with a calling V 32 modem before falling back to a lower speed The available T1 Timer settings are 0 0 3 0 8 1 6 and 3 0 seconds Modem 34336 Normally as part of the V 32 handshake the calling modem begins sending a sequence to the answer modem while the answer modem is still sending answer tone In this case there is no 1 timer However the V 32 recommendation allows for a time of up to 3 seconds meaning that the answer modem may be set to wait before falling back for up to 3 seconds The B option is available for all modes If the Modem makes a connection at one of the V 32 rates 4800 to 14 400 bps or V 22 bis rate 2400 bps it can request that the remote modem send a retrain sequence ENABLE The modem requests a retrain sequence e DISABLE The modem will not request a retrain sequence The Answer Originate Default option is available for Hayes and Leased modes
129. oopback test self test Initiates a local analog loopback self test View Active Configuration etc Displays modem configuration user profiles and phone numbers stored in memory cells 0 5 Displays all stored phone numbers contents of memory cells 0 9 Write Profile To Memory Saves storable configuration parameters as user profile 0 Saves storable configuration parameters as user profile 1 Transmitter Clocking Selects internal clocking Selects external clocking Selects receive mode slaved clocking Default User Profile Stored user profile O will be recalled on powerup Stored user profile 1 will be recalled on powerup Default settings where applicable are in bold face f user profile 1 is active options are controlled for Hayes mode operation by given commands or Summary Setup Do not change via front panel except via Summary Setup Modem 34336 Table 5 1 continued Hayes Compatible Commands COMMAND FUNCTION EXPLANATION amp Z Store Telephone Number Parameters are 0 9 available memory locations B Buffer Mode Speed Conversion BO Disables speed conversion B1 Enables speed conversion lt B10 gt MNP Class Limit C1 Limits operation to MNP class 1 2 Limits operation to MNP classes 1 2 Limits operation to MNP classes 1 through 3 4 Limits operation to MNP classes 1 through 4 Limits operation to MNP classes 1 through 5 Dialing Mes
130. op line and a long string of numbers on the bottom line The numbers are broken down into groups that represent a category of options for example EIA interface options Each digit position represents an option and the number in each digit position indicates the current option setting parameter The diagrams in this appendix show the following information e Which options are included in each option group Which option is indicated by each digit position within the group The possible parameters for each option NOTE The number in each digit position is the current iption setting parameter The diagrams of this Appendix show the factory default setting for each option Modem 34336 MAIN MENU lt 1 gt TALK QU The four digit hexa decimal value in the upper right corner of the SUMMARY menu UMMARY 6091 screen is checksum PN 3 derived from the ETUPS AT S RI Modem s current con figuration The check sum will change when any of the Modem s options are changed addr 11214E0 999 99 The SETUPS screen allows you to change all Modem options including those that can be accessed through the front panel The S REG screen allows you to change the S register values Do not change an S register value if you LCD and those that do not know its dedic The AT PROFILES screen a Summary Setup a OW
131. or 2 Wire Dial V 25 bis Selecting any of the three V 25 bis Quick Setups via QUICK on SETUP screen 1 enables the V 25 bis autodialer and causes all modem options to be automatically set to a preset configuration Each V 25 bis Quick Setup is suitable for a typical V 25 bis application depending on the DTE to be used To select a 2 Wire Dial V 25 bis Quick Setup access QUICK SETUP screen 2 3 or 4 for asynchronous synchronous character oriented or synchro nous bit oriented operation on the LCD and then press push button 2 After selecting the desired V 25 bis Quick Setup configuration you can reset individual options to suit your application see Chapter 2 In accordance with the CCITT V 25 bis recommendation the Modem V 25 bis asynchronous Quick Setup sets the character length to 10 bits including 1 even parity bit Both V 25 bis synchronous Quick Setups set the modem for odd parity For synchronous operation the character length option setting has no effect DIALER MODE DIAL V25Bis SCREEN If you enable the V 25 bis autodialer using the Dialer Mode option no other options are changed Select DIALER from SETUP screen 2 Then press the right arrow pushbutton to go to the DIAL V25 bis screen screen 2 Select the V 25 bis data protocol appropriate for the DTE to be used asynchronous Asyn synchronous character oriented Syn_c or synchronous bit oriented Syn_b Modem 34336 DTR DIALING IN V 25 BIS MODE
132. or a disconnect Modem 34336 3 3 5 TEST OPTIONS The Test Options affect certain tests as explained below but do not activate tests The DSR During Analog Loopback is available for all modes When ON is selected the Data Set Ready signal is forced on when the modem is in the analog loopback test mode In general this option should be left ON the default selection The Remote Test option is available for all modes The Remote Test option allows you to prevent tests from being initiated on the local Modem from a remote modem If DISABLE is selected from the Remote Test screen the local Modem ignores test initiation signals from a remote modem If ENABLE is selected tests can be initiated from a remote modem Note that there are two REMOTE TEST screens One is for the option just described the other is used for selecting either the remote digital loopback tests or remote front panel control The Remote Test option screen for preventing or allowing remote testing looks like the one shown below REMOTE ENABLE 3 3 6 EIA OPTIONS The seven options described below allow control over specific EIA interface signals The CTS to EIA options are available for all modes Regardless of the setting selected for this option Clear to Send CTS is off during flow control which occurs if error correction and flow control or buffer mode are enabled NORMAL The Clear to Send signal is on while the modem
133. or in 1000 bits or lower the Modem connects at the highest available rate If the error rate exceeds this threshold the Modem connects at the fallback rate Fallback may also occur during retrain sequences To configure the modem for automatic V 32 Speed Fallback refer to Appendix C Follow the instructions to change the value identified in the DATA PUMP OPTIONS diagram Appendix C as the V 32 Speed Fallback parameter from 1 default setting to 0 Rate Renegotiation Procedure RRP Rate Renegotiation Procedure RRP is a third type of automatic fallback it can be controlled by the user Like V 32 Speed Fallback RRP allows the Modem to automatically select the highest possible data rate depending on the signal quality Unlike Speed Fallback RRP allows for data rate fallback or fallforward at any time during data trans mission Retraining is not required RRP may be used with either dial up lines or leased line operation 4 0 General Operation and Special Features If Rate Renegotiation Procedure RRP is enabled the modem will automatically fall back or fall forward to a lower or higher data rate in response to changes in signal quality This may happen at any time during data transmission and it is done without a retraining procedure Your data transmission is virtually uninterrupted Note that data rate adjustments are limited to the range of 4800 to 14 400 bps for the Modem 4800 to 9600 bps for the Modem 3242 S e
134. or spaces does take up space in the command buffer Modem 34336 5 1 3 RESULT CODES Result codes see Table 5 2 are messages sent by the modem to the DTE monitor in response to your commands Result code options are selected using the V and X commands as explained below Result codes may be words V1 command or digits VO Word codes are preceded and followed by a carriage return line feed sequence Digit codes are followed by a carriage return The result codes and their meanings are summarized below Result codes 0 4 comprise the basic result code set OK CONNECT RING NO CARRIER and ERROR Codes 5 43 provide additional response information as explained in Table 5 2 Various combinations of these codes can be enabled or disabled by using the X command and its four parameters 5 1 4 TRANSMISSION SPEED Transmission speed is governed by the speed of the system with which you wish to communicate You must set the transmission speed of your computer by setting a switch in the hardware or by issuing a software command Refer to your computer documentation When the Modem originates a call it automatically detects and adjusts to the transmission speed set when the communication port was initialized When answering a call the Modem determines the transmission speed from the carrier signal of the originating modem Change the setting of your equipment to match that of the remote system Other wise unintelligible data appears
135. ormation applies to both 2 wire and 4 wire leased line operation The modem must be configured for the correct line type 2 wire or 4 wire If you select the correct Leased Line Quick Setup the line type is automatically set to the correct setting One modem must be set to originate mode and the other to answer mode If you select the correct Leased Line Quick Setup the answer originate status is automatically set to the correct setting Leased line operation is restricted to data rates of 4800 bps or higher e Lines can be conditioned or unconditioned After the appropriate Leased Line Quick Setup is selected the answer unit immediately begins the training sequence It is ready to handshake with the originate modem When the local modem establishes a connection with the remote unit the EIA status screen should be present This screen should look like the one shown below TR MR RS CS TI 9600 Modem 34336 2 4 5 V 33 LEASED LINE OPERATION QUICK SETUP 10 V 33 operation is available on the Modem at speeds of 12 000 and 14 400 bps V 33 leased line operation provides compatibility with V 33 modems synchronous operation only A 4wire line must be used conditioned or unconditioned and both connected modems must be set for V 33 operation After the V 33 Leased Line Quick Setup is selected the answer unit immediately begins the training sequence meaning it is ready to handshake with the originate
136. orward to a lower or higher data rate during data transmission in response to changes in signal quality Selecting V 32 bis mode makes RRP available as an option however RRP will not function unless it is enabled the default setting is enabled When V 32 bis mode is selected a RATE screen is available from MAIN MENU screen 3 The RATE screen can be used to manually initiate RRP for diagnostic purposes For additional informa tion see Section 7 6 Diagnostic Monitoring Status Screens When V 32 bis mode is selected 7200 bps can be selected as the maximum or minimum data rate using the Speed Limit option When V 32 bis is not selected 7200 bps operation is not available NOTE By definition V 32 bis operation includes the ability to operate at 12 000 and 14 400 bps Therefore only the Modem is a true V 32 bis modem However when the V 32 bis mode is selected on the Modem 32192 it will support the following options as well RRP 7200 bps data rate the RATE screen The V 32 extended mode disables the V 32 bis features In V 32 extended mode the Modem s functional ability is identical to that of previous models of this modem series the MD833A model prior to incorporation of the CCITT V 32 bis recommendation 3 0 Modem Setup Options The 208 Phase Detection option is for 208 mode Normal Conditions the modem s 208 receiver for normal modulation detection Compensated Conditions the 208 receiver for compensa
137. pecifications Available Configurations Compatibility Data Rates Data Format Operation Fallback Supported DTE Speeds Modes Stand alone or rack mount V 29 9600 7200 4800 V 32 terbo 19 2 or 16 8 kbps V 33 14 4 or 12 0 kbps V 32 bis 14 4 12 0 9 6 7 2 or 4 8 kbps V 32 9 6 or 4 8 Kbps V 34 33 6 31 2 28 8 26 4 24 21 6 19 2 16 8 14 4 and 12 kbps 9600 7200 4800 and 2400 bps V 34 28 8 26 4 24 21 6 19 2 16 8 14 4 and 12 Kbps 9600 7200 4800 and 2400 bps V 22 bis 2 4 kbps V 21 300 bps Bell 208A B 4 8 kbps Bell 2124 1 2 kbps Bell 103 0 to 300 bps Asynchronous 300 to 19 200 bps Synchronous 600 to 19 200 bps Asynchronous 9 10 or 11 bits serial binary Synchronous Serial binary Full duplex over dialup or leased line Simulated half duplex V 13 operation Data Rates 16 8 14 4 12 0 9 6 7 2 4 8 2 4 1 2 or 0 3 kbps Operation V 22 bis V 22 V 21 or V 23 300 to 115 200 bps 34 33 6 31 2 28 8 26 4 24 21 6 19 2 16 8 14 4 and 12 kbps 9600 7200 4800 2400 bps full duplex over 2 wire line Trellis coded V 34 QAM at 28 8 26 4 24 21 6 19 2 16 8 14 4 and 12 kbps 9600 7200 4800 and 2400 bps full duplex over 2 wire line Trellis coded V 34 Extended AT 33 6 Kbps TR 301 proposed V 32 terbo QAM at 19 2 and 16 8 Kbps V 32bis fallback at 14 4 Kbps and lower V 33 OAM Trellis coded at 14 4 and 12 0 Kbps V
138. received data Because more transmission errors occur at higher speeds on marginal transmission facilities begin testing at the highest available speed If errors occur reduce the speed and try again If you cannot correct the problem contact your supplier 7 0 Diagnostics 7 5 How to Select and Activate Tests 7 5 1 FRONT PANEL CONTROL Tests are accessed and activated in the same way options are selected by using the LCD and front panel pushbuttons as explained in Chapter 3 To find the LCD screen for a specific test refer to the LCD flow chart Diagnostic And Control Functions at the end of this manual Once you access the screen for a specific test press pushbutton 1 to begin the test select ON A test status screen is automatically displayed To deactivate a test press the ENT pushbutton and then pushbutton 3 The ENT button cannot be used to exit the text screen until the test is deactivated NOTE For valid test results error correction must be disabled before diagnostic tests are run To disable error correction set the V 42 Mode option to OFF 7 5 2 RUNNING TESTS IN HAYES MODE In Hayes emulation mode only most of the diagnostic tests available on the Modem can be activated via the DTE keyboard using the amp T commands listed in Chapter 5 To set the duration of a test assign a value to register S18 For example AT 18 30 sets the test time to 30 seconds The command amp TO terminates a test For further i
139. red for two types of security operation security callback or password pass through operation Both types of security operation provide security on incoming calls by requiring remote users to enter a valid password In addition access to Hayes compatible commands for viewing and storing phone numbers is password protected If callback operation is enabled the Modem calls back an authorized user after he or she enters a valid password If pass through operation is enabled the Modem passes a connection on to the DTE interface only after it receives a valid password The password protection scheme used by the Modem for incoming calls is summarized below e A remote modem calls the local Modem Local Modem answers Remote user sends carriage return CR Local Modem sends PASSWORD query displayed on remote terminal Remote user sends unique password assigned to remote modem Local Modem confirms password and according to the password grants access if programmed for pass through operation or initiates security callback 4 0 General Operation and Special Features The modem s security configuration for password protection is controlled from the DTE by a special set of password commands The commands are implemented by using the Hayes AT amp Z command to store them in memory If an administrative password is implemented the AT amp Z command will not function until it is unlocked The Modem incorporates 10 memory
140. ronous synchronous full duplex For most applications the automatic adaptive equalizer setting provides all the equalization necessary to compensate for line impairments meaning that equalizer adjustments are generally not necessary However in the event that equalizer adjustment is needed any of four types of compromise equalization can be selected Type I T I on the LCD Type II T II Type III and Type IV T IV The equalizer can also be turned OFF Where line conditions are atypical it may be necessary to adjust the equalizers to optimize the signal quality If adjustment is necessary refer to the quality screen for guidance this screen shows a relative indication of the signal quality in both numeric and graphic form The Trellis Code option is available for all modes Trellis coding provides performance advantages for all modulation patterns The modem s CCITT compliant trellis coder is normally enabled at speeds of 9600 bps and above but may be negotiated off by a modem that is not equipped with a trellis coder The trellis code option allows you to enable or disable the trellis coder The Transmitter Clocking option is available for all modes It selects one of three possible sources for the transmitter timing signal INTERNAL The timing of the modem and data terminal transmitting circuits is provided by an internal clock within the modem RECEIVED RX CLK The timing of the received data is used to c
141. rt If the menu has more than one screen each screen is numbered This number appears in the upper right corner of the LCD display If there is no page number the menu has only one screen Additional pages of a menu show additional option selections In the example below the screen number or page number is 2 2 Numbered Pushbuttons Pushbuttons 1 2 and 3 correspond to segments 1 2 and 3 of the LCD screen These segments left middle and right positions of the LCD screen are numbered on the modems front panel With respect to how the LCD flow chart is organized pushbuttons 1 2 and 3 either take you to a lower level or allow you to select an option when there is no route to a lower level 3 ENT Pushbutton To exit from a displayed screen press the ENT pushbutton With respect to how the LCD flow chart is set up pushing ENT moves you upward through the chart toward the MAIN MENU Pressing ENT repeatedly will return you to screen 1 of the MAIN MENU Pressing ENT repeatedly after arriving at the MAIN MENU screen causes the LCD to alternate between the status screen and the MAIN MENU In the case of most tests ENT cannot be used to exit the test screen once the test is activated To exit a test first press ENT and then select OFF to end the test 3 0 Modem Setup Options NOTE If you have selected a Quick Setup or have changed certain options settings pressing the ENT pushbutton to e
142. s eese 11 2 2 PowerOmScreen csm EEEE 11 2 2 2 ETA Status SCEeelk A 12 2 9 Quick Setup taa 13 2 4 Basic OperatiOL CHER Re e RNC 16 2 4 1 2 Wire Dial Hayes Mode nter ntes 16 9 4 2 2Wire Dial V 25 bis 18 2 4 5 2 Wire Dial Dumb Mode 1 eee 19 2 4 4 Leased Line 2 or 4 Wire Mode s 21 2 4 5 V 33 Leased Line Operation 1 n 22 2 4 0 2 Wire Dial Bell 208 Operation 22 2 4 7 4Wire Leased Line V 29 Mode sse 23 2 4 8 29 Fast Master and Slave Modes esses 24 2 5 Proble Solving neret iot 25 3 0 Modem Setup Options 7 eee 27 3 1 Methods For Selecting Options ss 27 3 2 Selecting Options From The Front Panel 28 3 2 1 Pushbuttons And The 1 28 3 2 2 How To Select Options sss 29 AS 32 Table of Contents 3 3 1 V 42 Error Correction Options see 35 302 Dialer Mode e ioni eei eni deter onm 41 3 9 9 Data Format Options 42 3 3 4 Disconnect OptOnS associe distinciones 43 3 3 5 Test OptUORS sanies geisotisoiimedipiniiisi iier eset eril 44 3 3 6 Options cinc eter
143. s mode If an option is changed using an AT command the change is effective for Hayes mode only unless option changes are saved to memory If you change an option using an AT command and then switch to a different mode without saving the change the front panel display LCD remains unaffected The effect of option changes made using the Summary Setup feature depends on which user profile 0 or 1 is active See Section 5 4 1 5 4 1 SAVING OPTION SELECTIONS Changes made to option settings cease to be effective if power is removed from the Modem or if a factory reset occurs unless the Modem s configuration is saved to nonvolatile memory The storable parameters of the Modem s configuration can be saved to user profile 0 or 1 using the amp W command amp W0 or amp W1 Upon powerup the Modem recalls either profile 0 or profile 1 depending on which is designated as the default profile The amp Y command is used to designate the default profile The Modem is shipped from the factory with profile 0 as the default profile As explained in the following sections the Modem is programmed to treat profile 0 and profile 1 differently It is recommended that you use profile 0 for your standard configuration and make it the default profile amp Y0 Profile 1 is intended for storing an alternate configuration if you need one e g an alternate application To view the contents of the user profiles use the amp V WS commands
144. s mode only is to use the Hayes AT amp Z command to store the phone number to be redialed and the R command in memory location 0 by entering the following command AT amp Z0 T555 4545 R Dial Line Auto Recovery is not enabled until you select DIAL from the front panel AUTO DIAL screen If power is removed from the modem select DIAL to re enable Dial Line Auto Recovery To disable Dial Line Auto Recovery select RESET from MAIN MENU screen 3 4 4 2 RECOVERY PROCEDURE If Dial Line Auto Recovery is enabled and the Modem goes on hook it redials the stored phone number up to 10 times It redials 5 times at 30 second intervals waits 2 hours and then redials 5 additional times at 30 second intervals The Modem stops redialing after 10 attempts If a connection is broken re established and broken again the full sequence of 10 redial attempts does not occur unless the Modem is on line for more than 1 hour The modem redials but it is programmed not to exceed more than 10 redial attempts in 1 hour 4 5 DTR Dialing NOTE To use DTR dialing in V 25 bis mode you must use the Summary Setup feature explained in Chapter 6 Modem 34336 4 5 1 DIALING A STORED NUMBER DTR dialing allows you to set up the Modem to automatically dial a stored number even when the autodialer is not enabled To enable DTR dialing select DTR from the DIALER option screen When DTR dialing is enabled an OFF to ON transition of D TR causes the Modem to
145. sage Disables DIALING message Enables DIALING message MNP Flyback Buffer Enables flyback buffer Disables flyback buffer V 42 Break Handling Selects normal break handling Selects destructive expedited break handling Selects non destructive expedited break handling Selects non destructive non expedited break handling V 42 bis Operation Enables V 42 bis operation error correction with data compression Disables V 42 bis operation Option can be changed only when Modem is off line Default settings where applicable are in bold face If user profile 1 is active options are controlled for Hayes mode operation by given commands or Summary Setup Do not change via front panel except via Summary Setup 5 0 Hayes Emulation Mode Table 5 1 continued Hayes Compatible Commands COMMAND FUNCTION EXPLANATION V 42 Mode Disables error correction Enables mandatory mode for error correction Disables error correction Enables automatic mode for error correction V 42 Protocol Selects LAPM protocol only Selects MNP protocol only Selects LAPM MNP protocol MNP as alternate V 42 Flow Control Two parameters may be used e g Q0 1 Q3 2 etc First parameter specifies DCE DTE flow second optional specifies DTE DCE flow control None no flow control CTS on off or RTS on off CTS for DCE DTE flow control RTS for DTE DCE DC1 DC2 flow control DC1 DC3
146. screen the Modem will fall back to the next lower speed If you select UP the modem will fall forward to the next higher speed if the signal quality is good enough Remember the data speed range within which the Modem can fall forward or fall back is limited by the minimum and maximum rates set via the Speed Limit option Modem 34336 After you select UP or DOWN the LCD will automatically switch to the EIA status screen so you can see the result of the rate change request i e the current data rate which is displayed in the lower left corner of the EIA status screen However if the Modem has reached the minimum or maximum speed it will not switch to the EIA status screen NOTE A request to increase the data rate may result in no change in the data rate if the signal quality is poor If you manually initiate speed renegotiation with RRP enabled the modem will automatically renegotiate the speed again after four seconds If the originate modem attempts to negotiate a rate that is lower than the minimum rate setting of the answer modem the answer modem will disconnect GSTN cleardown 4 11 V 13 Operation The Modem can be configured for CCITT V 13 operation which emulates half duplex operation for either point to point or multidrop applications The correct options for these applications are identified in Chapter 2 The Modem normally operates in full duplex however some applications such as certain network environme
147. sing the selected protocol LAPM MNP LAPM ONLY or MNP ONLY the action the Modem takes depends on the V 42 mode setting V 42 bis Operation is available for Hayes V 25 bis Dumb and Leased Line modes except V 33 V 42 bis operation provides error correction with data compression Like V 42 error correction V 42 bis uses the link access protocol LAPM V 42 bis operation may be enabled or disabled The Break Handling option is available for Hayes V 25 bis Async only Dumb Leased line modes except V 33 When error correction is active a break signal is relayed with an attention packet The break handling option determines how the attention packet is sent NONE No attention packet is sent DESTRUCTIVE EXPEDITED DESTR EXP All data in the buffer is deleted the attention packet is then passed through the channel NON DESTRUCTIVE EXPEDITED NDT EXP The attention packet is passed through immediately but data in the buffer is not deleted NON DESTRUCTIVE NON EXPEDITED NDT NEXP The attention packet is passed through the channel in sequence and any data is buffered this preserves the sequence of data and breaks received Modem 34336 The Buffer Mode Speed Conversion option Hayes V 25 bis Dumb Leased line modes except V 33 It enables or disables speed conversion for asynchronous operation only between the DTE and modem when error correction is not used ENABLE When error correction
148. ted modulation detection for improved performance with older 208 modems The Answer Tone Detection is for 208 mode Enable Conditions the originating modem s receiver to wait for answer tone detection before going on line Disable Conditions the originating modem to go on line without requiring answer tone detection This setting accommodates operation with automatic calling units that connect the modem to the line at the end of answer tone The Multimode Handshake option is for Hayes V 25 bis and Dumb modes This option determines how long the Modem will attempt to handshake with a V 32 modem before falling back to a lower speed Timer If the timer setting is selected the modem will attempt to handshake with a calling V 32 modem for the time specified by the 1 Timer option e V 32 bis ANNEX A If the V 32 bis Annex A setting is selected the modem will handshake according to the conventions established in Annex A of the CCITT V 32 bis recommendation Handshaking using the Annex A selection will generally be faster than handshaking based on the timer NOTE The T1 Timer option Section 3 3 7 Modem Setups is only effective if the Multimode Handshake option is set to 0 T1 timer Two additional options Operating Mode Fallback and V 32 Speed Fallback are discussed in Section 4 9 Modem 34336 4 0 General Operation and Special Features This chapter describes the following Modem
149. ters The Modem includes 28 registers 50 527 that are used to control specific modem operations in Hayes mode only Each register holds a value serving as a specific operating instruction for the modem Several of the S registers affect how the previously described commands are executed The functions of the registers intended for user access are explained below and summarized in Table 5 3 5 0 Hayes Emulation Mode 5 3 1 READING AND SETTING REGISTERS Use the S command to read the value of a register or to change its value To read the current value of a register use the command S where the number of the register is specified between the S and the for example S9 The decimal value of the register contents is displayed You may read multiple registers For example if you wish to read the current value in registers SO and S7 enter the following command AT S0 S7 A typical response might be 001 030 OK meaning the values stored in registers S0 and S7 are 1 and 30 respectively To set or change a parameter use the command Sz where the number of the register follows S and a value between 0 and 255 the range of values that can be assigned to the registers follows the equal sign AT S0 5 The above command changes the value stored in SO to 5 The S command can also be used without or to point to a register that will be read from or written to without being specified To illustrate this if you enter the following
150. test In Hayes mode only initate the RDLST using the command amp T7 AT amp 7 In any mode initate the RDLST test from the front panel Both modems must be on line From the second page of the MAIN MENU select RMT Then select TEST From the REMOTE TEST menu select RDLST From the RDL SELFTEST screen select ON to activate the test The status screen is displayed as the test is being conducted If ER is present on the status screen the modem is detecting errors If numerous errors are detected take steps to try to identify their source Modem 34336 TRANSMITTER RECEIVER PATTERN GENERATOR A PATTERN DETECTOR TRANSMITTER RECEIVER m a LOCAL MODEM Figure 7 7 Remote Digital Loopback Self Test APPENDIX A DB25 Pin Assignments Appendix A DB25 Pin Assignments cr nation Indicator MEN E BB Recevedata RD RD Modem Testing vorago oem DB Transmit Ciock TO Modem DD Receive Clock RC Modem Analog loopback ALB control DTE Remote digital loopback RDL control DTE arona R 23 CH Speed Select cmon m oa eternam J 1 voltage activates indicated loopback test only if ALB DTE controled or RDL DTE controled option is enabled voltage disables test 2 voltage 14 400 bps voltage 2400 bps 3 Alternatively pin 25 may be used for analog loopback ALB control S
151. they do not have LCDs and pushbuttons The controlling Modem 34336 can control another Modem 34336 Control Procedure Using a Rack Controller Enabling Remote Control through a Rack Controller The main screen used to control other modems through a rack controller is REMOTE screen 2 shown below REMOTE lt 2 gt CONTROL ADDR C ADDR This screen is used as follows 1 Select address control or slot control To control a modem in the same rack as the controlling modem or to control a connected remote modem you must first specify the address or slot number location in the rack of the modem you want to control If you want to specify the modem by its address select ADDR C address control on the bottom line of REMOTE screen 2 NOTE Each modem must have a unique address If you want to specify the modem by its slot number select SLOT C For slot 16 use 00 or 16 whichever is displayed on your modem Press pushbutton 2 to toggle between ADDR C and SLOT C slot control 4 0 General Operation and Special Features 2 Enter the address or slot number To enter the address or slot number of the modem to be controlled press pushbutton 3 If ADDR C is displayed on REMOTE screen 2 a screen showing ADDRESS 000 000 on the top line will be displayed If SLOT C is displayed on REMOTE screen 2 a screen showing SLOT NUMBER 01 on the top line will be displayed Enter the address or slot number as follows Use the right and
152. tion 5 for pass through operation AT amp Z5 PYELLOW The password is YELLOW The DTE prompts the user to enter the assigned password by displaying the PASSWORD query If the user enters the correct password YELLOW the call is connected Modem 34336 NOTE Passwords may be stored only in memory locations 2 through 9 5 Programming a response to a correct password Enter the following command replacing CONNECTED with your message AT Z0 UCONNECTED The DTE responds with the specified message when the modem receives a correct password NOTE The U command and message can be stored only in memory location 0 4 8 Modem Controlled Remote Control Certain modems can be used to remotely control other modems Alternately modems may be remotely controlled from a computer or other DTE This section explains modem controlled remote control Remote control from a DTE is explained in Section 4 9 Two types of modem controlled remote control are possible Direct modem to modem control One modem can be used to control the front panel of another modem through a phone link Control through a rack controller A modem in a rack enclosure equipped with an intelligent rack controller can control Another modem in the same rack or A remote modem connected to any modem in the rack For both types of remote control the controlling modem and the controlled remote modem must be connected at a data rate that uses trellis codi
153. to recovery return sec O off 1210 2240 3260 4 120 Auto recovery select O none 1 dial if bad 30 sec 2 dial if bad 1 min 3 dial if bad 2 min 4 dial if bad 3 min 5 dial if bad 4 min 6 manual recovery Carrier detect level leased dBm 0 26 1 33 2 43 TX level leased dBm 0 0 1 1 9 9 A 10 F 15 TX clocking O internal 1 received clocking 2 external Answer originate O answer 1 originate Modem 34336 DATA PUMP OPTIONS NOTE pump1 and pump2 are displayed to help indicate the relative positions of individual options across the LCD pumpi pump2 2002103010100011110 it These five options apply to the Modem MD833A R2 only 208 phase detection O normal 1 compensated V 32 mode 0 V 32 extended 1 V 32 bis Rate renegotiation RRP O disable 1 enable Turnaround delay O on 1 off Satellite delay O disable 1 enable RTS to CTS delay ms O none 1 15 2 50 3 150 CTS O always ON 1 follow RTS Carrier type O switched 1 constant Phase reversal in answer tone O enable 1 disable Auxiliary channel O disable 1 enable Speed fallback O disable 1 enable Trellis coding O disable 1 enable Answer tone 0 2100 Hz 1 2225 Hz Guard tone O off 1 550 Hz 2 1800 Auto retrain O disable 1 enable Signal quality level error bits 021 in 103 1 1 in 105 Compromise equalizer type O off 1 I 2 11 3 111 4 IV
154. transformer cable included to the rear panel connector labeled POWER Plug the other end into an AC outlet RX LEASED DIAL DIAL LINE PHONE Power z DTE AC outlet trans Dialup Leased Telephone former Line Line Figure 2 1 Modem 34336 Connections Modem 34336 For dialup applications Use the supplied two conductor crossover cable to connect the Modem to the telephone line modular wall jack Plug the eight pin connector RJ 45 of the cable into the rear panel jack labeled TX DIAL Then plug the six pin connector RJ 12 into the telephone jack NOTE Do not bundle the telephone and RS 232 cables together Optional For manual dial operation or if you want to use the telephone line for voice transmissions when the Modem is not operating in data mode connect a standard telephone into the rear panel jack labeled PHONE For leased line applications Use the supplied four conductor cable to connect the Modem to your leased line modular wall jack Attach the six pin modular connector RJ 12 to the rear panel jack labeled LEASED LINE Attach the eight pin connecter RJ 45 of the cable into the line s terminal block The same cable is used whether you have a 4 wire or 2 wire leased line In a 4 wire application the green and red wires are the TRANSMIT pair and the yellow and black wires are the RECEIVE pair When the cable is connected to a 2 wire line only the green and red wires are used NOTE Do not b
155. ume The SPEAKER VOLUME screen is shown right LOW MEDIUM HIGH The currently selected setting flashes Press pushbutton 2 to switch the volume setting to MEDIUM MEDIUM begins to flash indicating the new selected setting although the new selection does not become active until you exit the SETUP menu To return to the first page of the MAIN MENU press the ENT button several times SPEAKER VOLUME 3 Returning to the EIA Status Screen Once your selection is complete return to the EIA status screen Press the ENT pushbutton several times the exact amount depends on which screen you are exiting from If the modem is in a test mode press ENT and select OFF to end the test 4 Automatic Configuration Save Feature When you exit the SETUP menu the Modem automatically saves its current configuration 1 option setups including any changes you made to its internal memory The saved configuration remains in effect until it is changed even if a loss of power occurs 5 How to Return to Default Settings The factory default settings are different for each of the Quick Setup configurations available to the modem To return to the factory default settings for any of these configurations go to the QUICK SETUP menu and select the desired configuration The 2 Wire Dial Hayes Quick Setup does not recall the factory default settings it recalls the stored user profile 0 or 1 depending on which is designated as the def
156. umpers unscrew the four screws on the bottom of the modem and carefully lift off the cover WARNING Improper setting of AC and DC power jumpers could result in serious damage to the modem Appendix D Jumpers Figure D 1 Modem Circuit Board Jumper Locations Modem 34336 Table D 1 Jumper Switch Functions JUMPER S Pins 1 and 2 connected Pins 2 and 3 connected JP1 Frame and signal Frame and signal ground connected ground not connected JP2 12 24 48 VDC operation JP4 12 24 48 VDC operation Set to same position JP5 JP6 A A1 control MI MIC control Set to same position JP7 Pin 25 used for analog Pin 25 used as test loopback input mode indicator output JP8 For factory use only Do not change JP8 setting Factory settings are shown in bold face For each jumper pin 1 is identified by a 1 printed on modem circuit board The JP2 pin 1 label may be difficult to read JP2 pin 1 is the pin closest to the edge connector NOM Statement NORMAS OFICIALES MEXICANAS NOM ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD 1 Todas las instrucciones de seguridad y operaci n deber n ser le das antes de que el aparato el ctrico sea operado 2 Las instrucciones de seguridad y operaci n deber n ser guardadas para referencia futura 3 Todas las advertencias en el aparato el ctrico y en sus instrucciones de operaci n deben ser resp
157. undle the telephone and RS 232 cables together 2 1 5 JUMPERS For most applications you will not need to reset internal jumpers However jumpers must be reset for the following situations e Ifyou are connecting frame ground to signal ground e Ifyou are switching from A Al control to MI MIC control Change the function of TIA EIA pin 25 the default is test mode indicator If you use the Modem in a DC rack enclosure For detailed jumper information see Appendix D 2 0 Quick Start 2 2 Front Panel LCD and Controls To select a Quick Setup configuration you will need to use the pushbuttons and liquid crystal display LCD on the modem s front panel These features are shown in Figure 2 2 For a detailed explanation of the front panel controls see Chapter 3 2 2 1 POWER ON SCREEN When the Modem is powered on the LCD momentarily displays the power on screen The top line identifies the modem type The lower line indicates the software revision level NOTE The software revision level of your modem may be different from the number shown above The Modem spends about two seconds checking the ROM checksum and doing self tests and then displays the status screen V 34 33 6 Version 1 2 13 ENT FRONT PANEL LIQUID CRYSTAL DISPLAY LCD PUSHBUTTONS Figure 2 2 Front Panel LCD and Controls Modem 34336 2 2 2 EIA STATUS SCREEN The EIA status screen indi
158. up in the absence of carrier or line current S11 Tones This register sets the spacing of tones used for dialing The rate is slowed by increasing the value of 511 to the maximum value 255 This register has no effect on pulse dialing which is fixed at 10 pulses per second S12 Guard Time This register is effective for asynchronous operation only The escape guard time delay is required immediately before and after entering the escape code therefore the three escape code characters must be entered within the guard time delay of each other The unit for this register is 1 50 second or 20 ms meaning the default value of 50 equals 1 second 5 0 Hayes Emulation Mode If the guard time is zero timing is not a factor The three escape characters can occur with any timing relationship but they must be consecutive Be cautious when assigning small guard times You may not be able to enter three characters fast enough especially if the guard time is less than the time required to transmit one character at the current transmission rate S18 Diagnostic Timer The value in register S18 determines how long a diagnostic test runs For example if S18 is set to 120 the test activated by one of the amp T commands runs for 120 seconds If S18 is set to zero the default the test timer is disabled and the test runs indefinitely To terminate a test when the test timer is disabled use the command TO or reset the modem Reg
159. xit the SETUP menu will cause the modem to reset 3 2 2 How To SELECT OPTIONS Options are configured from the SETUP menu To access the SETUP menu press the rightarrow pushbutton at page 1 of the MAIN MENU This will take you to page 2 of the MAIN MENU Press push button 1 to select SETUP Front panel LCD The SETUP menu has six screens Use the arrow pushbuttons until the option you wish to configure is displayed on the bottom line of the LCD window Select the option you wish to configure by pressing the pushbutton that corresponds to the number on the front panel When you select an option the option flashes on the LCD The option will not take effect until you leave the SETUP menu Simply accessing an option screen does not change the option so not hesitate to move through the various LCD screens in the SETUP menu Note the following points e Selected options do not become active until you leave the SETUP menu Changing some options causes the modem to automatically reset The options you select are automatically saved by the Modem when you leave the SETUP menu 1 DEC INC Decrease Increase Screens Several option screens show the abbreviations DEC and INC on the bottom line of the LCD display The abbreviations mean the numerical value shown on the top line e g a stored phone number can be changed Selecting DEC pushbutton 1 decreases the value selecting INC pushbutton 3 increases it
160. y disabled S5 Backspace This register is effective for asynchronous operation only The value in S5 defines the backspace character Do not use values between 33 and 126 S6 Blind Dialing Wait Time The value in 56 determines how long the Modem waits after picking up the telephone line going of hook before beginning to dial If S6 is set for less than 2 seconds the modem waits 2 seconds before dialing If the X2 or X4 command is in effect dial tone detection is enabled and blind dialing is disabled meaning the value in S6 has no effect 7 Carrier Dial Tone Wait Time This register controls two wait times wait time for carrier and if W is included in the dial string wait time for dial tone or wait time for silence if is used S8 Pause Time Register S8 controls the pause time effected by a comma in a dial string or other command line 59 Carrier Detect Response Time Register 59 determines how long a carrier tone must be present for the Modem to recognize the tone and indicate a carrier detect The time required for the absence of a carrier tone to be recognized is fixed at 0 5 seconds 10 Loss Of Carrier Delay The value in register S10 determines the length of the delay from the occurrence of a loss of carrier until the Modem hangs up the telephone line A value of 255 disables the Modem s carrier disconnect option and line current disconnect option meaning the Modem will not hang
161. y disabled the D command can be used to display the LCD screen The CONNECT command also enables echo and line feed on the DTE screen whereas both are disabled when CON is used Data from the connected modem is easier to read when CONNECT is used however data throughput is faster if CON is used On the Modem s front panel LCD a selected option flashes so it is easily identified as the current selection When an LCD display is sent to the DTE in response to the CONNECT command characters flashing on the LCD are indicated on the DTE screen by asterisks An asterisk appears below each flashing character In the example below the selected CTS to EIA option is TRUE Actual LCD on connected modem CTS to ElA NORM RTS TRUE DTE display CTS to EIA NORM RTS TRUE Asterisks denoting flashing characters also displayed if D command is used to request a display of the LED provided the connect command last used was CONNECT and not CON Even when the CON command is used meaning the LCD of the connected modem is not automatically displayed a computer reading data from the diagnostic port is able to determine which characters are flashing because bit 7 MSB is set in each flashing character 4 9 5 DISCONNECTING FROM A DIAGNOSTIC LINK There are two ways to disconnect from a modem DTE diagnostic link If you want to connect to another modem issue the CONNECT command followed by the a

Black Box Modem MD885A-R3 User's Manual

Contents

Download Pdf Manuals

Related Search

Related Contents