Patton electronic 2500 Series User's Manual
Contents
1. Features V 52 and V 54 compliant tests Nine easy to read LED indicators to monitor data signals Internal external or received loopback clocking AT amp T 62310 compliant Can be used as a high speed modem for private twisted pair Available in rack card and clusterbox versions Made in the USA 2 2 GENERAL PRODUCT DESCRIPTION The Model 2500 Series CSU DSUs operate either synchronously or asynchronously over 4 wire circuits up to 64 kbps Rate conversion allows operation with a variety of DTE devices Diagnostics include V 54 and V 52 loopback tests as well as CSU loops Configuration is accomplished by either externally accessible DIP switches or RS 232 software switches user provides terminal Nine easy to read front panel LED indicators monitor data and control signals The rear panel presents both RS 232 V 24 and V 35 DTE connections The Model 2500 Series is AT amp T compliant and supports DDS Switched 56 Clear Channel 64 and other digital services available from major service providers including AT amp T Sprint and MCI Dedicated models can also be used as a high speed modem for private twisted pair The Model 2500 Series is available in standalone or in rack card configurations only standalone versions are covered in this manual 1 3 FCC INFORMATION The Model 2500 Series has been tested and registered in compliance with the specifications in Part 68 of the FCC rules A label on the equipm2. For DTE rate of 57 6 kbps set the rate adapter to Line Rate DTE Rate set line rate to 56 kbps set DTE for two stop bits and set CSU DSU character length to 11 bits DTE Loop Control Choosing option 8 in the Software Switch Menu takes you to the DTE Loop Control Menu below The local and remote loopbacks on the Model 2500 Series can be controlled from the DTE interface by raising or lowering the LL and RL signals To allow the DTE to control these loopbacks in this manner enable this option Disable if you want the Model 2500 Series to ignore these signals continued 21 22 Clock Mode Choosing option 9 in the Software Switch Menu takes you to the Clock Mode Menu below Set this option as follows Internal Master To use the Model 2500 Series internal reference clock as the timing source select item 1 Use internal timing in point to point applications where the Model 2500 Series is being used as a limited distance modem Set the far end Model 2500 Series unit for looped timing as described below Network Looped To have the Model 2500 or 2520 derive a transmit clock from the incoming data stream from the network select item 2 This is the default setting and appropriate for most applications External Terminal Timing To have the Model 2500 Series use the DTE supplied transmit clock pin 24 on and RS 232 V 24 interface or pins U and W on a V 35 interface select item 3 Use extern
3. 2500 Series is equipped with nine LED indicators that monitor the status of communication Figure 5 below shows the location of the LEDs on the Model 2500 Series front panel Note also the location of the test mode switches and RS 232 control port used in Switched 56 dialing as well as software configuration Following Figure 5 is a description of each LED s function TD and RD will glow red to indicate an Idle condition or Binary 1 data on the respective terminal interface signals Green indicates Binary 0 data CTS will glow red to indicate an Off condition Green indicates an On condition When on the unit is ready to send data If CTS remains off check the Forced RTS Circuit Assurance and Anti Stream settings CD will glow green to indicate that the a valid carrier is present Red indicates that there is no valid carrier detected DTR will glow green to indicate that the DTR signal from the terminal is active NS will glow red to indicate No Signal This means the Model 2500 Series receiver does not detect a signal from the digital service provider or in the case of short haul operation from the remote Model 2500 Series If NS is lit check for an unplugged cable broken wire or an incorrect Line Rate selection continued OS glows red to indicate Out of Service This means the Model 2500 Series has received an Out of Service signal from
4. 4800 bps 13 7 10 6 9 7 2400 bps 15 1 14 2 9 1 Model 2500 Series Distance Table miles Wire Gauge 22 24 26 35 36 APPENDIX C FACTORY REPLACEMENT PARTS AND ACCESSORIES Patton Model Description 10 2500 DDS Cable RJ48 RJ48 6 foot 10 561S Control Port Cable EIA 561 6ft shielded 12M 561 Adapter EIA 561 to DB 25 Male 12F 561 Adapter EIA 561 to DB 25 Female 082R2 Fuse 5x20mm 200mA 250V Time lag Little Fuse P N 239 200 0805US American Power Cord 0805EUR European Power Cord CEE 7 0805EURP Europlug Power Cord CEE 7 16 0805UK United Kingdom Power Cord 0805AUS Australia New Zealand Power Cord 0805DEN Denmark Power Cord 0805FR France Belgium Power Cord 0805IN India Power Cord 0805IS Israel Power Cord 0805JAP Japan Power Cord 0805SW Switzerland Power Cord APPENDIX D INTERFACE PIN ASSIGNMENT DDS INTERFACE The DDS Interface is an RJ 48S modular jack Pin Signal 1 TX 2 TX 3 no connection 4 no connection 5 no connection 6 no connection 7 RX 8 RX M 34 CONNECTOR TERMINAL INTERFACE
5. EIA 561 patch cable refer to the control port pinout diagram in Appendix D 2 Power up the terminal and set its RS 232C port as follows 9600 baud 8 data bits 1 stop bit no parity local echo CR CR LF on inbound data ANSI VT 100 emulation 3 Key menu then press RETURN The Model 2500 Series Main Menu should then display on the terminal screen see below 13 14 4 2 1 USING THE SOFTWARE MENU SYSTEM The Model 2500 Series Menu System operates as follows 1 All selections must be followed by RETURN 2 To make a selection from any menu enter the option number at the prompt and press RETURN 3 To exit any menu without making a selection press ESC followed by RETURN Note You can also exit by just pressing RETURN However doing this in the Store Phone Number Menu will clear the buffer of the currently stored number 4 2 2 VERIFYING SOFTWARE SWITCH CONTROL In order to use software switches for configuration it is necessary to disable the hardware switch settings To do this use the following procedure Note If this procedure is omitted your software configurations will be overridden by the hardware switch settings 1 On the Main Menu opposite page choose item 1 Select Hardware Software Switch Control The following screen will appear 2 In the Hardware Software Control Menu select item 2 to enable software switch control 3 The Main Menu will automatically reappear after your sel
6. RD CTS CD DTR No Signal Out of Service Error and Test Mode Diagnostics V 54 compliant local and remote loopback tests V 52 compliant 511 511E BER test TELCO CSU and DSU loops Connectors DB 25 and M 34 Power Supply 115V or 230V AC Dimensions 7 3 x 6 6 x 1 6 APPENDIX B CABLE RECOMMENDATIONS The Patton Model 2500 Series operates at frequencies of 20kHz or less and has been performance tested by Patton technicians using twisted pair cable with the following characteristics Wire Gauge Capacitance Resistance 19 AWG 83nf mi or 15 72 pf ft 0163 Ohms ft 22 AWG 83nf mi or 15 72 pf ft 0326 Ohms ft 24 AWG 83nf mi or 15 72 pf ft 05165 Ohms ft To gain optimum performance from the Model 2500 Series please keep the following guidelines in mind Always use twisted pair wire this is not an option Use twisted pair wire with a capacitance of 20pf ft or less Avoid twisted pair wire thinner than 26 AWG i e avoid higher AWG numbers than 26 Use of twisted pair with a resistance greater than the above specifications may cause a reduction in maximum distance obtainable Functionality should not be affected Many environmental factors can affect the maximum distances obtainable at a particular site Use the above data rate distance table as a general guideline only Data Rate 64 Kbps 7 1 4 9 3 4 56 Kbps 7 6 5 2 3 6 19 2 Kbps 8 7 6 2 4 5 9600 bps 10 4 7 7 5 8
7. assigned Digital Facility Interface Codes 1 4 SERVICE INFORMATION All warranty and non warranty repairs must be returned freight prepaid and insured to Patton Electronics All returns must have a Return Materials Authorization number on the outside of the shipping container This number may be obtained from Patton Electronics Technical Service at 301 975 1007 Packages received without an RMA number will not be accepted Patton Electronics technical staff is also available to answer any questions that might arise concerning the installation or use of your Model 2500 Series Technical Service hours 8AM to 5PM EST Monday through Friday 3 4 3 0 INSTALLATION This section describes connection of the Model 2500 Series to the DTE and telco line interfaces as well as AC power connection 3 1 DTE INTERFACE CONNECTION The Model 2500 Series has connectors for both V 35 and RS 232 interfaces Signals output by the Model 2500 Series will appear on both interfaces An internal jumper is used to select which interface will be used for input With the jumper in the factory default position the Model 2500 Series automatically selects which interface will be used for input If the DTR signal on the RS 232 is active then the RS 232 inputs are selected Otherwise the V 35 inputs are selected If you choose you may re configure the Model 2500 Series for fixed V 35 or fixed RS 232 operation To do this follow the steps below 1 Turn the po
8. one of three ways 1 Toggle the front panel Local Normal Remote switch DOWN to the Remote position continued 2 Activate the RL lead from the DTE Note in order to use this option the DTE Loop Control option must be enabled see Section 4 1 2 If you are not sure which pin is the RL lead please refer to the pinout diagrams in Appendix D 3 From a terminal first go to the Main Menu and select item 3 to display the Software Switch Menu Section 4 2 In the Software Switch Menu select item d to go to the Set Remote Digital Loop Menu see below To activate RDL select item 1 RDL Test Procedure Once LAL is activated the Test LED should be lit Perform a BER bit error rate test on the system using BER testers on both ends If the BER test equipment indicates a fault and the Local Analog Loopback test was successful for both Model 2500 Series units you may have a problem with the line between the CSU DSUs You should inspect the line for proper connections 5 3 3 TELCO TESTING The digital service provider s central office can perform CSU Loop and DSU Loop diagnostic testing These diagnostics allow the central office to evaluate circuit operation without making visits to a customer s premises continued Figure 7 Remote digital loop 29 30 CSU Loop The CSU Loop is activated when the central office reverses the DC sealing current that flows between the TX pair and the RX pair I
9. personnel Contact Patton Electronics Technical support at 301 975 1007 for more information Figure 1 Model 2500 Series bottom view showing location of DIP switches SW2 SW1 4 1 1 SWITCH SET SW1 The configuration switches on switch set SW1 allow you to specify Line Rate Circuit Assurance RTS Character Length Data Format and DSR Loop Status Figure 3 below summarizes SW1 switch settings including the factory defaults Following Figure 4 is a description of each switch setting Line Rate These switches control the signalling rate on the line RJ 48S port They should match the speed of your digital service SW1 1 SW1 2 SW1 3 Setting On On On 2 4 kbps On On Off 4 8 kbps On Off On 9 6 kbps On Off Off 19 2 kbps Off On On 56 kbps Off On Off 64 kbps Off Off Off Force configuration pointer to default to hardware switches See Section 4 2 continued For line rates of 56 and 64 kbps it is possible to operate the DTE interface at a lower rate To do this set these switches to 56 or 64 kbps and set the Rate Converter DTE Rate switches as required Circuit Assurance On dedicated circuits the transmitter and the CTS output can be configured to go On only when a working communication circuit is established If Circuit Assurance is used enable it on only one end of the communication link In Switched 56 mode this switch should be set to On on both ends of the circuit Circuit SW1 4 Ass
10. the digital service provider and indicates a problem with the service provider s equipment If this condition persists contact your service provider ER glows red to indicate that an error has been detected in the received signal ER will flash if the Model 2500 Series receives illegal bi polar violations or framing errors During the 511 or 511 E test ER will flash to indicate that the Test Pattern Detector has detected a bit error TM glows red to indicate Test Mode It will light if the unit is placed into a test mode The unit can be placed in test mode by the local user by the remote user or by the service provider 5 2 STATUS DISPLAYS The Model 2500 Series lets you use a VT 100 type RS 232 terminal to display the current configuration settings as well as the line loop status 5 2 1 DISPLAYING CONFIGURATION SETTINGS To display the current settings of the hardware and or software switches go to the Main Menu see Section 4 2 and select item 2 Read Configuration This will take you to the Read Configuration Menu below continued 23 24 Figure 5 The Model 2500 Series front panel LEDs 25 26 In the Read Configuration Menu you may select item 1 to read the hardware switch configuration or item 2 to read the software switch configuration A sample screens is shown below 5 2 2 DISPLAYING LINE LOOP STATUS To check the current status of the Model 2500 Series and the associated c
11. you activate the Model 2500 Series DTR Dialing feature by storing a phone number in the unit s non volatile memory The Model 2500 Series automatically dials this number when the DTE raises the DTR lead When you issue this command the Model 2500 Series responds with this prompt Enter up to 12 digits without hyphens or other alphabetic characters followed by RETURN For example 13015551212 Note To disable DTR dialing press RETURN and nothing else when asked to enter the number to be stored continued Read Stored Number Selecting item 2 in the Dial Menu lets you view the phone number currently stored in the Model 2500 Series non volatile memory Dial New Number Selecting item 3 in the Dial Menu lets you dial a number other than the one stored in non volatile memory When you select this menu item the Model 2500 Series responds with this prompt Enter up to 12 digits without hyphens or other alphabetic characters followed by RETURN For example 13015551212 After dialing the number the Model 2500 Series will display the message Dialing and then display each number as it is dialed The Model 2500 Series will then prompt the user to wait while the connection is made One of the following messages will then be displayed to indicate the success or failure or the connection CONNECT The called unit has answered NO WINK The central office did not send a wink signal wit
12. FORMATION Thank you for your purchase of this Patton Electronics product This product has been thoroughly inspected and tested and is warranted for One Year parts and labor If any questions or problems arise during installation or use of this product please do not hesitate to contact Patton Electronics Technical Support at 301 975 1007 1 1 WARRANTY STATEMENT Patton Electronics warrants all Model 2500 Series components to be free from defects and will at our option repair or replace the product should it fail within one year from the first date of shipment This warranty is limited to defects in workmanship or materials and does not cover customer damage abuse or unauthorized modification This product contains no serviceable parts therefore the user shall not attempt to modify the unit in any way If this product fails or does not perform as warranted your sole recourse shall be repair or replacement as described above Under no condition shall Patton Electronics be liable for any damages incurred by the use of this product These damages include but are not limited to the following lost profits lost savings and incidental or consequential damages arising from the use of or inability to use this product Patton Electronics specifically disclaims all other warranties expressed or implied and the installation or use of this product shall be deemed an acceptance of these terms by the user 1 2 RADIO AND TV INTERFERENCE The M
13. Pin Signal B SGND Signal Ground C RTS D CTS E DSR F CD H DTR L LL Local Loop M TM Test Mode N RL Remote Loop P TD R RD S TD T RD U XTC V RC W XTC X RC Y TC AA TC APPENDIX D Continued DB 25 CONNECTOR TERMINAL INTERFACE Pin Signal 1 Frame Ground 2 TD 3 RD 4 RTS 5 CTS 6 DSR 7 SGND Signal Ground 8 CD 15 TC 17 RC 18 LL Local Loop 20 DTR 21 RL Remote Loop 24 XTC 25 TM Test Mode CONTROL PORT INTERFACE 8 Position modular connector compliant with EIA 561 Pin Signal 4 Signal Ground 5 RD Output 6 TD Input APPENDIX E TRANSMITTER CLOCK SOURCE DURING TEST LOOPS RC Received Clock 37 38 Analog Originating Receiving Clock Mode Normal Loop Remote Loop Remote Loop Internal INT INT INT RC External EXT INT EXT EXT Network RC INT RC RC
14. USER MANUAL MODEL 2500 Series Models 2500 2510 2520 All Rate CSU DSU SALES OFFICE 301 975 1000 TECHNICAL SUPPORT 301 975 1007 Part 07M2500 C Doc 099021UC Revised 3 13 96 TABLE OF CONTENTS Section Page 1 0 General Information 2 1 1 Warranty Statement 1 2 Radio and TV Interference 1 3 FCC Information 1 4 Service Information 2 0 Product Overview 4 2 1 Product Features 2 2 General Product Description 2 3 Supported Applications 3 0 Installation 6 3 1 DTE Interface Connections 3 2 Network Interface Connections 3 3 Control Port Interface 3 4 Power 4 0 Configuration 8 4 1 Configuration Using Hardware Switches 4 2 Configuration Using Software Switches 5 0 Operation 23 5 1 LED Descriptions 5 2 Status Displays 5 3 Loopback Test Modes 5 4 The V 52 BER Test Pattern Generator 5 5 Switched 56 Dialing Commands Models 2510 amp 2520 Appendix A Specifications Appendix B Cable Recommendations Appendix C Factory Replacement Parts and Accessories Appendix D Interface Pin Assignments Appendix E Transmitter Clock Source During Test Loops 1 1 0 GENERAL IN
15. W2 5 SW2 6 Mode Description On Off External Clock Mode Transmit Clock derived from terminal interface Off Off Network Clock Mode Transmit clock derived Looped Clock Mode from the received line signal Use this mode for Dedicated DDS operation On On Internal Clock Mode Transmit Clock derived internally Off On Switched 56 Model 2510 2520 Anti Stream Timer The anti stream timer protects multidrop networks from a drop that is continuously transmitting If the terminal keeps RTS raised for more than 30 seconds the timer forces RTS off internally This allows the rest of the multidrop network to resume operation The CSU DSU remains in the forced off condition until the terminal drops RTS Timer Value in Sec at Various Line Rates SW2 7 Timer 56 19 2 9 6 4 8 2 4 On Disabled Off Enabled 2 4 8 15 30 CTS Delay The RTS CTS turn on delay can be set to Normal or Extended Delay in mSec at Various Line Rates SW2 8 CTS Delay 56 19 2 9 6 4 8 2 4 Off Normal 0 3 0 9 1 9 3 8 7 5 On Extended 1 3 3 8 7 5 15 30 4 2 CONFIGURATION USING SOFTWARE SWITCHES The Model 2500 Series CSU DSUs can be soft configured using a VT100 terminal or similar RS 232 DTE with terminal emulation To use software switches for configuration follow these steps 1 Connect the serial RS 232C port of the terminal to the modular EIA 561 control port on the front panel of the Model 2500 Series To construct an RS 232 to
16. al timing for tail circuit applications in which the RS 232 or V 35 ports of two Model 2500 Series units are interconnected Switched 56 Model 2510 and 2520 only When using a Model 2510 or 2520 with Switched 56 service select item 4 continued Anti Streaming Timer Choosing option a in the Software Switch Menu takes you to the Anti Stream Timer Menu below Note You must use lower case letters for options a thru e This option lets you enable or disable the anti streaming timer which protects multidrop networks from a drop that is continuously transmitting If the DTE asserts RTS for a period of time exceeding the timer interface the timer forces RTS off internally This allows the rest of the multidrop network to resume operation The Model 2500 Series holds RTS off until the terminal drops RTS The timer interval decreases as the line rate increases RTS CTS Delay Choosing option b in the Software Switch Menu takes you to the RTS CTS Delay Menu below This option lets you set the RTS CTS turn on delay to Normal or Extended The delay interval decreases as the line rate increases 5 0 OPERATION Once the Model 2500 Series unit is installed and configured properly it is ready to operate This section describes the function of the LED indicators the status displays the use of loopback test modes and Switched 56 dialing procedures Models 2510 and 2520 only 5 1 LED DESCRIPTIONS The Model
17. an be easily configured for dedicated DDS Clear Channel operation by means of the dip switches on the bottom of the enclosure or by means of the software control port Set the Line Rate to match the rate of service to which you subscribe Set the Mode switches for Network Clocking The Rate Converter and the Data Format options should be set as required for your application The remaining options may need to be set depending on your terminal equipment and your application Switched 56 Operation Models 2510 2520 The unit can be used in Switched 56 applications Set the Line Rate to 56 kbps Set the Mode switches for Switched 56 and enable Force RTS and Circuit Assurance Dial or store a number using the control port The Rate Converter and the Data Format options should be set as required for your application The remaining options may need to be set depending on your terminal equipment and your application Campus Area Short Haul Operation Models 2500 2520 The unit can also be used for campus area point to point short haul applications on private twisted pair wires Set the Line Rates the same on both units Set the Mode switch for the appropriate Transmit Clock Mode for your application Internal External and Looped Clock Modes are available Set the remaining options as needed by your terminal equipment or your application 5 MODEL 2500 SERIES APPLICATIONS 2500 2510 2520 Line Rate Switches All line rates 56 Kbps only A
18. bit 1 8 None 1 or more 1 7 1 1 or more 1 7 None 2 On 11 bit 1 8 1 1 or more 1 9 None 1 or more Data Format The data format selection controls whether an async to sync conversion is performed Data is always transferred synchronously between the two CSU DSU s SW1 7 Data Format On Asynchronous Off Synchronous Note1 The async rate of 57 6 kbps is supported at the 56kbps line rate provided the DTE equipment transmits two stop bits Two stop bits can be configured on most DTE equipment This extra stop bit reduces the DTE s effective data rate by a few percent to allow synchronization with the 56kbps line speed Note2 Lower speed asynchronous data can be transmitted on synchronous circuits by simple over sampling To do this leave Data Format set to synchronous Make sure the CSU DSU s sync data rate is at least 4 times more than the async data rate you wish to send DSR Loop Status The behavior of the DSR output during performance of a local loop can be controlled DSR SW1 8 Loop Status Description On DSR On DSR remains high On during the Analog Loop Off DSR Off DSR goes low Off during the Analog Loop 4 1 2 SWITCH SET SW2 The configuration switches on switch SW2 control the Rate Adapter DTE Rate Clock Mode Anti Stream Timer and RTS CTS Delay Figure 5 below summarizes SW2 switch settings including the factory defaults Following Figure 4 is a description of each switch setti
19. e Software Switch Menu select item e to go to the Local Line Loop Menu see below To activate LAL select item 1 Figure 6 Local analog loop 27 28 LAL Test Procedure Once LAL is activated the Model 2500 Series transmit output is connected to its own receiver The Test LED should be lit Follow these steps to complete the test 1 Verify that the data terminal equipment is operating properly and can be used for a test If a fault is indicated call a technician or replace the unit 2 Perform a BER bit error rate test on each unit using a separate BER tester The Model 2500 Series has a built in BER tester see Section 5 4 If the BER test equipment indicates no faults but the data terminal indicates a fault follow the manufacturer s checkout procedures for the data terminal Also check the interface cable between the terminal and the Model 2500 Series 5 3 2 REMOTE DIGITAL LOOPBACK RDL The Remote Digital Loopback RDL test checks the performance of both the local and remote Model 2500 Series and the communication link between them Any characters sent to the remote Model 2500 Series in this test mode will be returned back to the originating device For example characters typed on the keyboard of the local terminal will appear on the local terminal screen after having been passed to the remote Model 2500 Series and looped back see Figure 7 below RDL Test Activation The RDL test may be activated in
20. ection is entered 15 16 4 2 3 SETTING SOFTWARE SWITCH PARAMETERS From the Main Menu selecting item 3 Set Software Switch Parameters will take you to the Software Switch Menu below From this screen you can select any parameters that you wish to soft configure For each screen described below selecting a numbered option and pressing RETURN stores that option setting and returns you to the Software Switch Menu Note All lettered options must be entered in lower case Line Rate Choosing option 1 in the Software Switch Menu takes you to the Line Rate Menu below This option controls the signaling rate on the line Set it to match the speed of your digital service For line rates of 56 or 64 kbps it is possible to operate the DTE interface at a lower rate To do this set the line rate to 56 or 64 kbps Then set the DTE Speed as required Software Switch Menu option 7 Character Length Choosing option 4 in the Software Switch Menu takes you to the Character Length Menu below In asynchronous data format the Model 2500 Series supports 10 bit and 11 bit character lengths Set this option according to the characteristics of the data being transmitted DTE Data Format Choosing option 5 in the Software Switch Menu takes you to the Data Format Menu below This option controls whether an async to sync conversion is performed between the DTE and the Model 2500 Series Data is always transferred synchronously be
21. ent move the V 52 toggle switch UP activating the 511 E test see Note 2 The 511 E test transmits the 511 pseudorandom test pattern and injects intentional errors about once per second If the test is working properly the receiving CSU DSU s red Error LED will blink regularly A successful 511 E test will confirm that the link is in place and that the Model 2500 Series built in 511 generator and detector are working properly Note1 The 511 BER pattern can also be activated using the software control port Follow these steps From a terminal first go to the Main Menu and select item 3 to display the Software Switch Menu Section 4 2 In the Software Switch Menu select item c to go to the Send 511 Pattern Menu see below To send a 511 pattern select item 1 Note2 Control Port activation of the 511E pattern is not possible The 511E pattern may only be activated using the front panel toggle switch Figure 9 DSU loop Figure 8 CSU loop 31 32 5 5 SWITCHED 56 DIALING COMMANDS MODELS 2510 amp 2520 To access the Switched 56 dialing capabilities of the Mode 2500 Series go to the Main Menu see Section 4 2 and select item 5 Set Switched 56 Dialing Parameters This will take you to the Switched 56 Menu see below The following paragraphs describe the commands in the Switched 56 Menu Store Phone Number Enable DTR Dialing Selecting item 1 in the Dial Menu lets
22. ent bears the FCC registration number You may be requested to provide this information to your telephone company Your telephone company may make changes in its facilities equipment operations or procedures that could affect the proper operation of the Model 2500 Series If this happens the telephone company should give you advance notice to prevent the interruption of your service The telephone company may decide to temporarily discontinue your service if they believe your Model 2500 Series may cause harm to the telephone network Whenever possible they will contact you in advance If you elect to do so you have the right to file a complaint with the FCC If you have any trouble operating the Model 2500 Series please contact Patton Technical Support at 301 975 1000 The telephone company may ask you to disconnect the equipment from the telephone network until the problem has been corrected or until you are certain that the Model 2500 Series is not malfunctioning The following information may be required when applying to your local telephone company for leased line facilities Service Digital Facility Service Order Network Type Interface Code Code Jacks 2 4 Kbps Digital Interface 04DU5 24 6 0F RJ48S 4 8 Kbps Digital Interface 04DU5 48 6 0F RJ48S 9 6 Kbps Digital Interface 04DU5 96 6 0F RJ48S 56 Kbps Digital Interface 04DU5 56 6 0F RJ48S Note As of this publication date 19 2 and 64Kbps digital services have not been
23. ge shows the orientation of the DIP switches with respect to ON OFF positions 3 2 NETWORK INTERFACE CONNECTION The Network Interface is an 8 position modular connector Connect this port to the RJ 48S jack provided by the digital data service provider If the Model 2500 Series is being used for private short haul communication the twisted pair cable will connect to this port See Appendix D for the pin assignments of this connector 3 3 CONTROL PORT INTERFACE The Control Port Interface is an 8 position modular connector If it is to be used connect this port to an asynchronous terminal using a shielded cable See Section 4 4 for control port operation 3 4 POWER The model 2500 series has a built in powers supply that is factory configured for either 115 or 230 VAC depending on how the product is ordered This power supply is equipped with a shrouded male IEC 320 power entry connector and is available with a variety of domestic and international power cords see Appendix C In order for the Model 2500 Series unit to operate the power cord supplied must be attached to the power entry connector on the rear of the unit and plugged into an outlet that is easily accessible The power switch on the rear of the unit must also be turned ON 8 7 WARNING There are no user serviceable parts in the power supply section of the Model 2500 Series Voltage setting changes and fuse replacement should only be performed by qualified service
24. hin 5 seconds of line seizure SHORT WINK A wink signal less than 120 milliseconds was received LONG WINK A wink signal greater than 320 milliseconds was received NO CARRIER The called unit did not answer within 30 seconds DTR OFF DTR must be on to dial OFF HOOK The Model 2500 Series is already off hook and in data mode Note The control port will not respond to additional commands until one of the above response messages is issued Hang Up Selecting item 4 in the Dial Menu terminates the call CAUTION For proper Switched 56 operation you must enable the Circuit Assurance and Force RTS options as described in Section 4 0 Failure to do so may prevent the Model 2500 Series unit from answering incoming Switched 56 calls CAUTION Pressing RETURN by itself will erase any previously stored number from the unit s non volatile memory and cannot be undone This will also disable DTR dialing 33 34 APPENDIX A SPECIFICATIONS DDS Type Dedicated Transmission Format Asynchronous synchronous Interface RS 232 and V 35 Standards AT amp T 62310 compliant DDS Line Rates 2 4 4 8 9 6 19 2 56 and 64 kbps DTE Rates 2 4 4 8 9 6 19 2 38 4 56 and 64 kbps 57 6 kbps async 2 stop bits Control Port Configuration and diagnostics Transmission Line 4 wire Applications DDS point to point or multipoint campus area point to point Indicators LED indicators for TD
25. ircuit go to the Main Menu see Section 4 2 and select item 4 Display Line Loop Status 1 2 This will take you to a screen similar to the Line Loop Status Monitor Screen below Note1 To refresh the display with the most up to date information key 4 and press RETURN Note2 The error count is reset after each time it is displayed 5 3 LOOPBACK TEST MODES The Model 2500 Series offers three loopback tests to evaluate the condition of the CSU DSUs and the communication link local analog loopback remote digital loopback and telco loopback C O Loopback 5 3 1 LOCAL ANALOG LOOPBACK LAL The Local Analog Loopback LAL test checks the operation of the local Model 2500 Series Any data sent to the local Model 2500 Series in this test mode will be echoed returned back to the user device For example characters typed on the keyboard of a terminal will appear on the terminal screen see Figure 6 below LAL Test Activation The LAL test may be activated in one of three ways 1 Toggle the front panel Local Normal Remote switch UP to the Local position 2 Activate the LL lead from the DTE Note in order to use this option the DTE Loop Control option must be enabled see Section 4 1 2 If you are not sure which pin is the LL lead please refer to the pinout diagrams in Appendix D 3 From a terminal first go to the Main Menu and select item 3 to display the Software Switch Menu Section 4 2 In th
26. itched 56 operation Note When the Line Rate Software Switch Menu option 1 is 64 kbps RTS is always forced ON regardless of the Force RTS switch setting 17 18 Note2 You can use the Model 2500 Series to transmit lower speed asynchronous data up to 9 6 kbps over synchronous circuits by simple over sampling To do this select the synchronous data format and set the line Line Rate Software Switch Menu option 1 to at least four times that asynchronous data rate you wish to send For example use a Line Rate of 9 6 kbps or higher for 2 4 kbps async data DSR Status During Local Loopback Choosing option 6 in the Software Switch Menu takes you to the DSR Loop Status Menu below This option controls the behavior of the DSR output during local loopback To force DSR high ON during local loopback enable this option To force DSR low OFF during a local loopback disable it Rate Converter DTE Rate Choosing option 7 in the Software Switch Menu takes you to the Rate Adapter DTE Rate Menu opposite page The Model 2500 Series rate converter adapts a 56 kbps or 64 kbps line rate to slower DTE data rates Set the Rate Converter to match the DTE data rate If the DTE data rate is the same as the line rate disable rate conversion by selecting item 6 on this menu continued 19 20 Note For DTE data rates of 56 kbps or 64 kbps set the rate adapter to Line Rate DTE Rate and the line rate to 56 or 64 kbps respectively
27. ll line rates Supported Supported Mode Switches Supports all modes Switched 56 only All modes except Sw 56 Supported Not Supported Supported Supported Dialing Comments 4 0 CONFIGURATION Before you can operate your Model 2500 Series CSU DSU you must configure the unit Configuration may be done using the externally accessible hardware switches or by using the software switches Software switches can be accessed from the front panel control port using a VT 100 type RS 232 terminal that responds to ANSI escape sequences 4 1 CONFIGURATION USING HARDWARE SWITCHES The Model 2500 Series defaults to the use of hardware switches for configuration The unit can also use software switches for configuration see Section 4 3 in which case the hardware switches will be ignored Note If you are attempting to configure the unit using hardware switches and find they are being ignored you will need to override the software switches and force the unit back into hardware switch mode To do this power up the unit once with the Line Rate SW1 1 1 2 1 3 set to Off Off Off Then set the hardware switches as you require and power up the unit again The hardware configuration mode for the Model 2500 Series uses sixteen externally accessible DIP switches Figure 1 below shows the location of the Model 2500 Series DIP switches The Model 2500 Series DIP switches can be configured as either On or Off Figure 2 opposite pa
28. n this case the Model 2500 Series recognizes this and loops signals on the RX pair back to the central office on the TX pair see Figure 8 below While the CSU Loop is activated by the central office the TM light is illuminated DSU Loop The DSU Loop is activated when the central office sends a DSU loop signal over the twisted pair wire The Model 2500 Series senses this signal and loops the digital data back to the central office see Figure 9 below While the DSU Loop is activated the TM light is illuminated 5 4 THE V 52 BER TEST PATTERN GENERATOR The Model 2500 Series has a built in test pattern generator and detector It can be invoked at both ends of a link simultaneously using two operators or it can be invoked in conjunction with the LAL or RDL tests using one operator The following example requires two operators one to initiate and monitor the test at the local Model 2500 Series and one at the remote Model 2500 Series To use the V 52 BER test by itself both operators should simultaneously follow these steps continued 1 Locate the 511 511E toggle switch on the front panel of the Model 2500 Series and move it DOWN see Note 1 This activates the V 52 BER test mode and transmits a 511 pseudorandom test pattern to the other unit If any errors are received the receiving CSU DSU s red Error LED will blink sporadically see Notes 1 amp 2 below 2 If the test indicates no errors are pres
29. ng Rate Adapter DTE Rate The Model 2500 Series includes a rate adapter that allows the unit to be used with DTE devices that support rates lower than 56 64 kbps All switch settings below are valid for line rates of 56 or 64 kbps SW2 1 SW2 2 SW2 3 DTE Rate On On On 2 4 kbps Off On On 4 8 kbps On Off On 9 6 kbps Off Off On 19 2 kbps On On Off 38 4 kbps Off Off Off Line Rate DTE Rate Note for DTE devices that operate at 57 6 kbps set the Line Rate to 56 kbps see Section 4 1 1 set the rate adapter for Line Rate DTE Rate and configure your DTE device for two stop bits set character length accordingly 12 11 SWITCH SET 2 SUMMARY TABLE Figure 4 Summary of switch settings showing factory defaults Position Function Factory Default Switch SW2 1 Rate Adapter Off Switch SW2 2 DTE Rate Off Switch SW2 3 Off Switch SW2 4 DTE Loop Control Off Disabled Switch SW2 5 Clock Mode Off Off Switch SW2 6 Off On Switch SW2 7 Anti Stream Timer On Disabled Switch SW2 8 RTS CTS Delay Off Normal Model 2510 Switched 56 Network Clock DTE Rate DTE Loop Control The local loop and remote loop can be activated from the DTE interface using signals LL and RL SW2 4 On Enable LL and RL inputs Off Disable Clock Mode The appropriate transmitter clocking modes can be selected for Dedicated DDS Switched 56 or campus area private operation S
30. odel 2500 Series generates and uses 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 and television reception The Model 2500 Series 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 from such interference in a commercial installation However there is no guarantee that interference will not occur in a particular installation If the Model 2500 Series does cause interference to radio or television reception which can be determined by disconnecting the cables the user is encouraged to try to correct the interference by one or more of the following measures moving the computing equipment away from the receiver re orienting the receiving antenna and or plugging the receiving equipment into a different AC outlet such that the computing equipment and receiver are on different branches 2 2 0 PRODUCT OVERVIEW This section provides an overview of the Model 2500 Series including features general description and a breakdown of model numbers by application 2 1 PRODUCT FEATURES Operates over 4 wire dedicated digital lines Supports rates of 56 kbps and 64 kbps and all sub rates Supports Switched 56 dialing Provides both RS 232 and V 35 interfaces
31. tween two Model 2500 Series units For an asynchronous DTE select the asynchronous data format1 2 for a synchronous DTE select the synchronous data format Note1 The async rate of 57 6 kbps is supported at the 56 kbps line rate provided the DTE equipment transmits two stop bits Two stop bits can be configured on most DTE equipment This extra stop bit reduces the DTE s effective data rate by a few percent to allow synchronization with the 56 kbps line speed Set the Model 2500 Series for two stop bits by selecting 11 bit character length in the Character Length Menu continued Circuit Assurance Choosing option 2 in the Software Switch Menu takes you to the Circuit Assurance Menu below On dedicated DDS circuits the transmitter and the CTS output can be configured to go ON only when a working communication circuit is established If you use Circuit Assurance with DDS services enable it on only one end of the communication link For Switched 56 service enable Circuit Assurance on both ends of the circuit When Circuit Assurance is disabled the transmitter and CTS operate without regard to the receiver state Force RTS Choosing option 3 in the Software Switch Menu takes you to the RTS Menu below The RTS input can be forced ON ignoring the RTS signal from the DTE RTS controls the transmitter by sending either user data when high or idle code when low On a Model 2510 or 2520 Force RTS should be enabled for Sw
32. urance Description On Enabled CTS will go low and the transmitter will be held off if the receiver is in the No Signal state or CD is low Off Disabled The transmitter and CTS will operate without regard to the receiver state RTS The RTS input can be forced on ignoring the terminal s RTS signal RTS controls the transmitter by either sending the user s data or sending an idle code Force RTS should be enabled in Switched 56 mode SW1 5 RTS Description Off Forced On An On high condition is trans mitted regardless of the state of this unit s RTS input On Follows DTE The RTS input controls the transmitter Note At 64K line rate RTS is always Forced On 9 10 ON Figure 2 Close up of DIP switches showing ON OFF positions SWITCH SET 1 SUMMARY TABLE 56 000 bps Figure 3 Summary of switch settings showing factory defaults Position Function Factory Default Switch SW1 1 Line Rate Off Switch SW1 2 On Switch SW1 3 On Switch SW1 4 Circuit Assurance Off Disabled Model 2510 Enabled Switch SW1 5 RTS Off Forced On Switch SW1 6 Character Length Off 10 Bit Switch SW1 7 Data Format Off Synchronous Switch SW1 8 DSR Loop Status Off DSR Off Character Length In asynchronous data format 10 and 11 bit characters are supported This setting is ignored in synchronous data format Character Character Description SW1 6 Length Start Data bits Parity Stop bits Off 10
33. wer switch off 2 Remove the power cord from the unit 3 Remove the two screws on the rear panel and slide the board out from the rear 4 Locate the DTE port selection jumper near the middle of the PC board This jumper has three pins two of which are covered by the strap The factory position of the jumper is with the strap covering the two pins closest to the rear of the unit 5 To reconfigure the Model 2500 Series for fixed V 35 operation move the strap so that it covers the two pins closest to the front of the unit 6 To reconfigure the Model 2500 Series for fixed RS 232 operation remove the strap altogether be sure not to lose the strap 3 1 1 V 35 INTERFACE PORT For V 35 operation attach your DTE terminal cable to the 34 pin rectangular M 34 connector The DTE cable should be pinned according to the diagram in Appendix D 3 1 2 RS 232 INTERFACE PORT For RS 232 operation attach your DTE terminal cable to the 25 pin DB 25 connector The DTE cable should be pinned according to the diagram in Appendix D 6 2 3 SUPPORTED APPLICATIONS The Model 2500 Series includes three units the Model 2500 All Rate CSU DSU the Model 2510 Switched 56 CSU DSU and the Model 2520 All Rate Switched 56 CSU DSU Depending upon the unit selected the Mode 2500 Series supports three distinct modes of operation These are outlined in the descriptions and table below Dedicated DDS Clear Channel Operation Models 2500 2520 The unit c
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