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MT56DSU2 Owner’s Manual

82017502

23

4.3.5 DSU Loopback Test

This test lets you verify proper DSU operation by matching a transmitted signal to the “looped-
back” receive signal. Refer to Appendix B for cable description.

1. Obtain a DSU Loopback cable (#45640100) from Multi-Tech, or assemble one. Refer to

Appendix B for instructions on building the Loopback cable.

2. Plug the Loopback cable into the back panel LINE jack.

3. If you send data from your DTE, it should be “looped back” to your DTE. If you have access to

a Bit Error Rate Tester, this can be used in place of the DTE.

Loopback
Cable

DSU

being tested

DTE

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Содержание MT56DSU2

Страница 1: ...MT56DSU2 Owner s Manual 82017502 1 MultiDSU56K Model MT56DSU2 Owner s Manual...

Страница 2: ...right to revise this publication and to make changes from time to time in the content hereof without obligation of Multi Tech Systems Inc to notify any person or organization of such revisions or cha...

Страница 3: ...11 Normal Diagnostics 16 3 3 LED Indicators 16 3 4 Functions 17 3 4 1 LADS Applications 17 3 4 2 Off Net Extension Applications 17 CHAPTER 4 TROUBLESHOOTING 4 1 Introduction 18 4 2 LED Indicators 18...

Страница 4: ...e Warranty and Tech Support defines procedures to follow if the troubleshooting steps in Chapter 4 do not fix the problem Appendix A Applications Examples illustrates several DSU CSU uses that may hel...

Страница 5: ...transmit data at 56000 19200 9600 4800 and 2400 bps in multi point and point to point applications The MultiDSU56K contains the functions of a Data Service Unit DSU and a Channel Service Unit CSU in...

Страница 6: ...ts direct connection to the DATAPHONE Digital Data Service DDS or compatible network selectable sync speeds of 2400 4800 9600 19200 and 56000 bps selectable async speeds of 2400 4800 9600 and 19200 bp...

Страница 7: ...customer as soon as possible Also you will be advised of your right to file a complaint with the FCC if you believe it is necessary 5 The telephone company may make changes in its facilities equipmen...

Страница 8: ...ormer 2 7 Lbs 1 2 Kg with power transformer Certification FCC Part 15 Class A FCC Part 68 UL Listed Compatibility AT T Pubs 62310 and 41450 FIC Codes 04DU5 24 2 4 Kbps digital interface 04DU5 48 4 8 K...

Страница 9: ...MT56DSU2 Owner s Manual 82017502 9 Delay Times in secs RTS CTS DCD on DCD off 2400 8 1 7 5 7 0 4800 4 3 2 6 3 5 9600 2 2 1 6 1 5 19200 1 0 0 8 0 7 56000 0 4 0 3 0 2...

Страница 10: ...may be a remote risk of electrical shock from lightning 7 Do not use the telephone to report a gas leak in the vicinity of the leak 8 To reduce the risk of fire use only No 26 AWG or larger Telecommu...

Страница 11: ...section 2 3 2 2 2 4 Position DIP Switch 13 16 The 4 position DIP switch is used to select Async Word Length Elastic Store and Anti Streaming options The defaults are 10 Bit Async Word Length Elastic S...

Страница 12: ...MT56DSU2 Owner s Manual 82017502 12 An adhesive backed label containing the DIP switch setting information is provided on the bottom of the MultiDSU56K a sample label is shown below for reference...

Страница 13: ...on 8 Up Synchronous operation Down Asynchronous operation Normal Loopback Test Mode 9 Up Normal operation Down Loopback Test Normal Test Pattern 10 Up Normal Down Test Pattern Circuit Assurance Enable...

Страница 14: ...interface connector depending on the DTE Connect the RS232C connector to the 25 pin DB25S receptacle Use the two screws to secure the connection or Connect the 34 position rectangular V 35 connector t...

Страница 15: ...a transmission rate The data rate selected here must match the DDS or other 4 wire network line rate that you subscribed for with your telco The default for this function is a data rate of 56K bps Ref...

Страница 16: ...eting momentary line interruptions as a communications channel failure Refer to Chapter 2 for changing the default DIP switch settings 3 2 6 Circuit Assurance This option when enabled causes the Multi...

Страница 17: ...the DTE The default for this function is a 10 bit async word 1 start 8 data no parity 1 stop bit length Refer to Chapter 2 for changing the default DIP switch settings 3 2 11 Normal Diagnostics The d...

Страница 18: ...an extension of the circuit for a special application In applications using the MuI1iDSU56K for an off net extension one Mu1tiDSU56K may be set for External Timing and the other set for DDS Timing ho...

Страница 19: ...quest NoSgnl Outage Test MultiDSU56K RD CD SD 96 48 19 2 56 TM Multi Rate DSU CSU Figure 4 1 MultiDSU56K Front Panel 4 2 1 SD Indicator The SD Transmit LED lights to indicate the DTE is sending data 0...

Страница 20: ...tion exists This occurs when there is a failure in the digital service detected by the network and the telco sends a repetitive OOS sequence If this indicator is on check the remote DSU for proper ins...

Страница 21: ...ERT Tester MultiDSU56K In Local Loopback Test Mode 4 3 2 Digital Loopback Test This test allows you to test the local DTE the local MultiDSU56K the communications link and the remote MultiDSU56K Use t...

Страница 22: ...ern Generator Test Pattern Detector No Signal NS LED Local MultiDSU56K In Test Pattern Mode Remote MultiDSU56K In Digital Loopback Mode 4 3 4 Test Pattern Test This test allows you to test the local M...

Страница 23: ...ble description 1 Obtain a DSU Loopback cable 45640100 from Multi Tech or assemble one Refer to Appendix B for instructions on building the Loopback cable 2 Plug the Loopback cable into the back panel...

Страница 24: ...from Multi Tech or assemble one Refer to Appendix B for instructions on building the Back to Back cable 2 Plug the cable into each DSU s LINE jack 3 On the good DSU set DIP switch 9 to the down positi...

Страница 25: ...register Tech Support Multi Tech has an excellent staff of technical support personnel available to help you get the most out of your Multi Tech product If you have any questions about the operation...

Страница 26: ...6 If you need to inquire about the status of the returned product be prepared to provide the serial number of the product sent Send DSUs to MULTI TECH SYSTEMS INC 2205 WOODALE DRIVE MOUNDS VIEW MINNES...

Страница 27: ...l Area Data Set External Clocking application and Analog Off Net Extension application DDS POINT TO POINT APPLICATION In this application the MultiDSU56K provides the interface between the DDS line an...

Страница 28: ...een a control station and two or more remote stations All data transmitted by the control station is sent to each remote station For data transmitted from the remote stations the MJUs combine bit stre...

Страница 29: ...on wires Figure A 3 Local Area Data Set Application EXTERNAL CLOCKING APPLICATION This application is similar to the Local Area Data Set application except for the timing option setting In the example...

Страница 30: ...DS circuits in an area where DDS is not available Site 3 in the example below or where the customer requires an extension of the DDS circuit for a special application Site 3 Analog Line Front End Proc...

Страница 31: ...iewed from the rear DESCRIPTION This connector ties the MultiDSU56K to the DDS Network The RJ48 connector is keyed for proper insertion of a keyed RJ48 plug PIN IDENTIFICATION Pin Description Destinat...

Страница 32: ...20 19 18 17 16 15 14 Transmitter Signal Element Timing As viewed from the rear DESCRIPTION This connector ties the MultiDSU56K to the DTE The DB25S connector has the following pinout configuration PI...

Страница 33: ...ct Receive Data A Receive Data B Receive Timing A Receive Timing B As viewed from the connector side DESCRIPTION This connector ties the MultiDSU56K to the DTE The V 35 connector has the following pin...

Страница 34: ...DSU for comparison to the original signal sent You can order this cable 45640100 from Multi Tech or build one using the instructions below Refer to Chapter 4 for test procedures SCHEMATIC RJ48S 1 2 3...

Страница 35: ...instructions below Refer to Chapter 4 for test procedures SCHEMATIC RJ48S 1 2 3 4 5 6 7 8 7 RJ48S 8 7 6 5 4 3 2 1 BUILD INSTRUCTIONS 1 Strip cable installation 3 4 2 Strip wires 1 2 7 and 8 on one end...

Страница 36: ...tal path on a cable on which data is transmitted A logical way to look at the path data travels when sent between locations circuit assurance an optional conditioning of the CTS signal Clear To Send C...

Страница 37: ...DSR data set ready an RS232 signal that indicates the DCE and line are ready to receive data DSU Data Service Unit a device used to interface a user s DSU to a digital circuit such as DDS or Ti Used i...

Страница 38: ...t directly connected with no intermediate nodes computers or branched circuits but possibly switching facilities A type of connection that links two and only two logical entities e g a phone line circ...

Страница 39: ...02 39 T test pattern a diagnostic test for sending detecting and checking a pre defined pattern of bits two wire circuit A circuit in which one channel line is used for communications in both directio...

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