Multi-Tech Systems MT56DSU-S Back-To-Back Cable MTS P/N, Figure B-7. Back-toBack Cable Connector

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Appendix

Back-To-Back Cable (MTS P/N 45050000)

1

8

Figure B-7. Back-toBack Cable Connector

DESCRIPTION

This cable lets you test a suspect DSU by connecting it to a known good DSU. It tests the suspect DSU by connecting its Transmit signal to the Receive circuits of the good DSU. You can order this cable from Multi- Tech (#45050000), or build one using the instructions below. Refer to Chapter 4 for test procedures.

SCHEMATIC

1					8

2	7
3	6
4	5						RJ48S
RJ48S 5	4
6	3
7				2

8						1

			7"

Figure B-8.

BUILD INSTRUCTIONS

1.Strip cable installation 3/4".

2.Strip wires 1,2,7 and 8 on one end of cable and 8,7,2 and 1 on other end 1/4".

3.Cut unstripped wires off.

4.Solder wire 1 on one connector to 8 on the other.

5.Solder wire 2 on one connector to 7 on the other.

6.Solder wire 7 on one connector to 2 on the other.

7.Solder wire 8 on one connector to 1 on the other.

8.Cover solder connections with 1" of shrink tube.

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Contents User Guide MT56DSU-S Syncronous 56K bps Data Service UnitRevision Date Description Contents Service & Warranty Introduction About This Manual IntroductionCSU Functions DescriptionCSU/DSU Basics DSU FunctionsFeatures Specifications Front & Back Panel Descriptions Front Panel Front PanelBack Panel Power Connector2 RS232 Connector Line ConnectorSwitch Settings Mode Position Description Switch SettingsShunts ShuntsUnpacking & Setup Unpacking Telecom Safety WarningsBack Panel Connections SetupV.35 Shunt Diagnostics Loopback Test Loopback Test DiagramDSU Loopback Test Line Loopback TestDSU Back-to-Back Test DSU Back-to-Back Test DiagramService & Warranty 2 U.S. and Canadian Customers Multi-Tech Systems, Inc. Warranty & Repairs PoliciesWarranty International Distributors International Customers outside U.S.A. and CanadaRepairs Repair Procedures for U.S. and Canadian CustomersRepair Procedures for International Customers Internet Site Technical SupportAppendix DDS Point-To-Point Application Appendix a Application ExamplesIntroduction Local Area Data Set ApplicationFigure A-3. DDS Multipoint Polled Application DDS Multipoint Polled ApplicationRJ-48 Connector Appendix B Interface Signals and Connector PinoutsPin Description Signal DB25S ConnectorPin Description DB25S Connector with V.35 InterfaceBuild Instructions Loopback Cable MTS P/NBack-To-Back Cable MTS P/N Figure B-7. Back-toBack Cable ConnectorFCC Regulations for Telephone Line Interconnection Appendix C Regulatory InformationCanadian Limitations Notice S000327A