Multi-Tech Systems MT56DSU-S manual Loopback Cable MTS P/N, Build Instructions

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Appendix

Loopback Cable (MTS P/N 45640100)

1

8

Figure B-5. Loopback Cable Connector

DESCRIPTION

This cable lets you test the MT56DSU-S when a second DSU is not available. When the DSU generates a signal, this cable “loops” the signal back to the 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

1TRANSMIT

2TRANSMIT

3

4 RJ48S 5

6

7

8

RECEIVE

RECEIVE

6"

Figure B-6.

BUILD INSTRUCTIONS

1.Strip cable insulation 3/4"

2.Cut wires 3, 4, 5, 6 off.

3.Strip wires 1, 2, 7, 8 1/4"

4.Solder wires 1 and 8 together.

5.Solder wires 2 and 7 together.

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

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Image 34

Contents MT56DSU-S Syncronous 56K bps Data Service Unit User GuideRevision Date Description Contents Service & Warranty Introduction Introduction About This ManualDSU Functions DescriptionCSU/DSU Basics CSU FunctionsFeatures Specifications Front & Back Panel Descriptions Front Panel Front PanelLine Connector Power Connector2 RS232 Connector Back PanelSwitch Settings Switch Settings Mode Position DescriptionShunts ShuntsUnpacking & Setup Telecom Safety Warnings UnpackingSetup Back Panel ConnectionsV.35 Shunt Diagnostics Loopback Test Diagram Loopback TestLine Loopback Test DSU Loopback TestDSU Back-to-Back Test Diagram DSU Back-to-Back TestService & Warranty Warranty Multi-Tech Systems, Inc. Warranty & Repairs Policies2 U.S. and Canadian Customers International Customers outside U.S.A. and Canada International DistributorsRepair Procedures for International Customers Repair Procedures for U.S. and Canadian CustomersRepairs Technical Support Internet SiteAppendix Local Area Data Set Application Appendix a Application ExamplesIntroduction DDS Point-To-Point ApplicationDDS Multipoint Polled Application Figure A-3. DDS Multipoint Polled ApplicationAppendix B Interface Signals and Connector Pinouts RJ-48 ConnectorDB25S Connector Pin Description SignalDB25S Connector with V.35 Interface Pin DescriptionLoopback Cable MTS P/N Build InstructionsFigure B-7. Back-toBack Cable Connector Back-To-Back Cable MTS P/NAppendix C Regulatory Information FCC Regulations for Telephone Line InterconnectionCanadian Limitations Notice S000327A