Loopback Cable MTS P/N | Multi-Tech Systems MT56DSU-S guide

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

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

Contents

MT56DSU-S Syncronous 56K bps Data Service Unit User Guide Revision Date Description Contents Service & Warranty Introduction Introduction About This Manual DSU Functions DescriptionCSU/DSU Basics CSU Functions Features Specifications Front & Back Panel Descriptions Front Panel Front Panel Line Connector Power Connector2 RS232 Connector Back Panel Switch Settings Switch Settings Mode Position Description Shunts Shunts Unpacking & Setup Telecom Safety Warnings Unpacking Setup Back Panel Connections V.35 Shunt Diagnostics Loopback Test Diagram Loopback Test Line Loopback Test DSU Loopback Test DSU Back-to-Back Test Diagram DSU Back-to-Back Test Service & Warranty Warranty Multi-Tech Systems, Inc. Warranty & Repairs Policies2 U.S. and Canadian Customers International Customers outside U.S.A. and Canada International Distributors Repair Procedures for International Customers Repair Procedures for U.S. and Canadian CustomersRepairs Technical Support Internet Site Appendix Local Area Data Set Application Appendix a Application ExamplesIntroduction DDS Point-To-Point Application DDS Multipoint Polled Application Figure A-3. DDS Multipoint Polled Application Appendix B Interface Signals and Connector Pinouts RJ-48 Connector DB25S Connector Pin Description Signal DB25S Connector with V.35 Interface Pin Description Loopback Cable MTS P/N Build Instructions Figure B-7. Back-toBack Cable Connector Back-To-Back Cable MTS P/N Appendix C Regulatory Information FCC Regulations for Telephone Line Interconnection Canadian Limitations Notice S000327A