Multi-Tech Systems MT56DSU-S Loopback Cable (MTS P/N 45640100)

Appendix

Loopback Cable (MTS P/N 45640100)

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

RJ48S

RECEIVE

TRANSMIT

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.

Contents

Main Revision Date Description Contents Page Page 1.1 Introduction 1.2 About This Manual 1.3 Description 1.4 CSU/DSU Basics 1.4.1 DSU Functions 1.4.2 CSU Functions 1.5 Features 1.6 Specifications Page 2.1 Introduction 2.2 Front Panel 2.3 Back Panel 2.3.1 POWER Connector 2.3.2 RS232 Connector 2.3.3 LINE Connector 2.4 Switch Settings 2.5 Shunts Page 3.1 Introduction 3.2 Unpacking 3.3 Telecom Safety Warnings 3.4 Setup 3.5 V.35 Shunt Page 4.1 Introduction 4.1.1 Loopback Test 4.1.2 Line Loopback Test 4.1.3 DSU Loopback Test 4.1.4 DSU Back-to-Back Test Page 5.1 Multi-Tech Systems, Inc. Warranty & Repairs Policies 5.1.1 Warranty 5.1.2 U.S. and Canadian Customers 5.1.3 International Customers (outside U.S.A. and Canada) 5.1.4 International Distributors 5.2 Repairs 5.2.1 Repair Procedures for U.S. and Canadian Customers 5.2.2 Repair Procedures for International Customers 5.2.3 Repair Procedures for International Distributors 5.2.4 Replacement Parts 5.3 Technical Support 5.4 Internet Site Page Appendix A - Application Examples Introduction Local Area Data Set Application DDS Point-To-Point Application DDS Multipoint (Polled) Application Appendix B - Interface Signals and Connector Pinouts RJ-48 Connector DB25S Connector DB25S Connector with V.35 Interface Loopback Cable (MTS P/N 45640100) Back-To-Back Cable (MTS P/N 45050000) Appendix C - Regulatory Information FCC Regulations for Telephone Line Interconnection Canadian Limitations Notice