Chapter 1 - Introduction - Multitech MT56DSU-S User Manual

1.1 Introduction
The Multi-Tech Systems MultiDSU, model number MT56DSU-S is a synchronous 56 Kbps data service unit
(DSU). As a combined DSU and Channel Service Unit (CSU), it provides a direct connection to the
®
DATAPHONE Digital Service (DDS) network. The MT56DSU-S connects a synchronous Data Terminal
Equipment (DTE) device to remote equipment using DDS network lines at 56 Kbps speeds for point-to-point
and multi-point service.
1.2 About This Manual
Chapter 1 - Introduction contains an introduction to the MT56DSU-S product and its features and functions.
Chapter 2 - Front and Rear Panel Descriptions provides front panel LED descriptions and rear panel
connector descriptions, DIP-switch settings, and an RS232/V.35 shunt description.
Chapter 3 - Unpacking and Setup provides unpacking, safety warnings, setup procedures, and how to
change the shunt from the default RS232 position to the V.35 position.
Chapter 4 - Diagnostic Testing explains how to set up and run a diagnostic test.
Chapter 5 - Service and Warranty provides instructions on getting service for your MultiDSU at the factory, a
statement of the limited warranty, information about our user bulletin board service, and space for recording
information about your MultiDSU prior to calling Multi-Tech's Technical Support. The final three sections
explain how to use our bulletin board service (BBS), and get support through CompuServe and the Internet.
Appendix A - Application Examples illustrates several DSU/CSU uses that may help in understanding your
particular installation site.
Appendix B - Interface Signal and Connector Pinouts lists the various electronic signals and connector
pinouts related to the MT56DSU-S.
Appendix C - Regulatory Information
Figure 1-1. MultiDSU Modem

Chapter 1 - Introduction

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