Multi-Tech Systems MT56DSU-S manual Description, CSU/DSU Basics, DSU Functions, CSU Functions

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Chapter 1 - Introduction

1.3Description

The MT56DSU-S is compact, easy to operate and has the features to allow flexibility in meeting your transmission requirements. The DDS is a service for transmission of digital signals via digital transmission facilities exclusively. The MT56DSU-S is designed to meet AT&T Technical Publication 62310 requirements. As such, the MT56DSU-S provides all the functions required on the customer side of the network.

You will find the MT56DSU-S easy to install, use and maintain. It is recommended that you read the entire manual early in your experience with the MT56DSU-S so you can appreciate all of the MT56DSU-S features and options.

1.4CSU/DSU Basics

A DSU (Data Service Unit) and a CSU (Channel Service Unit) are typically connected to provide the interface between DTE (data terminal equipment) and a DDS or other four-wire network.

The DSU processes serial synchronous digital data over the DDS network or other four-wire unloaded twisted-pair network.

The MT56DSU-S contains the functions of a DSU and CSU in a single package.

1.4.1 DSU Functions

The DSU encodes data as pulses on the communications line by converting the customer data stream to bipolar format for transmission over the digital network.

1.4.2 CSU Functions

The CSU terminates the digital circuit at the customer site. It performs line conditioning functions, ensures network compliance with FCC rules, and responds to test commands (either from the Telco central office (CO) or from the DSU).

The figure below shows the MT56DSU-S in a basic DDS network installation.

DDS

Network

DTE

DSU

DSU

DTE

Figure 1-2. Basic DSU/CSU Configuration

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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 Warranty Multi-Tech Systems, Inc. Warranty & Repairs Policies2 U.S. and Canadian Customers International Distributors International Customers outside U.S.A. and CanadaRepair Procedures for International Customers Repair Procedures for U.S. and Canadian CustomersRepairs 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
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