Multitech MT56DSU-R Manuel utilisateur

MultiDSU56KTM

Rack Mount Multi-Rate DSU

Model MT56DSU-R

Owner's Manual

82023101.p65 2/12/01, 2:52 PM1

Owners Manual

P/N 82023101, Rev. B

Model No. MT56DSU-R

This publication may not be reproduced, in whole or in part, without prior

expressed written permission from Multi-Tech Systems, Inc. All rights

reserved.

Multi-Tech Systems, Inc. makes no representations or warranties with

respect to the contents hereof and specifically disclaims any implied

warranties of merchantability or fitness for any particular purpose. Fur-

thermore, Multi-Tech Systems, Inc. reserves the right to revise this

publication and to make changes from time to time in the content hereof

without obligation of Multi-Tech Systems, Inc. to notify any person or

organization of such revisions or changes.

Record of Revisions

Revision Description

AManual released. All pages at Revision A.

(06/07/93)

BManual revised to change cable port numbers and

build

(01/09/95) instructions

Trademarks

Multi-Tech and the Multi-Tech logo are trademarks of Multi-Tech Sys-

tems, Inc.

DATAPHONE® is a registered trademark of AT&T.

Multi-Tech Systems, Inc.

2205 Woodale D ive

Mounds View, Minnesota 55112 USA

(612) 785-3500 o (800) 328-9717

Fax 612-785-9874

Tech Suppo t (800) 972-2439

BBS (612) 785-9875 o (800) 392-2432

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Contents

Chapter 1 - Introduction and Description

1.1 Int oduction ............................................................................... 6

1.2 About This Manual ................................................................... 6

1.3 Desc iption ................................................................................ 7

1.4 CSU/DSU Basics ..................................................................... 8

1.4.1 DSU Functions .............................................................. 8

1.4.2 CSU Functions .............................................................. 8

1.5 Featu es .................................................................................... 9

1.6 FCC Regulations fo Telephone Line Inte connection ..... 10

1.7 Specifications.......................................................................... 12

Chapter 2 -Hardware Installation

2.1 Int oduction ............................................................................. 16

2.2 Default DIP Switch and Jumpe Settings ........................... 16

2.2.1 12 -Position DIP Switch (# 1-12) .............................. 17

2.2.2 4-Position DIP Switch (# 13-16) ............................... 1 7

2.2.3 RS232/V.35 Shunt....................................................... 17

2.3 Changing the Default DIP Switch Settings ........................ 18

2.4 Installation P ocedu e ........................................................... 2 0

Chapter 3 - Operation

3.1 Int oduction ............................................................................. 24

3.2 Options .................................................................................... 2 4

3.2.1 Data Rate ..................................................................... 24

3.2.2 Async/Sync .................................................................. 24

3.2.3 Anti-St eaming ............................................................. 25

3.2.4 Elastic Sto e ................................................................. 25

3.2.5 System Status.............................................................. 26

3.2.6 Ci cuit Assu ance ........................................................ 2 6

3.2.7 Clocking ........................................................................ 27

3.2.8 RTS Fo ced On ........................................................... 27

3.2.9 DSR Fo ced On ........................................................... 28

3.2.10 Async Wo d Length .................................................... 28

iii

82023101.p65 2/12/01, 2:52 PM3

3.2.11 No mal/Diagnostics..................................................... 28

3.3 LED Indicato s ........................................................................ 2 9

3.4 Functions ................................................................................. 29

3.4.1 Local A ea Data Set Applications ............................. 29

3.4.2 Off-Net Extension Applications ................................. 30

Chapter 4 - Troubleshooting

4.1 Int oduction ............................................................................. 32

4.2 LED Indicato s ........................................................................ 3 2

4.2.1 RCV Indicato .............................................................. 33

4.2.2 XMT Indicato ............................................................... 33

4.2.3 CD Indicato ................................................................. 3 3

4.2.4 56K Indicato ................................................................ 33

4.2.5 19.2 Indicato ............................................................... 33

4.2.6 CTS Indicato ............................................................... 33

4.2.7 RTS Indicato ............................................................... 34

4.2.8 NS Indicato ................................................................. 34

4.2.9 TM Indicato ................................................................. 3 4

4.2.10 OOS Indicato .............................................................. 34

4.3 Diagnostic Tests ..................................................................... 35

4.3.1 Local Loopback Test ................................................... 35

4.3.2 Digital Loopback Test ................................................. 36

4.3.3 Digital Loopback With Test Patte n Test .................. 37

4.3.4 Test Patte n Test.......................................................... 38

4.3.5 DSU Loopback Test .................................................... 39

4.3.6 DSU Back-to-Back Test ............................................. 40

Chapter 5 - Warrant , Service and Tech Support

5.1 Se vice ..................................................................................... 42

5.2 Limited Wa anty .................................................................... 42

5.3 Tech Suppo t and BBS.......................................................... 43

5.4 Reco ding DSU Info mation ................................................. 43

Appendixes

Appendix A - Application Examples ............................................... 46

Appendix B - Inte face Signals and Connecto Pinouts ............. 50

Glossar

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MultiDSU56KTM

Chapter 1 - Introduction and Description

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MT56DSU-R Owner's Manua

1.1 Introduction

ongratulations! Your new MT56DSU-R is one of the finest DSU/

SUs available today. As a combined SU ( hannel Service Unit)

and DSU (Data Service Unit), it provides a direct connection to the

DATAPHONE® Digital Service (DDS) network. The MT56DSU-R

connects a computer or Data Terminal Equipment (DTE) to remote

equipment using DDS network lines at 2400, 4800, 9600, 19200 and

56000 bps speeds for point-to-point and multi-point service.

1.2 About This Manual

This manual contains five chapters and two appendixes. In addition,

there is a Glossary and an Index at the end of this manual. The

information in this manual is provided as described below.

Chapter 1 - Introduction and Description contains an introduction

to the MT56DSU-R product and its features and functions.

Chapter 2 - Hardware Installation provides configuration and

installation procedures.

Chapter 3 - Operation describes the functional features and options

of the MT56DSU-R.

Chapter 4 - Troubleshooting explains what to do if your

MT56DSU-R encounters problems in operation.

Chapter 5 - Ser ice, Warranty and Tech Support defines

procedures to follow if the troubleshooting steps in hapter 4 do not

fix the problem.

Appendix A - Applications Examples illustrates several DSU/ SU

uses that may help in understanding your particular installation site.

Appendix B - Interface Signals lists the various electronic signals

and connector pinouts related to the MT56DSU-R.

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Chapter 1 - Introduction and Description

1.3 Description

The MT56DSU-R is a rack-mounted DSU/ SU that is 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-R is designed to meet AT&T Technical Publication 62310

requirements. As such, the MT56DSU-R provides all of the functions

required on the customer side of the network.

The MT56DSU-R provides user selection of synchronous data

communications at rates of 2400, 4800, 9600, 19200 and 56000

bps, and asynchronous data communications rates up to 19200

bps. It provides three separate interface connections (RS232 , V.35

and DDS).

You will find the MT56DSU-R easy to install, use and maintain. It is

recommended that you read the entire manual early in your

experience with the MT56DSU-R so you can appreciate all of the

MT56DSU-R features and options.

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MT56DSU-R Owner's Manua

1.4 CSU/DSU Basics

A DSU (Data Service Unit) and a SU ( hannel Service Unit) are

typically connected to provide the interface between a DTE (data

terminal equipment) and the DDS (Digital Data Service) or other

four-wire network.

The DSU is used to process serial synchronous or asynchronous

digital data over the DDS network or other four-wire unloaded

twisted-pair wiring network.

The MT56DSU-R can transmit data at 56000, 19200, 9600, 4800

and 2400 bps in multi-point and point-to-point applications.

The MT56DSU-R contains the functions of a Data Service Unit

(DSU) and a hannel Service Unit ( SU) in a single package.

1.4.1 DSU unctions

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 unctions

The SU is used to terminate the digital circuit at the customer site.

It performs line conditioning functions, ensures network compliance

with F rules, and responds to test commands (either from the

telco central office ( O) or from the SU).

The figure below shows the MT56DSU-R in a basic DDS network

installation.

Figure 1-1.

Basic DSU/CSU Configuration

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Chapter 1 - Introduction and Description

1.5 eatures

The MT56DSU-R provides many useful features. Standard features

include V.35 and RS232 connections and either synchronous and

asynchronous transmission; synchronous at rates up to 56000 bps

and asynchronous up to 19200 bps; selectable digital data rates

that match the services offered by the carriers. Other features

include user-selectable clocking options, elastic store for analog off-

net extensions, anti-streaming, and RTS and DSR signal forced-on

selection.

Your Multi-Tech DSU/ SU provides the following features:

 supports direct connection to the DATAPHONE® Digital Data

Service (DDS) or compatible network

 selectable sync speeds of 2400, 4800, 9600, 19200 and 56000

bps

 selectable async speeds of 2400, 4800, 9600, and 19200 bps

 point-to-point and multipoint operation

 Standard RS232 , V.35 and DDS interfaces provided

 anti-streaming (for multi-point operations)

 elastic store (for analog off-net extensions)

 system status

 circuit assurance

 multiple selectable clocking

* External clocking

* Internal clocking

* DDS (slave) clocking

 RTS signal forced on selection

 DSR signal forced on selection

 multiple MT56DSU-R activated diagnostic tests:

* Local loopback test

* Digital loopback test

* Test pattern generator/detector

 multiple telco-activated diagnostic tests:

* DSU loopback test

* SU loopback test

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MT56DSU-R Owner's Manua

1.6 CC Regulations for Telephone Line

Interconnection

1. This equipment complies with Part 68 of the F rules. On the

outside surface of the rack is a label that contains, among other

information, the F registration number and ringer

equivalence number (REN). If requested, this information must

be provided to the telephone company.

2. As indicated in Appendix B, the suitable jack (USO )

connection arrangement for this equipment is shown. If

applicable, the facility interface codes (FI ) and service order

codes (SO ) are shown.

3. The ringer equivalence number (REN) is used to determine the

quantity of devices which may be connected to the telephone

line. Excessive REN's on the telephone line may result in the

devices not ringing in response to an incoming call. In most, but

not all areas, the sum of the REN's should not exceed five (5.0).

To be certain of the number of devices that may be connected

to the line, as determined by the total REN's, contact the

telephone company to determine the maximum REN for the

calling area.

4. If this equipment causes harm to the telephone network, the

telephone company will notify you in advance. But if advance

notice isn't practical, the telephone company will notify the

customer as soon as possible. Also, you will be advised of your

right to file a complaint with the F if you believe it is

necessary.

5. The telephone company may make changes in its facilities,

equipment, operation, or procedures that could affect the

operation of the equipment. If this happens, the telephone

company will provide advance notice in order for you to make

necessary modification in order to maintain uninterrupted

service.

6. If trouble is experienced with this equipment (the model of

which is indicated below) please contact Multi-Tech Systems,

Inc. at the address shown below for details of how to have

repairs made. If the trouble is causing harm to the telephone

network, the telephone company may request you remove the

equipment from the network until the problem is resolved.

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