Multitech MT56DSU2 Manuale utente

MT56DSU2 Owner’s Manual

82017502 1

MultiDSU56K

Model MT56DSU2

Owner’s Manual

MT56DSU2 Owner’s Manual

82017502 2

MultiDSU56K

Model MT56DSU2

Owner’s Manual

P/N 82017502 Rev. C

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

Multi-Tech Systems, Inc. makes no representation or warranties with respect to the contents

hereof and specifically disclaims any implied warranties of merchantability or fitness for any

particular purpose. Furthermore, 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 Date Description

A 10/01/92 Manual released. All pages at Revision A.

B 06/01/93 Manual revised with minor editorial changes.

C 09/07/93 Manual revised to add cable part numbers and build instructions.

TRADEMARKS

Multi-Tech and the Multi-Tech logo are trademarks of Multi-Tech Systems, Inc.

DATAPHONE is a registered trademark of AT&T.

Multi-Tech Systems, Inc.

2205 Woodale Drive

Mounds View, Minnesota 55112 U.S.A.

(763) 785-3500 or (800) 328-9717

U.S. Fax (763) 785-9874

Technical Support (800) 972-2439

www.multitech.com

MT56DSU2 Owner’s Manual

82017502 3

Table of Contents

CHAPTER 1-INTRODUCTION AND DESCRIPTION

1.1 Introduction 5

1.2 About This Manual 5

1.3 Description 5

1.4 CSU/DSU Basics 6

1.5 Features 7

1.6 FCC Regulations for Telephone Line Interconnection 8

1.7 Specifications 9

CHAPTER 2- HARDWARE INSTALLATION

2.1 Introduction 10

2.2 Default DIP Switch Settings 10

2.3 Changing Default Settings 11

2.4 Installation Procedure 12

CHAPTER 3- OPERATION

3.1 Introduction 14

3.2 Options 14

3.2.1 Data Rate 14

3.2.2 Async/Sync 14

3.2.3 Anti-Streaming 15

3.2.4 Elastic Store 15

3.2.5 System Status 15

3.2.6 Circuit Assurance 15

3.2.7 Clocking (Internal, External orDDS) 15

3.2.8 RTS Forced On 16

3.2.9 DSR Forced On 16

3.2.10 Async Word Length (9/10/11 Bit) 16

3.2.11 Normal/Diagnostics 16

3.3 LED Indicators 16

3.4 Functions 17

3.4.1 LADS Applications 17

3.4.2 Off-Net Extension Applications 17

CHAPTER 4- TROUBLESHOOTING

4.1 Introduction 18

4.2 LED Indicators 18

4.2.1 SD Indicator 18

4.2.2 RD Indicator 18

4.2.3 CD Indicator 18

4.2.4 56K Indicator 19

4.2.5 19.2 Indicator 19

4.2.6 96 Indicator 19

4.2.7 48 Indicator 19

4.2.8 CTS Indicator 19

4.2.9 RTS Indicator 20

4.2.10 NS Indicator 20

4.2.11 005 Indicator 20

4.2.12 TM Indicator 20

4.3 Diagnostic Tests 20

4.3.1 Local Loopback Test 20

4.3.2 Digital Loopback Test 21

4.3.3 Digital Loop Test With Test Pattern Test 22

4.3.4 Test Pattern Test 22

4.3.5 DSU Loopback Test 23

4.3.6 DSU Back-to-Back Test 23

CHAPTER 5- SERVICE, WARRANTYAND TECH SUPPORT

5.1 Service 24

5.2 Limited Warranty 24

5.3 Tech Support 25

5.4 Recording DSU Information 25

APPENDICES

Appendix A —Application Examples 26

Appendix B —Interface Signals and Connector Pinouts 30

GLOSSARY 35

MT56DSU2 Owner’s Manual

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Chapter 1 - Introduction and Description

1.1 Introduction

Congratulations! Your new MultiDSU56K is one of the finest DSU/CSUs available today. As a

combined CSU (Channel Service Unit) and DSU (Data Service Unit), it provides a direct

connection to the DATAPHONE®Digital Service (DDS) network. The MultiDSU56K 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 MultiDSU56K 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 MultiDSU56K.

Chapter 4 - Troubleshooting explains what to do if your MultiDSU56K encounters problems in

operation.

Chapter 5 - Service, Warranty and Tech Support defines procedures to follow if the

troubleshooting steps in Chapter 4 do not fix the problem.

Appendix A - Applications Examples illustrates several DSU/CSU 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 MultiDSU56K.

Glossary - defines the technical terms used in this manual.

1.3 Description

The MultiDSU56K 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 MultiDSU56K is designed to meet AT&T Technical

Publication 62310 requirements. As such, the MultiDSU56K provides all of the functions required

on the customer side of the network.

The MultiDSU56K 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 (RS232C, V.35 and DDS).

You will find the MultiDSU56K easy to install, use and maintain. It is recommended that you read

the entire manual early in your experience with the MultiDSU56K so you can appreciate all of the

MultiDSU56K features and options.

MT56DSU2 Owner’s Manual

82017502 5

NS DOS

RTS

CTS

Send Rcv Carrier 56K 19.2K 9600 4800 Clear Request NoSgnl Outage Test

MultiDSU56K

RD CD

SD 96 48

19.2

56 TM

Multi-Rate DSU/CSU

Figure 1-1. Multi-Tech System’s MultiDSU56K

1.4 CSU/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 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 MultiDSU56K can transmit data at 56000, 19200, 9600, 4800 and 2400 bps in multi-point

and point-to-point applications.

The MultiDSU56K contains the functions of a Data Service Unit (DSU) and a Channel Service

Unit (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 is used to terminate 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 CSU).

The figure below shows the MultiDSU56K in a basic DDS network installation.

DTE

DDS

Network

DTE

MultiDSU56K

Figure 1-2. Basic DSU/CSU Configuration

MT56DSU2 Owner’s Manual

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1.5 Features

The MultiDSU56K provides many useful features. Standard features include V.35 and RS232

connections and either synchronous or asynchronous transmission; synchronous at rates up to

56000 bps and asynchronous up to 19200 bps; selectable digital 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 MultiDSU56K 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 RS232C, 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 MultiDSU56K-activated diagnostic tests:

* Local loopback test

* Digital loopback test

* Test pattern generator/detector

•multiple Telco-activated diagnostic tests:

* DSU loopback test

* CSU loopback test

MT56DSU2 Owner’s Manual

82017502 7

1.6 FCC Regulations for Telephone Line Interconnection

1. This equipment complies with Part 68 of the FCC rules. On the outside surface of this

equipment is a label that contains, among other information, the FCC registration number and

ringer equivalence number (REN). If requested, this information must be provided to the

telephone company.

2. As indicated below, the suitable jack (USOC) connecting arrangement for this equipment is

shown in Appendix B. If applicable, the facility interface codes (FIC) and service order codes

(SOC) are also indicated.

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

FCC if you believe it is necessary.

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

7. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its

licensees. Unauthorized repairs void registration and warranty.

8. This equipment cannot be connected to public coin service provided by the telephone

company. (Contact the state public utility commission, public service commission or

corporation commission for information.)

Manufacturer: Multi-Tech Systems, Inc.

Model Number: MT56DSU2

FCC Pt 68 Registration #: AU7USA-18883-DE-N

Ringer Equivalence: N/A

SOC Codes: 6.0N

Modular jack (USOC): RJ48S

Service Center in U.S.A.: Multi-Tech Systems, Inc.

2205 Woodale Drive

Mounds View, MN 55112 USA

(763) 785-3500 or (800) 328-9717

U.S. Fax (763) 785-9874

MT56DSU2 Owner’s Manual

82017502 8

1.7 Specifications

Model Number MT56DSU2

Device Operation combined DSU and CSU

Data Rates

Synchronous: 2400, 4800, 9600, 19200, 56000 bps

Asynchronous: 2400, 4800, 9600, 19200 bps

Interfaces

RS232C DB25S (female)

V.35 34-pos. rectangular (female)

DDS RJ48 8-position keyed jack

Power Requirements 117V AC, 50-60 Hz, 10 Watts

Temperature 0 to 50 degrees C

Humidity 95% (non-condensing)

Dimensions 1.38" H x 6.15" W x 9" D

3.5 cm H x 15.6 cm W x 22.9 cm D

Weight 2 Lbs. (.9 Kg.) without power transformer

2.7 Lbs. (1.2 Kg.) with power transformer

Certification FCC Part 15 Class A

FCC Part 68

UL Listed

Compatibility AT&T Pubs 62310 and 41450

FIC Codes 04DU5-24 2.4 Kbps digital interface

04DU5-48 4.8 Kbps digital interface

04DU5-96 9.6 Kbps digital interface

04DU5-19 19.2 Kbps digital interface

04DU5-56 56 Kbps digital interface

USOC Jack RJ48S

Transmitter/Receiver:

Modulation bipolar return to zero

Transmit Level 1.4V peak (+6dBm) into 135 Ohm at

2400, 4800, 19200, and 56000 bps

0.7V peak (0 dBm) into 135 ohm at

9600 bps

Output Impedance 135 ohms

Receive Levels +6 to -40 dBm at 2400 bps

+6 to -40 dBm at 4800 bps

0 to -40 dBm at 9600 bps

+6 to -40 dBm at 19200 bps

+6 to -45 dBm at 56000 bps

Input Impedance 135 ohms

MT56DSU2 Owner’s Manual

82017502 9

Delay Times (in secs.):

RTS/CTS DCD on DCD off

2400 8.1 7.5 7.0

4800 4.3 2.6 3.5

9600 2.2 1.6 1.5

19200 1.0 0.8 0.7

56000 0.4 0.3 0.2

MT56DSU2 Owner’s Manual

82017502 10

Chapter 2 –Hardware Installation

2.1 Introduction

This chapter provides the information needed to configure and install the MultiDSU56K. This manual

assumes the reader is familiar with the function and operation of data communications equipment and is

technically qualified to provide installation service.

Safety Warning Telecom

1. Never install telephone wiring during a lighting storm.

2. Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.

3. This product is to be used with UL and cUL listed computers.

4. Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at

the network interface.

5. Use caution when installing or modifying telephone lines.

6. Avoid using a telephone (other than a cordless type) during an electrical storm. There may be a remote

risk of electrical shock from lightning.

7. Do not use the telephone to report a gas leak in the vicinity of the leak.

8. To reduce the risk of fire, use only No. 26 AWG or larger Telecommunication line Cord.

2.2 Default DIP Switch Settings

The MultiDSU56K printed circuit board contains one 12-position DIP switch block and one 4-position DIP

switch block as shown in Figure 2-1. They are located on the side of the circuit board, and are accessible

through the side of the chassis. Each individual switch is numbered, and can be in either the up (OPEN) or

down (closed) position.

The MultiDSU56K is shipped from the factory with the configuration DIP switches set to the most

common settings.

The factory-set (default) settings are: 56K bps data rate, DDS Clocking, RTS Forced On, DSR Forced On,

Sync Mode, Loopback Test Disabled, Test Pattern Disabled, Circuit Assurance Disabled, System Status

Disabled, 10-Bit Async Word Length, Elastic Store Disabled, and Anti-Streaming Disabled. If you need to

change any of these settings, refer to the Changing Defaults sections below.

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