Multitech MT64DSU Manual de usuario

Owner’s Manual

P/N 82034802Rev.C

Model MT64DSU

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

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

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 Description

BManual revised. Additional information on the CompuServe/

(6/10/96) Internet forums; information on Multi-Tech's Fax-Back Service;

documentation of a new DIP-Switch Summary; editorial and

format changesthroughout this manual.

CManual revised. Reproduced using new Owner's Manual

(12/15/98) format. Made technical corrections and editing updates.

Removed all references to 2-wire connector.

TRADEMARKS

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

Inc.

DATAPHONE is a registered trademark of AT&T.

All brand and product names mentioned in this publication are trademarks

or registered trademarks of their respective companies.

Multi-Tech Systems, Inc.

2205 Woodale Drive

Mounds View, Minnesota 55112 U.S.A.

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

U. S. FAX 612-785-9874

Fax-Back Service 612-717-5888

Technical Support (800) 972-2439

BBS (612) 785-3702 or (800) 392-2432

Internet Address: http://www.multitech.com

Contents

Chapter 1 - Introduction and Description

Introduction ................................................................................ 6

About This Manual ..................................................................... 7

DSU Basic Functions ................................................................. 8

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

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

Front Panel Indicators ................................................................ 9

Back Panel ............................................................................... 10

Features ................................................................................... 11

Technical Specifications ........................................................... 12

Chapter 2 - Installation and Cabling

Introduction .............................................................................. 14

Unpacking ................................................................................ 14

Safety Warnings ....................................................................... 14

Cabling Procedure ................................................................... 15

DIP Switch Settings.................................................................. 16

Chapter 3 - Testing

Diagnostic Tests ....................................................................... 22

DSU Loopback Test ................................................................. 22

Local Loopback Test................................................................. 23

Digital Loopback Test ............................................................... 24

Local Loopback Test With Test Pattern .................................... 25

Digital Loopback Test With Test Pattern Test ........................... 26

Remote Loopback Test............................................................. 27

Remote Loopback Test With Test Pattern Test......................... 28

DSU Back-to-Back Test............................................................ 29

iii

Chapter 4 - Warranty, Service and

Tech Support

Introduction .............................................................................. 32

Limited Warranty ...................................................................... 32

On-line Warranty Registration .................................................. 32

Tech Support ............................................................................ 33

Recording MultiDSU64K Information ................................. 33

Service 34

The Multi-Tech BBS ................................................................. 34

To log on to the Multi-Tech BBS......................................... 35

To Download a file.............................................................. 35

About CompuServe.................................................................. 36

About the Internet..................................................................... 36

About the Multi-Tech Fax-Back Service ................................... 37

Appendixes

Appendix A -AT Commands and S-Registers.......................... 40

Appendix B -Application Examples.......................................... 51

Appendix C - Interface Signals and Connector Pinouts ........... 56

Appendix D - DIP-Switch Summary ......................................... 62

Appendix E - FCC Regulations for Telephone Line

Interconnection ............................................................... 63

Index

MultiDSU64K

Chapter 1 - Introduction and Description

MT64DSU Owner's Manual

Introduction

Welcome to Multi-Tech's new MultiDSU64K a stand-alone integrated

Data Service Unit (DSU), model number MT64DSU, for accessing 4-

wire switched or dedicated digital links (Figure 1-1). The

MultiDSU64K is a compact easy to operate unit with features

allowing flexibility in meeting your transmission requirements. The

unit operates with 56 Kbps DDS (Digital Data Services) or switched

4-wire networks or compatible digital data services, and 64 Kbps

dedicated 4-wire services.

The unit contains V.35 and EIA RS-232C connectors on the back

panel to connect a computer or Data Terminal Equipment (DTE) and

a RJ-48 Line jack to connect to your DDS or compatible digital data

service. The MultiDSU64K supports AT dialing for asynchronous

operation and DTR dialing or V.25bis dialing for synchronous

operation.

CTSCDRD

Send RCV Carrier Clear Request On LineTest

RTS OL TM

Multi-Rate DSU-CSU

DSU64K

Figure 1-1. MultiDSU64K

Chapter 1 - Introduction and Description

About This Manual

This manual describes the MultiDSU64K and explains how to install

and cable the unit. The information contained in each chapter is as

follows:

Chapter 1 - Introduction and Description

This chapter provides an overview of DSU/CSU basics, information

on power, front panel indicators, back panel connectors, and a list of

the relevant technical specifications.

Chapter 2 - Installation and Cabling

Chapter 2 provides information on connecting the MultiDSU64K to a

computer or DTE device and a DDS network. The chapter provides

a detailed description of each of the MultiDSU64K DIP-Switch

options with all default settings.

Chapter 3 - Testing Your MultiDSU64K

Chapter 3 dicussess the MultiDSU64K's built-in test features.

Chapter 4 - Service, Warranty, Technical Support & BBS

Chapter 4 provides instructions for getting MultiDSU64Ks serviced

at the factory and information on product warranty; information

about Multi-Tech's user Bulletin Board Service (

BBS

), receiving

technical support via the CompuServe/Internet forums and

information on Multi-Tech's Fax-Back Service.

MT64DSU Owner's Manual

DSU Basic Functions

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 networks. A DSU converts data to a bipolar format for

transmission over the digital line. The CSU terminates the user's

digital circuit, does the line conditioning, provides FCC Rules

compliance, and handles the CO (Central Office) loopback

commands. The MultiDSU64K contains the functions of a Data

Service Unit (DSU) and a Channel Service Unit (CSU) in a single

package.

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.

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 or from the CSU).

Figure 1-2 shows the MultiDSU64K in a basic DDS network

installation.

Figure 1-2. Basic DSU/CSU Configuration

Chapter 1 - Introduction and Description

Front Panel Indicators

The MultiDSU64K has seven diagnostic LED indicators. They are:

DSU64K

CTSCDRD

Send RCV Carrier Clear Request On LineTest

RTS OL TM

Multi-Rate DSU-CSU

Figure 1-3. LED Indicators

SD Transmit (Send) Data: This LED blinks when data is

being transmitted, on for a space, off for a mark.

RD Receive Data: This LED blinks when data is being

received, on for a space, off for a mark.

CD Carrier Detect: This LED is lit when a valid signal

from the remote DSU is detected. This indicator is off

if the DSU receives an idle code. If RTS is off at the

remote DSU, then the network sends an idle code to

the local DSU.

CTS Clear To Send: The CTS (Clear to Send) LED lights

when the MultiDSU64K generates a CTS in response

to either an RTS signal received at the DTE connector,

or RTS forced on by the corresponding DIP-Switch.

RTS Request To Send: The RTS LED lights when the RTS

signal is received from the DTE. The DIP-Switch for

RTS Forced On does not affect this indicator. Refer to

Chapter 2 for switch settings.

OL On Line: The OL (On Line) LED lights to indicate the

MultiDSU64K has detected a signal from the network.

TM Test Mode: The TM LED lights when either Local

Loopback (to DTE), Remote Digital Loopback, Digital

Loopback (to line) or Test Pattern DIP-Switches are

enabled. If the Test Pattern DIP-Switch is enabled,

then the TM LED blinks when errors are detected.

When the TM LED is lit, network transmit/receive

operation cannot occur. Refer to the

“Diagnostic”

Tests

section for more information.

MT64DSU Owner's Manual

Back Panel

The cable connections for the MultiDSU64K are made at the back

panel. The input data (DCE interface) is through either an RS-232 or

V.35 connection; and, theDDS network connection is through an

RJ48S line jack.

LINE

OFF

POWER

EIA RS232C

Figure 1-4. Back Panel Connectors

RS-232C Connector

The RS-232C connector is used to connect the MultiDSU64K to a

computer or DTE device.

V.35 Connector

The V.35 connector is used to connect the MultiDSU64K to a

computer or DTE device.

RJ48S Jack

The RJ48 line interface jack is used to connect the MultiDSU64K to

a DDS network.

Multi DSU Loopback Cable

The Multi DSU loopback cable is used to test mux internal

composite link DSU or external DSU.

Power Connector

The Power connector is used to connect the external power supply

to the unit.

On/Off Switch

The power switch provides DC power to the unit when placed in the

ON position and terminates power when placed in the OFF position.

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