3COM DIGITAL MODEM User Manual

0 (0)

MPACT

XTERNAL

ISDN E M

ODEM USER

A member of the 3Com Impact product family

UIDE

IGITAL

Part No. 09-0699-002 Published August 1995

3Com Corporation ■ 5400 Bayfront Plaza ■ Santa Clara, California ■ 95052-8145

3Com Corporation, 1995. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without permission from 3Com Corporation.

3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notiﬁcation of such revision or change.

3Com Corporation provides this documentation without warranty of any kind, either implied or expressed, including, but not limited to, the implied warranties of merchantability and ﬁtness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

UNITED STATES GOVERNMENT LEGENDS:

If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following restricted rights:

For units of the Department of Defense:

Restricted Rights Legend:

as set forth in subparagraph (c) (1) (ii) for restricted Rights in Technical Data and Computer Software clause at 48 C.F.R. 52.227-7013. 3Com Corporation, 5400 Bayfront Plaza, Santa Clara, California 95052-8145.

For civilian agencies:

Restricted Rights Legend: Use, reproduction or disclosure is subject to restrictions set forth in

subparagraph (a) through (d) of the Commercial Computer Software - Restricted Rights Clause at 48 C.F.R. 52.227-19 and the limitations set forth in 3Com Corporation’s standard commercial agreement for the software. Unpublished rights reserved under the copyright laws of the United States.

The software described in this documentation is furnished under a license agreement included with the product either as a separate document or on the software distribution diskette in a root directory ﬁle named LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.

Unless otherwise indicated, registered trademarks are registered in the United States and may or may not be registered in other countries.

3Com is a registered trademark of 3Com Corporation. Async-PPP, Impact, and QuickSelect are trademarks of 3Com Corporation. 3ComFacts, Ask3Com, and NetFacts are service marks of 3Com Corporation.

CompuServe is a registered trademark of CompuServe, Inc.

IBM, AT, and Power PC are trademarks of International Business Machines Corporation. Apple, Macintosh, and Power Macintosh are trademarks of Apple Computer Corporation. UL is a trademark of Underwriters Laboratories, Inc. Pentium is a trademark of Intel Corporation. Microsoft, MS-DOS, and Windows are trademarks of Microsoft Corporation. Siemens is a trademark of Siemens Artiengesellschaft. Northern Telecom is a trademark of Northern Telecom Limited. AT&T is a trademark of American Telephone & Telegraph Company. Motorola is a trademark of Motorola, Inc. TurboCom is a trademark of Bio-Engineering Research Laboratory. AdTran is a trademark of AdTran, Inc. Delrina, WinComm, and WinFax are trademarks of Delrina Corporation.

Other brand and product names may be registered trademarks or trademarks of their respective holders.

Guide written by Anne Bailey. Edited by Nancy Kurahashi. Technical illustration by Tim Buckreus. Production by Yvonne Sartain.

Use, duplication or disclosure by the Government is subject to restrictions

ONTENTS

BOUT THIS GUIDE

Introduction i How to Use This Guide i Conventions ii

NTRODUCTION

3Com Impact Digital Modem Features 1-3

Data Capabilities 1-4 Voice Capabilities 1-4 Simultaneous Data and Voice Capabilities 1-4 Analog Modem Capabilities 1-5

3Com Impact Digital Modem Package Contents 1-5

Standard Package Contents 1-5

Additional Contents 1-5 ISDN Digital Line Conﬁguration Requirements 1-6 Computer System Requirements 1-7

IBM PC or Compatible Requirements 1-8

Apple Macintosh Requirements 1-8 Cabling Requirements 1-9

NSTALLING AND CONFIGURING

THE

IGITAL MODEM

Installing the 3Com Impact Digital Modem 2-3

Installing the Digital Modem in an IBM-compatible PC 2-3

Installing the Digital Modem in an Apple Macintosh Computer 2-4 Conﬁguring the 3Com Impact Digital Modem 2-6

Conﬁguration for IBM PC or Compatible Computer 2-7

Conﬁguration for Apple Macintosh Computer 2-13 Placing and Receiving Calls 2-15

Placing ISDN Data Calls 2-15

Multilink PPP Calls With Dynamic Bandwidth Allocation 2-15

Placing Analog Modem Calls 2-17

Using Communications Software to Place Calls 2-17

Receiving Data Calls 2-17

Using the Phone Out Port 2-17

Placing Calls Using the Phone Out Port 2-18 Receiving Calls Using the Phone Out Port 2-18

Protocol Support 2-19

Async-Sync PPP Conversion 2-19 QuickSelect 2-19

ROUBLESHOOTING

Troubleshooting Tips 3-1 Downloading Firmware to Your External Digital Modem 3-5

AT C

OMMAND SET OVERVIEW

AT C

OMMANDS

AT Command Set for the 3Com Impact

Digital Modem B-1 AT Command Set for Internal Analog Fax Modem B-4 Remote S Registers B-7 Digital Modem Result Codes B-10

ECHNICAL SUPPORT

On-line Technical Services C-1

3Com Bulletin Board Service C-1 World Wide Web Site C-2 Ask3Com on CompuServe C-2

3ComFacts Automated Fax Service C-2 Support from Your Network Supplier C-3 Support from 3Com C-4 Returning Products for Repair C-4

IMITED WARRANTY

FCC C

LASS

, R

EGISTERS, AND RESULT CODES

ERTIFICATION STATEMENT

B C

ANADIAN NOTICE

IGURES

1-1

Analog and Digital Network Access with the 3Com Impact Digital Modem 1-2

2-1

Back Panel Power Switch and Connectors 2-1

2-2

Front Panel LED Indicators 2-1

2-3

Conﬁguration Dialog Box 2-8

ABLES

Text Conventions ii

Notice Icons ii

1-1

ISDN Ordering Information by Switch Type 1-7

1-2

Pin Descriptions 1-9

2-1

Front Panel LED Indicator Deﬁnitions 2-2

B-1

AT Command Set Summary B-1

B-2

AT Command Set Summary for the Internal Analog Modem B-4

B-3

Remote S Registers B-7

B-4

3Com Impact Digital Modem Result Codes B-10

BOUT THIS

Introduction

This guide describes how to install, operate, and troubleshoot the 3Com Modem, referred to throughout this guide as the 3Com Impact digital modem.

If the information in the release notes shipped with your product differs from the information in this guide, follow the release notes. Be sure to read the README.TXT or Read Me ﬁles on the applicable software utility diskette for the latest product information.

How to Use This Guide

The following table shows where to ﬁnd speciﬁc information in this guide.

UIDE

Impactä ISDN External Digital

If you are looking for:

General information about the 3Com Impact digital modem Chapter 1

Instructions for installing and operating the digital modem Chapter 2

Simple digital modem troubleshooting tips Chapter 3

Instructions for using the AT command line set Appendix A

Tabular summary of the AT command line set, registers, and result codes

Information about 3Com’s technical support Appendix C

Turn to:

Appendix B

BOUT THIS GUIDE

Conventions

Table 1 and Table 2 list text and icon conventions that are used throughout this guide:

Table 1

Convention

Text represented as

screen display

Text represented as

commands

Keys

Italics

Table 2

Icon

Text Conventions

Notice Icons

Type Description

Information Note

Caution Cautions contain directions that you must follow to

Description

This typeface

on your terminal screen, for example:

NetLogin:

This typeface is used to represent commands that you

enter, for example:

SETDefault !0 -IP NETaddr = 0.0.0.0

When specific keys are referred to in the text, they are called out by their labels, such as “the Return key” or “the Escape key,” or they may be shown as [Return] or [Esc].

If two or more keys are to be pressed simultaneously, the keys are linked with a plus sign (+), for example:

Press [Ctrl]+[Alt]+[Del].

Italics

are used to denote

Information notes call attention to important features or instructions.

avoid immediate system damage or loss of data.

is used to represent displays that appear

new terms

emphasis

Warning Warnings contain directions that you must follow for

your personal safety. Follow all instructions carefully.

NTRODUCTION

The Integrated Services Digital Network (ISDN) is a digital communications standard for supporting voice, data, and video applications through conventional telephone wires.

Speciﬁcally, ISDN is a method of connecting to the public telephone network using digital technology. ISDN uses the existing copper wire and public telephone network infrastructure. All existing voice services provided by the telephone companies are accessible using ISDN, and for the ﬁrst time, high-speed dial-up data can be provided cost-effectively to the mass market.

Two electrical interfaces are deﬁned as part of ISDN. The ﬁrst and less expensive is Basic Rate ISDN, or 2B+D. A Basic Rate Interface (BRI) has two 56 or 64 Kbps (kilobits per second)

earer) channels for user data, and one 16 Kbps signaling

B (

ata) channel, used for packet communications with the

D ( public network and providing status and control information.

In most regions, the ISDN BRI is priced at 1.5 to 1.8 times the monthly cost of an analog POTS (plain old telephone service) telephone line. You may dial voice or data connections on either or both of the B channels simultaneously. Calls placed from an ISDN line may connect to remote sites that have analog POTS, Switched 56, ISDN BRI, or T1 telephone lines. There is full compatibility with existing services, and no need for ISDN BRI on both ends.

The other electrical interface, which is somewhat more expensive, is the ISDN Primary Rate Interface (PRI). PRI is based on the more expensive and higher-speed T1 networks that are typically deployed at larger sites. PRI consists of 23 B channels and one 64 Kbps D channel, providing large businesses with a greater degree of ﬂexibility.

1-2

HAPTER

NTRODUCTION

1: I

The 3Com Impact ISDN External Digital Modem (referred to as the 3Com Impact digital modem throughout this guide) is an external, stand-alone ISDN Basic Rate digital modem for connection with digital telephone services from local telephone companies in North America. It is designed for users who require high-speed access to the Internet, on-line information services, or their corporate local area network (LAN). A typical 3Com Impact digital modem application is shown in Figure 1-1.

3Com Impact ISDN External

D-Channel B-1

B-2

™

Impact

Com

Digital Modem

Power Test

Internet

on-line service

ISDN line

Public telephone

network

Analog or ISDN line

Corporate

LAN

Figure 1-1

Analog and Digital Network Access with the 3Com Impact

Digital Modem

Four models of the 3Com Impact digital modem are sold in the U.S. and Canada:

3C871 is the IBM

■

or IBM-compatible PC external digital

modem product.

3C872 is the IBM or IBM-compatible PC external digital

■

modem product with an internal 14.4 Kbps analog fax modem.

3C876 is the Appleâ Macintoshâ external digital modem

■

product.

3C877 is the Apple Macintosh external digital modem

■

product with an internal 14.4 Kbps analog fax modem.

3Com Impact Digital Modem Features

The 3Com Impact digital modem can be connected to any

compatible UL

-listed IBM ATâ-compatible or Apple Macintosh personal computer that includes instructions for the installation of hardware and software options to serial ports.

3Com Impact Digital Modem Features

The 3Com Impact digital modem provides the following:

■

A complete digital network termination (Basic Rate ISDN NT1).

■

Full ISDN signaling support of National ISDN and pre-National ISDN service offerings.

An asynchronous RS-232-C data port for connectivity to IBM

■

or compatible PC and Apple Macintosh serial ports at rates of up to 115.2 Kbps.

■

AT command set dialing.

■

Interoperability support through standard protocols like Point-to-Point Protocol (PPP) and V.120. (V.120 is a rate adaption scheme to convert transmission rates from a range of 50 bps to 19.2 Kbps to the B channel 64 Kbps rate.)

1-3

■

Multilink PPP support, which allows the two B channels to be virtually linked, thereby allowing a maximum digital connection of 128 Kbps.

■

Dynamic bandwidth allocation (DBA), which allows you to place a voice call while a Multilink PPP call is active.

■

Internal 14.4 Kbps analog fax modem (V.32

bis

compliant) for connection to non-ISDN fax machines and modems (applies to 3C872 and 3C877 models only).

An analog voice port for attaching analog telephones,

■

answering devices, and fax machines to the ISDN line.

■

A graphical user interface for digital modem conﬁguration.

■ A comprehensive diagnostic test and LED status display.

■ One-year limited warranty within the “Other Hardware

Products” category of the 3Com Limited Warranty at the end of this guide.

1-4 CHAPTER 1: INTRODUCTION

Data Capabilities

The 3Com Impact digital modem allows transmission of asynchronous data at speeds of up to 115.2 Kbps over digital ISDN connections with the highest reliability and error-free performance possible. With Multilink PPP, a digital connection of up to 128 Kbps can be established by aggregating the two 56 Kbps or 64 Kbps ISDN B channels. Note that the COM port speed of your PC limits the maximum data transmission rate to no more than 115.2 Kbps.

ISDN technology reduces call setup times by more than 50% compared to V. fast/V.34 analog modem setup times, reducing the time it takes to establish a connection to under three seconds.

This high-speed performance allows you to do the following:

■ Dial up the Internet at high data rates

■ Access your ofﬁce’s LAN

■ Access and download graphics, software, and data ﬁles more

quickly

Voice Capabilities

The 3Com Impact digital modem’s Phone Out port allows the use of existing analog telephone equipment (touch-tone telephones, cordless telephones, and fax and answering machines) to place and receive calls over the ISDN line. When you connect to another ISDN line, setup times are reduced, and voice quality is excellent.

Simultaneous Data and Voice Capabilities

The 3Com Impact digital modem quickly processes data and voice calls simultaneously. For example, you can send a fax or place a voice telephone call while maintaining a high-speed connection to the ofﬁce LAN; you can also receive a voice telephone call while you are connected to the Internet.

3Com Impact Digital Modem Package Contents 1-5

Analog Modem Capabilities

The 3Com Impact digital modem (models 3C872 and 3C877) includes an integrated V.32bis analog modem for data or fax transmissions of up to 14.4 Kbps over the ISDN line. V.42bis data compression boosts analog modem throughput to up to 57.6 Kbps.

3Com Impact Digital Modem Package Contents

3Com Impact digital modems are available in Macintosh and PC versions, with or without a built-in V.32bis analog fax modem.

Standard Package Contents

The following list describes the package contents common to models 3C871, 3C872, 3C876, and 3C877. Refer to the section “Additional Contents” for any additional items that are speciﬁc to a particular model.

■ One 3Com Impact ISDN digital modem

■ One power cable with an ac wall transformer

■ One serial cable

■ One RJ -45/RJ -11 ISDN telephone cable

■ One 3.5" installation diskette

■ 3Com Impact ISDN External Digital Modem User Guide

■ 3Com Impact ISDN External Digital Modem Quick Start

Instructions

Additional Contents

Model 3C871

■ One copy of TurboCom

■ One DB-9-to-DB-25 serial connection adapter

Windowsä software

1-6 CHAPTER 1: INTRODUCTION

Model 3C872

■ One copy of TurboCom Windows software

■ One copy of Delrina

WinCommä Lite and WinFaxâ Lite

communications software

■ One DB-9-to-DB-25 serial connection adapter

ISDN Digital Line Conﬁguration Requirements

The 3Com Impact digital modem requires an ISDN digital telephone line that is properly conﬁgured for use with the digital modem.

3Com has determined the optimal ISDN line conﬁgurations for the 3Com Impact digital modem and has provided that conﬁguration data to many telephone companies.

To simplify the ordering process for an ISDN digital line, use the following simpliﬁed ISDN ordering code:

3ComA * J6

If your digital modem has an internal analog fax modem (Models 3C872 and 3C877), then two directory numbers (telephone numbers) will be required to allow a voice call and a fax modem call to occur at the same time. When you tell the telephone company the ISDN ordering code (3ComA * J6), let the representative know that you will need two directory numbers.

If your telephone company does not support simpliﬁed ISDN ordering codes, refer to Table 1-1 for ISDN ordering information.

Present this ordering information to the ISDN line installer or telephone company service representative in your area. Also, make sure that your local telephone company installer provides an RJ-11 or RJ-45 connector for your ISDN line.

Computer System Requirements 1-7

Table 1-1 ISDN Ordering Information by Switch Type

ISDN Switch Type

Northern

ISDN Line Configuration Parameter

AT&Tâ 5ESS Custom

Line Code 2B1Q (no NT1

required)

Computer System Requirements

Connect the model 3C871 or 3C872 3Com Impact digital modem to an IBM-compatible computer. Connect the model 3C876 or 3C877 3Com Impact digital modem to an Apple Macintosh computer. Connect the digital modem to a computer that meets UL standards in the United States or is certiﬁed to CSA standards in Canada.

1-8 CHAPTER 1: INTRODUCTION

IBM PC or Compatible Requirements

An IBM-compatible PC must have the following:

■ A 386, 486, or Pentium

■ An available serial communications port

processor

For sustained performance at higher data rates (57.6 Kbps and 115.2 Kbps), it is recommended that your IBM or IBMcompatible PC serial COM port be equipped with a 16C550 UART (universal asynchronous receiver/transmitter). To determine what UART is installed in your PC, run the Microsoft

Diagnostic Program (msd) from the DOS prompt. In addition, for reliable high-speed serial port performance in the Microsoft Windows environment, a TurboCom Windows, which replaces the standard Microsoft Windows COM driver, is included with the 3Com Impact digital modem.

driver for

■ MS-DOS

■ 640 Kilobytes of conventional memory

■ Microsoft Windows 3.1 or later (optional)

■ A hard disk drive with 1 MB of free space

or IBM PC DOS 3.1 or later operating system

Apple Macintosh Requirements

An Apple Macintosh computer must be a Macintosh Plus or later model. It must also have the following:

■ An available serial communications port

The highest possible serial port data rate with most Macintosh computers is 57.6 Kbps. Some later Macintosh models (AV and Power Macintosh

115.2 Kbps. 3Com recommends that you use the 8-pin serial communications port on your Macintosh.

■ System 7 or later operating system

■ A hard disk drive with 1 MB of free space

) have data rates of up to

Cabling Requirements

Cables to connect the 3Com Impact digital modem to your computer are provided. For IBM or IBM-compatible PCs with a 25-pin serial port, a DB-9–to–DB-25 connection adapter is included with the digital modem.

The asynchronous RS-232-C port on the digital modem, labeled Computer, is a standard DB-9 female connector. The digital modem asynchronous port pin assignments, shown in Table 1-2, conform to standard deﬁnitions for data communications equipment (DCE).

Table 1-2 Pin Descriptions

Pin # Pin Name Signal Direction

1 Carrier Detect (DCD) From digital modem

2 Receive Data (RD) From digital modem

3 Transmit Data (TD) To digital modem

4 Data Terminal Ready

(DTR)

5 Signal Ground (GND) —

6 Data Set Ready (DSR) From digital modem

7 Request to Send (RTS) To digital modem

8 Clear to Send (CTS) From digital modem

9 Ring Indicator (RI) From digital modem

Cabling Requirements 1-9

To digital modem

INSTALLING AND

CONFIGURING

THE

This chapter describes installation and conﬁguration of the 3Com Impact digital modem. In combination with the instructions given in this chapter, follow the instructions given in the appropriate PC or Macintosh computer user guide. Refer to Figure 2-1 and Figure 2-2, showing the digital modem back and front panels, during installation and conﬁguration. If you encounter difﬁculties after installation, refer to Chapter 3, “Troubleshooting.”

Power 12V AC RS232D

Figure 2-1 Back Panel Power Switch and Connectors

DIGITAL MODEM

RS232D

Wall

ISDN BRI-U ONLY

The LED status display, shown in Figure 2-2, consists of ﬁve front panel LEDs that are described in Table 2-1.

D-Channel

Power

Test

B-1

3ComImpact

Figure 2-2 Front Panel LED Indicators

™

B-2

2-2 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM

Table 2-1 Front Panel LED Indicator Deﬁnitions

LED Color Description

Power Yellow Power Indicator. Lit when power is on and remains lit as long

Test Yellow Self-Test/Status. Flashes when the digital modem is

D-Channel Yellow D Channel/Status. Provides a quick indication of the ISDN

B-1 Yellow

or green

B-2 Yellow

or green

as power is available from the ac wall transformer plugged into the electrical outlet.

executing its power-up self-test or a user-initiated reset. If the results of the self-test or reset are normal, the LED goes off. If the result of the self-test is abnormal and a fault is detected, the LED remains lit but does not flash.

physical network interface and D channel status. If the physical ISDN interface is not synchronized or is disconnected, this LED remains lit.

If the physical interface establishes synchronization and the ISDN D channel signaling procedures are not properly established, the LED flashes.

Once the physical and D channel signaling are synchronized, the LED goes off.

If any physical loss of framing occurs, the LED lights; if there is a loss of D channel signaling, the LED flashes.

B-1 Channel Indicator. Indicates the activity state of the B-1 channel of the ISDN interface. Green indicates a circuit-switched data call. Yellow indicates a circuit-switched voice call. If a call is in a dialing state, the LED flashes. When a call enters the active state, the appropriate LED color stays lit. When the call is disconnected, the LED goes off.

B-2 Channel Indicator. Indicates the activity state of the B-2 channel of the ISDN interface. Green indicates a circuit-switched data call. Yellow indicates a circuit-switched voice call. If a call is in a dialing state, the LED flashes. When a call enters the active state, the appropriate LED color stays lit. When the call is disconnected, the LED goes off.

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