3Com DIGITAL MODEM A, T, G

A

BOUT

T

HIS

G

UIDE

Introduction

This guide describes how to install, operate, and

troubleshoot the 3Com

â

Impact

ä

ISDN External Digital

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.

If you are looking for: Turn to:

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

Appendix B

Information about 3Com’s technical support Appendix C

Contents

Main 3Com Corporation 95052-8145 Santa Clara, California 5400 Bayfront Plaza C ONTENTS 3 A C B F IGURES T ABLES A How to Use This Guide Introduction UIDE Conventions Table 1 and Table 2 list text and icon conventions that are used throughout this guide: I NTRODUCTION Page 3Com Impact Digital Modem Features Data Capabilities Voice Capabilities Simultaneous Data and Voice Capabilities Analog Modem Capabilities 3Com Impact Digital Modem Package Contents Standard Package Contents Additional Contents ISDN Digital Line Conguration Requirements Computer System Requirements IBM PC or Compatible Requirements Apple Macintosh Requirements Cabling Requirements 2 C THE DIGITAL MODEM Page Installing the 3Com Impact Digital Modem Installing the Digital Modem in an IBM-compatible PC Page Page Conguring the 3Com Impact Digital Modem Conguration for IBM PC or Compatible Computer Page Page Page Page Page Conguration for Apple Macintosh Computer Page Placing and Receiving Calls Placing ISDN Data Calls Multilink PPP Calls With Dynamic Bandwidth Allocation Page Placing Analog Modem Calls Using Communications Software to Place Calls Receiving Data Calls Using the Phone Out Port Placing Calls Using the Phone Out Port Receiving Calls Using the Phone Out Port Protocol Support Async-Sync PPP Conversion QuickSelect 3 Troubleshooting Tips Page Page Page Downloading Firmware to Your External Digital Modem Page A O Page B REGISTERS, AND RESULT C AT Command Set for the 3Com Impact Digital Modem Table B-1 summarizes the AT command set. Page Page AT Command Set for Internal Analog Fax Modem Table B-1 summarizes the AT command set for the internal analog modem. Page Page Remote S Registers Page Page Digital Modem Result Codes Table B-4 lists the 3Com Impact digital modem result codes. C On-line Technical Services 3Com Bulletin Board Service World Wide Web Site Ask3Com on CompuServe 3ComFacts Automated Fax Service Support from Your Network Supplier Support from 3Com Returning Products for Repair