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3COM IMPACT
®
ISDN EXTERNAL DIGITAL
MODEM USER GUIDE
A member of the 3Com Impact product family
Part No. 09-0699-002
Published August 1995
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3Com Corporation n 5400 Bayfront Plaza n Santa Clara, California n 95052-8145 Ó 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 pa
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CONTENTS ABOUT THIS GUIDE Introduction i How to Use This Guide i Conventions ii 1 INTRODUCTION 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 Require
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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 3 TROUBLESHOOTING Troubleshooting Tips 3-1 Downloading Firmware to Your External Digital Modem 3-5 A AT COMMAND SET OVERVIEW B AT COMMANDS, REGISTERS, AND RESULT CODES AT Command Set for the 3Com Impact Digital Modem B-1 AT Comma
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FIGURES 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
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TABLES 1 Text Conventions ii 2 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
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ABOUT THIS GUIDE Introduction This guide describes how to install, operate, and â ä troubleshoot the 3Com Impact 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. Ho
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ii ABOUT THIS GUIDE Conventions Table 1 and Table 2 list text and icon conventions that are used throughout this guide: Table 1 Text Conventions Convention Description Text represented as This typeface is used to represent displays that appear screen on your terminal screen, for example: display NetLogin: Text represented as This typeface is used to represent commands that you commands enter, for example: SETDefault !0 -IP NETaddr = 0.0.0.0 Keys When spe
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1 INTRODUCTION 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,
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Power Test D-Channel B-1 B-2 1-2 CHAPTER 1: INTRODUCTION 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 (LA
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3Com Impact Digital Modem Features 1-3 The 3Com Impact digital modem can be connected to any â â compatible UL -listed IBM AT -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: n A complete digital network termination (Basic Rate ISDN NT1). n Full ISDN signaling support of Nati
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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. ISD
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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 P
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1-6 CHAPTER 1: INTRODUCTION Model 3C872 n One copy of TurboCom Windows software â ä â n One copy of Delrina WinComm Lite and WinFax Lite communications software n 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 con
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Computer System Requirements 1-7 Table 1-1 ISDN Ordering Information by Switch Type ISDN Switch Type Northern â â Telecom Siemens ISDN Line AT&T 5ESS DMS100 EWSD â Configuration AT&T 5ESS National National National Parameter Custom ISDN-1 ISDN-1 ISDN-1 Line Code 2B1Q (no NT1 2B1Q (no NT1 2B1Q (no NT1 2B1Q (no NT1 required) required) required) required) * * * Directory 1 1 2 1 Numbers Channels 2B alternate 2B alternate 2B alternate 2B alternate circuit-switched circuit-switched circuit-s
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1-8 CHAPTER 1: INTRODUCTION IBM PC or Compatible Requirements An IBM-compatible PC must have the following: â n A 386, 486, or Pentium processor n An available serial communications port For sustained performance at higher data rates (57.6 Kbps and 115.2 Kbps), it is recommended that your IBM or IBM- compatible 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 â Microsoft Diagnostic Progra
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Cabling Requirements 1-9 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 equi
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Power Test D-Channel B-1 B-2 INSTALLING AND 2 CONFIGURING THE DIGITAL MODEM 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 Ch
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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 as power is available from the ac wall transformer plugged into the electrical outlet. Test Yellow Self-Test/Status. Flashes when the digital modem is 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
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Installing the 3Com Impact Digital Modem 2-3 Installing the 3Com Impact Digital Modem This installation procedure assumes that you are familiar with IBM and IBM-compatible or Apple Macintosh computers. If you are not, refer to the user guide that accompanied your computer for instructions on hardware installation and operating system commands. Installing the Digital Modem in an IBM-compatible PC To install the 3Com Impact digital modem model 3C870 or 3C872 in an IBM or IBM-compatible compu
