3Com DIGITAL MODEM manual Introduction

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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 (LAN). A typical 3Com Impact digital modem application is shown in Figure 1-1.

3Com Impact

ISDN External

Digital Modem

3ComImpact

ISDN line

Public telephone

network

Analog or ISDN line

Internet

or

on-line service

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 IBMâ 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.

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Contents Isdn External Digital Modem User Guide Member of the 3Com Impact product family3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents QuickSelect Support from 3Com C-4 Returning Products for Repair C-4Figures Tables About this Guide How to Use This GuideIntroduction Conventions Introduction Introduction 3Com Impact Digital Modem Features 3Com Impact digital modem provides the followingVoice Capabilities Data CapabilitiesSimultaneous Data and Voice Capabilities 3Com Impact Digital Modem Package Contents Isdn Digital Line Configuration Requirements 3ComA * J6Ewsd Computer System RequirementsAT&T 5ESS ISDN-1IBM PC or Compatible Requirements Apple Macintosh RequirementsCabling Requirements Signal Ground GNDClear to Send CTS From digital modem Ring Indicator RI DTRInstalling Configuring Digital Modem Back Panel Power Switch and ConnectorsLED Installing the 3Com Impact Digital Modem Installing the Digital Modem in an IBM-compatible PCInstalling the Digital Modem in an Apple Macintosh Computer Installing the 3Com Impact Digital Modem Configuring the 3Com Impact Digital Modem Select Run from the File menu. In the Run dialog box, type Configuration for IBM PC or Compatible ComputerCOM port to which the digital modem is connected Installing and Configuring the Digital Modem Registers Installing and Configuring the Digital Modem Install Installing and Configuring the Digital Modem Configuration for Apple Macintosh Computer Installing and Configuring the Digital Modem Placing Isdn Data Calls Placing and Receiving CallsMultilink PPP Calls With Dynamic Bandwidth Allocation Installing and Configuring the Digital Modem Incoming circuit-switched data calls from other Using the Phone Out PortUsing Communications Software to Place Calls Placing Analog Modem CallsPlacing Calls Using the Phone Out Port Receiving Calls Using the Phone Out PortAsync-Sync PPP Conversion T1 access linesProtocol Support QuickSelectTroubleshooting Troubleshooting TipsTroubleshooting Monitor the B-1 and B-2 LEDs Troubleshooting Click the Tools button Firmware and Tests buttons appear If problems persist, refer to Appendix C,Technical SupportDownloading Firmware to Your External Digital Modem Click the Firmware button Firmware dialog box appearsClick OK Overview AT Command SETAT gets the attention of your 3Com Impact digital modem Type AT Command Set for the 3Com Impact Digital Modem AT Commands REGISTERS, and Result CodesTable B-1 summarizes the AT command set SN? SN=\T0 disables inactivity timer default Settings AT \SCommands Initial configuration setAT Command Set for Internal Analog Fax Modem ATC1Non-error corrected mode only Results of commandsReceived line signal level Flow control Enable MNP mode Stream default BlockEnable inhibits MNP extended Mode to be negotiated in a DirectMNP extended services Answer mode detection phaseRemote S Registers Isdn PPP Magic-Number Block Service providerS83 Digital Modem Result Codes Table B-4 lists the 3Com Impact digital modem result codesOn-line Technical Services 3Com Bulletin Board ServiceAsk3Com on CompuServe 3ComFacts Automated Fax ServiceWorld Wide Web Site To use Ask3Com Log on to CompuServeCountry Fax Number Italy 1678 Support from Your Network SupplierCountry Fax Number Hong Kong 852 537 Norway 800 Sweden 020 0800To obtain an RMA number, call or fax Support from 3ComReturning Products for Repair Country Telephone Number Fax NumberLimited Warranty 3Com Corporation Bayfront Plaza Interference Handbook Canadian Notice

DIGITAL MODEM specifications

The 3Com Digital Modem represents a significant advancement in communication technology, designed to enhance data transmission over telephone lines. This modem is a part of a lineage of 3Com products that focus on delivering robust networking solutions, tailored for both personal and professional use.

One of the main features of the 3Com Digital Modem is its high-speed data transfer capabilities. With speeds reaching up to 56 Kbps, it allows users to send and receive large amounts of data quickly, which is essential for applications that require efficient data exchange. This speed ensures smoother internet browsing, quicker downloads, and more reliable connections for applications such as video conferencing and online gaming.

The modem is equipped with advanced error correction technologies, including V.42 and V.42bis protocols. These protocols help to maintain data integrity by detecting and correcting errors during transmission. This results in a more reliable connection, reducing the likelihood of dropped calls or corrupted data transfers, which can be particularly frustrating for users engaged in critical business communications.

Another notable characteristic of the 3Com Digital Modem is its compatibility with various operating systems, making it versatile for different users. It supports Windows, Mac, and various other platforms, ensuring that it can be integrated seamlessly into existing systems without the need for extensive configuration. This plug-and-play capability simplifies installation for users, allowing them to get connected quickly and efficiently.

The modem also incorporates an innovative design that facilitates improved heat dissipation, ensuring optimal performance during prolonged use. Its compact form factor makes it suitable for both home and office environments, allowing for easy setup without consuming excessive desk space.

In addition to these features, the 3Com Digital Modem boasts strong security protocols, ensuring that users' data is protected against unauthorized access while being transmitted. This is particularly important in today’s digital landscape, where data breaches and cyber threats are prevalent.

Overall, the 3Com Digital Modem combines speed, reliability, and security, making it a valuable asset for anyone looking to enhance their connectivity experience. Its robust feature set and user-friendly design cater to a broad audience, from casual users to business professionals, reflecting the evolution of modem technology in a digital-first world.
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