3Com 3C882 User Manual

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XTERNAL

SER

MPACT

UIDE

ISDN M



ODEM

Part No. 09-0885-000 Published July 1996



3Com Corporation

5400 Bayfront Plaza

■

Santa Clara, California

■

95052-8145

■

3Com Corporation, 1996. All rights reserved. No par t 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: Use, duplication or disclosure by the Government is subject to restrictions

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 Unpublished rights reserved under the copyright laws of the United States.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. 3ComImpact, Async-Sync PPP, SPID Wizard and QuickSelect are trademarks of 3Com Corporation.

CompuServe is a registered trademark of CompuServe, Inc. IBM and AT are trademarks of International Business Machines Corporation. Apple and 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, Windows, and Windows NT are trademarks of Microsoft Corporation. Siemens is a trademark of Siemens Artiengesellschaft. AT&T is a trademark of American Telephone & Telegraph Company. Northern Telecom is a trademark of Northern Telecom Limited. Motorola is a trademark of Motorola, Inc. Stac is a trademark of State of the Art Consulting, Inc. Hayes is a trademark of Hayes Microcomputer Products, Inc. AdTran is a trademark of AdTran Inc.

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.

5 Y L

The warranty for the 3ComImpact™ IQ External ISDN Modem is as stated in the Limited Warranty statement found at the back of this User Guide with the exception that the 3ComImpact IQ External ISDN modem has a 5 Year limited warranty on the hardware in lieu of the standard 1 year warranty.

The software for the 3ComImpact IQ External ISDN Modem has a 90 day warranty as further speciﬁed in the Limited Warranty statement.

To ensure the ver y best 3Com service and support, take the time to register on-line or complete the product registration card.

EAR

IMITED

ARRANTY

ONTENTS

BOUT

HIS

UIDE

Introduction 1 How to Use This Guide 1 Conventions 2

NTRODUCTION

3C882 ISDN Modem Features 1-2

Easy Installation and Use 1-2 High Performance 1-3 Protocols 1-3 ISDN Standards and Interface 1-3 Security 1-4 Voice Features 1-4 Upgradability 1-4 Diagnostics 1-4

Warranty 1-4 3C882 ISDN Modem Package Contents 1-5 Before You Install the 3C882 ISDN Modem 1-5

IBM PC or Compatible Requirements 1-6

Apple Macintosh Requirements 1-6

ISDN Information 1-7

NSTALLING

Familiarizing Yourself with the 3C882 ISDN Modem 2-2 Installing a Serial Cable 2-4 Installing the ISDN Cable 2-5 Installing Analog Equipment 2-6 Installing the Power Cable 2-8

3C882 ISDN M

THE

ODEM

ONFIGURATION

Conﬁguring the 3C882 ISDN Modem for a PC 3-1

Installing the 3C882 Software 3-2 Running SPID Wizard 3-3 Conﬁguring Multilink PPP 3-8 Conﬁguring the B Channel Rate 3-9 Conﬁguring Voice Call Routing 3-9

Verifying the Conﬁguration 3-11 Setup Using Windows 95 3-13 Setup Using Windows NT RAS 3-17

FOR

IBM-C

OMPATIBLE

ONFIGURATION

C C

OMPUTER

Conﬁguring the 3C882 ISDN Modem for a Macintosh Computer 4-1

Installing the 3C882 Software 4-2

Running SPID Wizard 4-4

Conﬁguring Multilink PPP 4-9

Conﬁguring the B Channel Rate 4-10

Conﬁguring Voice Call Routing 4-10

Verifying the Conﬁguration 4-12

DVANCED

Advanced Conﬁguration Parameter Default Values 5-1 Changing The Parameter Settings 5-4

LACING

Placing ISDN Data Calls 6-1

Placing a 56K TollSaver Call 6-4 Receiving ISDN Data Calls 6-5 Placing Voice Calls Using an Analog Phone Port 6-6 Receiving Voice Calls Using an Analog Phone Port 6-6

AND

Placing Calls Automatically 6-2

Placing Calls Manually 6-2

Placing Multilink PPP Calls 6-3

FOR

ONFIGURATION

ECEIVING

PPLE

ALLS

ACINTOSH

ROUBLESHOOTING

Checking the Basics 7-1 Monitoring LEDs 7-2

Monitoring the TEST LED 7-2 Monitoring the D Channel LED 7-2

Monitoring the B Channel LEDs 7-3 Evaluating Symptoms and Solutions 7-3 Using On-Line Help 7-5 Finding More Information 7-5 Contacting Technical Support 7-5 Downloading Firmware to Your 3C882 ISDN Modem 7-5

RDERING

Placing the ISDN Order Through 3Com A-1 Placing the ISDN Order Through Your Telephone Company A-1

AT&T 5ESS Switch NI1 A-3

AT&T 5ESS Custom Switch A-4

NorthernTelecomDMS 100 Switch A-5

Siemens EWSD Switch A-6

AT C S R

EGISTERS

AT Command Set B-1 S Registers B-4 Result Codes B-8

PECIFICATIONS

3C882 ISDN Modem Speciﬁcations C-1 RS-232 COM Port Pin Speciﬁcations C-2 PC Serial Cable Pin Speciﬁcations C-3 Macintosh Serial Cable Pin Speciﬁcations C-3

ONFIGURATION

Conﬁguration Using DOS D-1

ISDN S

OMMANDS

AND

ERVICE

SING

ESULT

DOS

ODES

ECHNICAL

On-line Technical Services E-1

3Com Bulletin Board Service E-1 World Wide Web Site E-2 3ComForum on CompuServe E-3

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

UPPORT

LOSSARY

NDEX

IMITED

FCC C

ANADIAN

LASS

ARRANTY

SER

B C

ERTIFICATION

OTICE

OFTWARE

ICENSE

TATEMENT

GREEMENT

IGURES

1-1 Network Access with the 3C882 ISDN Modem 1-1 1-2 ISDN Information Sheet 1-7

2-1 Installation Steps for the 3C882 ISDN Modem 2-1 2-2 Front Panel LED Indicators 2-2 2-3 Back Panel Connectors 2-2 2-4 Computer to 3C882 ISDN Modem COM Port Connection 2-4 2-5 ISDN Cable Connection 2-5 2-6 Analog Equipment Connection 2-6 2-7 Power Cable Connection 2-8

3-1 Main 3C882 Conﬁguration Steps for a PC 3-1 3-2 Run Dialog Box 3-2 3-3 3ComImpact IQ Globe Icon 3-3 3-4 SPID Wizard Start Message for PC 3-3 3-5 First Telephone Number Dialog Box for PC 3-4 3-6 Second Telephone Number Dialog Box for PC 3-5 3-7 Successful Conﬁguration Dialog Box 3-5 3-8 Conﬁguration Dialog Box for PC 3-6

3-9 Voice Call Routing Default Setting 3-9 3-10 Conﬁguration for One Telephone Number per Device 3-10 3-11 Conﬁguration for One Telephone Number & Two Devices 3-11 3-12 New Hardware Dialog Box 3-13 3-13 Install From Disk Dialog Box 3-14 3-14 Select Device Dialog Box 3-14 3-15 Install New Modems Dialog Box 3-15 3-16 Modem Manufacturers and Models Dialog Box 3-16 3-17 Network Settings Dialog Box 3-18 3-18 Remote Access Setup Dialog Box 3-18

4-1 Main 3C882 Conﬁguration Steps for a Macintosh 4-1 4-2 3ComImpact IQ Installer Icon 4-2 4-3 Installation Conﬁrmation Message Box 4-2 4-4 Software Installation Location Dialog Box 4-3 4-5 Successful Installation Message Box 4-3 4-6 3ComImpact IQ Program Icon 4-4 4-7 Select Modem Port Screen 4-4 4-8 SPID Wizard Start Screen 4-5

4-9 Switch Detection Status Screen for Macintosh 4-6 4-10 First Telephone Number Screen for Macintosh 4-6 4-11 Second Telephone Screen for Macintosh 4-7 4-12 Successful Conﬁguration Screen 4-8 4-13 Conﬁguration Dialog Box for Macintosh 4-8 4-14 Voice Call Routing Default Setting 4-10 4-15 Conﬁguration for One Telephone Number per Device 4-11 4-16 Conﬁguration for One Telephone Number & Two Devices 4-11

TABLES

1 Text Conventions 2 2 Notice Icons 2

2-1 Front Panel LED Indicator Deﬁnitions 2-3

5-1 Changing Default Settings 5-5

7-1 Symptoms, Causes, and Solutions 7-3

A-1 ISDN Order Codes A-2 A-2 Line Conﬁguration for AT&T 5ESS NI1 A-3 A-3 Line Conﬁguration for AT&T 5ESS Custom A-4 A-4 Line Conﬁguration for DMS 100 A-5 A-5 Line Conﬁguration for Siemens EWSD A-6

B-1 AT Command Set Summary B-1 B-2 S Registers B-4 B-3 3C882 ISDN Modem Result Codes B-8

C-1 Pin Descriptions C-2 C-2 PC COM Port Cable Pin Assignments C-3 C-3 Macintosh COM Port Cable Pin Assignments C-3

ABOUT THIS GUIDE

Introduction

This guide describes how to install, operate, and



troubleshoot the 3ComImpact referred to throughout this guide as the 3C882 ISDN modem.

Be sure to read the README.TXT or readme 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 Chapter 1 Instructions for installation Chapter 2 Instructions for configuration for an IBM or compatible PC Chapter 3 Instructions for configuration for a Macintosh computer Chapter 4 Advanced configuration Chapter 5 Instructions for placing and receiving data and voice calls Chapter 6 Troubleshooting tips Chapter 7 Instructions for ordering ISDN service Appendix A Tabular summary of the AT command line set, S registers,

and result codes 3C882 ISDN modem specifications Appendix C Instructions for configuration using DOS Appendix D Information about technical support from 3Com

IQ External ISDN Modem,

Appendix B



Appendix E

Conventions 2

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

screen display

Text represented as

commands

Keys When specific keys are referred to in the text, they are called out

Italics Italics are used to denote new terms or emphasis.

This typeface is used to represent displays that appear 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

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].

Table 2 Notice Icons

Icon Type Description

Information Note Information notes call attention to important features

Caution Cautions contain directions that you must follow to

Warning Warnings contain directions that you must follow for

or instructions.

avoid immediate system damage or loss of data.

your personal safety. Follow all instructions carefully.

INTRODUCTION

The 3ComImpac t IQ External ISDN Modem (referred to as the 3C882 ISDN modem throughout this guide) is an external, stand-alone Integrated Services Digital Network (ISDN) Basic Rate ISDN modem for connection with digital telephone services from local telephone companies in North America.



One model (3C882) supports both IBM



PCs and Apple

Macintosh computers.

The 3C882 ISDN modem is designed for users who require high-speed access to the Internet, Intranet, on-line information services, or corporate local area networks (LAN). A typical 3C882 ISDN modem application is shown in Figure 1-1.

or IBM-compatible

3ComImpact IQ External ISDN Modem

3Com

PWRTEST D B1 B2 SD RD DTR

ISDN line

m o

C 3

Impact

Public telephone

network

Internet/Intranet

on-line service

Figure 1-1 Network Access with the 3C882 ISDN Modem

Corporate

LAN

3C882 ISDN Modem Features 1-2

The 3C882 ISDN modem allows transmission of data at speeds of up to 128 Kbps over digital ISDN connections with the highest reliability and error-free performance possible.



With Stac

compression and a high-speed serial port, the 3C882 ISDN modem allows you to get transmission speeds of up to 230.4 Kbps. ISDN technology reduces call setup times by more than 50% compared to V. fast/V.34 analog modem setup times; connection is established in 3 seconds.

Setting up the 3C882 ISDN modem takes only 15 minutes. Simply connect the cables, load the software, run the SPID Wizard™ and then you are ready to place a call.

The 3C882 ISDN 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 send or receive a voice telephone call while you are connected to the Internet.

The 3C882 ISDN modem can be connected to any



compatible UL

-listed computer that includes

RS-232-compliant serial ports.

3C882 ISDN Modem Features

The 3C882 ISDN modem provides the following features.

Easy Installation and Use

■ SPID Wizard feature for automatic telephone company switch

and service proﬁle ID (SPID) number conﬁguration

■ Single screen, point and click user inter face for conﬁguration

■ Autobaud feature for automatic baud rate detection of your

computer’s COM por t

■ QuickSelect

required protocol, either V.120 or PPP, for each data call

■ Automatic conﬁguration veriﬁcation with on-line registration

■ On-line Help



protocol detection that automatically senses the

High Performance

■ Stac compression, for data throughput of up to 230.4 Kbps,

which conforms to these IETF drafts: The PPP Compression Control Protocol, March 1994, and PPP Stacker LZS Compression Protocol, February 1996

■ An asynchronous RS-232-D data port for connectivity to IBM

or compatible PC and Apple Macintosh serial ports at rates of up to 230.4 Kbps

■ Multilink PPP (RFC 1717), which creates a single digital

network connection of up to 128 Kbps

■ 56K TollSaver, which places a data call over a voice

connection saving you the additional charge for a data call

Protocols

■ ANSI V.120 rate adaption

■ Async-Sync PPP™ feature, which automatically converts

asynchronous PPP into synchronous (HDLC-based) PPP ISDN

3C882 ISDN Modem Features 1-3

■ IETF PPP (RFC 1661)

■ IETF Multilink PPP

■ ISDN Caller ID

ISDN Standards and Interface

■ A complete digital network termination (Basic Rate

ISDN U interface with built in NT1)

■ Full ISDN signaling support of National ISDN

■ Compatible with AT&T, Northern Telecom and Siemens

switches

Security

■ Password Authentication Protocol (PAP) and Challenge

Handshake Authentication Protocol (CHAP) support on both single-channel and Multilink PPP calls (IETF RFC 1334)

Voice Features

■ Dynamic bandwidth allocation (DBA), which allows you to

place or receive a voice call while a Multilink PPP call is active

■ Two analog voice ports for attaching analog telephone

equipment (touch-tone or cordless telephones, fax and answering machines, and analog modems) to the ISDN line

■ Flexible call routing to the two analog ports

Upgradability

■ Flash memory for ﬁeld ﬁrmware updates

■ Firmware posted on 3Com’s ftp and BBS sites

3C882 ISDN Modem Features 1-4

Diagnostics

■ LED status display

■ Test call compatibility

Warranty

■ 5-year limited warranty

3C882 ISDN Modem Package Contents 1-5

3C882 ISDN Modem Package Contents

The 3C882 ISDN modem package contents contains one each:

■ 3ComImpact IQ External ISDN Modem

■ Power cable with an AC wall transformer

■ RJ-45/RJ-11 ISDN telephone cable

■ 3.5-inch installation diskette for PCs running Windows® 95,

Windows NT®, Windows 3.x, or DOS

■ 3.5-inch installation diskette for Macintosh computers

■ 3ComImpact IQ External ISDN Modem User Guide

■ 3Com Impact IQ External ISDN Modem Quick Start Instructions

Before You Install the 3C882 ISDN Modem

To install and use the 3C882 ISDN modem successfully, you must have the following:

■ Correct ISDN service installed at your location with an

available ISDN RJ-11 outlet. If you have not ordered ISDN service yet, see Appendix A.

■ ISDN conﬁguration information. Fill out the ISDN Information

Sheet in the “ISDN Information” section of this chapter.

■ A computer that meets UL standards in the United States or

is certiﬁed to CSA standards in Canada. Refer to the section “IBM PC or Compatible Requirements” for an IBM or IBM-compatible PC. Refer to the section “Apple Macintosh Requirements” for an Apple Macintosh computer.

■ For Macintosh users, one 25-pin male to mini DIN 8-pin male

serial cable.

To order a free Macintosh serial cable, refer to the information enclosed in your 3C882 ISDN modem package. If you are supplying your own serial cable, ensure that it meets the pin speciﬁcations provided in Appendix C.

Before You Install the 3C882 ISDN Modem 1-6

IBM PC or Compatible Requirements

An IBM-compatible PC must have the following:

■ A 386, 486, or Pentium

■ Microsoft Windows 95, Windows NT, or Windows 3.x,



MS-DOS

■ 640 KB of conventional memory

■ A hard disk drive with 2 MB of free space

■ A high-density 3.5-inch ﬂoppy diskette drive

■ VGA or compatible video graphics adapter and monitor

, or IBM PC DOS 3.x



processor

(color recommended)

■ An available serial communications port

For 230.4 Kbps data rate. You will need an enhanced serial port card and COM port driver software which support 230.4 Kbps.

For 115.2 Kbps data rate. 3Com recommends 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 Microsoft

Diagnostic Program (msd) from

the DOS prompt.

Apple Macintosh Requirements

An Apple Macintosh computer must have the following:

■ An available serial communications port

■ System 7 or later operating system

■ A hard disk drive with 2 MB of free space

■ A high-density 3.5-inch ﬂoppy diskette drive

ISDN Information

Enter your ISDN telephone number(s) in the information sheet shown in Figure 1-2. You will need this information during conﬁguration of the 3C882 ISDN modem.

Although the 3C882 ISDN modem automatically conﬁgures the ISDN switch type and Service Proﬁle Identiﬁer (SPID) number(s), you should indicate the switch type and SPID(s), if any were assigned. You may need to refer to this information for technical support.

If necessary, ask your telephone company ISDN representative for the ISDN information.

Before You Install the 3C882 ISDN Modem 1-7

ISDN Information Sheet

3ComImpact IQ ISDN Modem

ISDN Switch Type

AT&T 5ESS NI1 ❒ AT&T 5ESS Custom ❒ Northern Telecom DMS 100 ❒ Siemens EWSD

❒

Number of Telephone Numbers (1 or 2) ______ Phone #1______________________________ SPID # for Phone #1______________________ Phone #2______________________________ SPID # for Phone #2______________________

Figure 1-2 ISDN Information Sheet

Before You Install the 3C882 ISDN Modem 1-8

ISDN Switch Type. Place a check mark next to the ISDN switch your telephone company uses. Each switch type has a corresponding provisioning table in Appendix A.

Number of ISDN Telephone Numbers. Your one ISDN telephone line can support two ISDN telephone numbers. If you ordered one ISDN telephone number, write 1. If you ordered two ISDN telephone numbers, write 2.

ISDN Telephone Number 1. Write down your ISDN telephone number provided to you by the telephone company ISDN representative.

ISDN Telephone Number 2. Write the second ISDN phone number if you ordered two ISDN telephone numbers for your line.

SPID Number. If required by your telephone company, ﬁll in the SPID number for each ISDN phone number. Your telephone company can tell you whether a SPID is required. This number is supplied to you by the telephone company.

INSTALLING THE 3C882

ISDN MODEM

This chapter describes how to install the 3C882 ISDN modem for use with an IBM or IBM-compatible PC or an Apple Macintosh computer.

This installation procedure assumes that you are familiar with your Apple Macintosh or IBM-compatible computer. If you are not, refer to the user guide that accompanied your computer for instructions on hardware installation and operating system commands.

The main hardware installation steps are depicted in Figure 2-1.

Familiarize yourself

with the

3C882 ISDN modem

Install serial cable

Install ISDN cable

Install analog

equipment

(optional)

Install power cable

Figure 2-1 Installation Steps for the 3C882 ISDN Modem

Familiarizing Yourself with the 3C882 ISDN Modem 2-2

Familiarizing Yourself with the 3C882 ISDN Modem

You should familiarize yourself with the components of the front panel and back panel of the 3C882 ISDN modem prior to installation.

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

PWR TEST D B1 B2 SD RD DTR

Figure 2-2 Front Panel LED Indicators

Figure 2-3 shows the back panel.

9 VDC

.6A MAX

Figure 2-3 Back Panel Connectors

RESET

3Com

Impact IQ

RS-232 ISDN U

3 Com

Familiarizing Yourself with the 3C882 ISDN Modem 2-3

Table 2-1 Front Panel LED Indicator Deﬁnitions

LED Color Description

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

TEST Green Self-Test/Status. Flashes when the 3C882 ISDN modem is

D Green D Channel Status. Indicates the ISDN physical network

B1 Amber

or green

B2 Amber

or green

as power is supplied to the unit.

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.

interface and D channel status:

Goes off once the physical and D channel signaling are

synchronized.

Flashes if the physical interface establishes synchronization

and the ISDN D channel signaling procedures are not properly

established.

Remains lit if the physical ISDN interface is not synchronized or

is disconnected.

B1 Channel Activity. Green indicates a circuit-switched data

call in progress. Amber indicates a circuit-switched voice call in

progress. If a call is in a dialing state, the LED flashes. When the

call is disconnected, the LED goes off.

B2 Channel Activity. Green indicates a circuit-switched data

call in progress. Amber indicates a circuit-switched voice call in

progress. If a call is in a dialing state, the LED flashes. When the

call is disconnected, the LED goes off.

SD Green Send Data. Indicates that information is being transmitted

RD Green Receive Data. Indicates that information is being transmitted

DTR Green Data Terminal Ready. Indicates that communication

over the serial data port from the computer to the ISDN

modem.

over the serial data port to the computer from the ISDN

modem.

between the ISDN modem and computer has been

established.

Installing a Serial Cable

You will need the following type of serial cable.

■ For a Macintosh computer, you will need a 25-pin male to

mini DIN 8-pin male serial cable. Refer to the information enclosed in your 3C882 ISDN modem package to order a free cable. If you are providing your own serial cable, ensure that it meets the pin speciﬁcations provided in Appendix C.

■ For a PC, you will need the 25-pin male to 9-pin female serial

cable that was provided. For PCs with a 25-pin serial port connector, you will need to purchase a standard 9-pin to 25-pin adapter.

To install the 3C882 ISDN modem serial cable:

1 Insert the 25-pin male end of a serial signal cable into the

RS-232 serial port on the 3C882 ISDN modem’s back panel and tighten the connector screws, as shown in Figure 2-4.

Installing a Serial Cable 2-4

ISDN U

RS-232

RESET

9 VDC

.5A MAX

Figure 2-4 Computer to 3C882 ISDN Modem COM Port Connection

2 Connect the other end of a serial cable to a serial COM

port on the back of your computer and tighten the connector screws.

On a PC, most COM port connectors are labeled COM, SERIAL, or RS-232-D. On an IBM AT® PC and most laptops or notebooks, connect the cable to a 9-pin COM port connector. If your PC has a 25-pin serial port connector, you will need to install a standard 9-pin to 25-pin adapter.

On a Macintosh computer, the COM port is the mini DIN 8-pin serial connector depicted by the telephone handset.

Installing the ISDN Cable

To install the ISDN cable:

1 Connect the RJ-45 (8-pin) connector end of the

RJ-45/RJ-11 ISDN cable to the RJ-45 ISDN line port labeled ISDN U on the 3C882 ISDN modem’s back panel, as shown in Figure 2-5.

Installing the ISDN Cable 2-5

ISDN U

RS-232

RESET

9 VDC

. 5A MAX

Figure 2-5 ISDN Cable Connection

2 Connect the RJ-11 (6-pin) connector end of the

RJ-45/RJ-11 ISDN cable to the RJ-11 ISDN wall jack.

CAUTION:

An NT1 is built into the 3C882 ISDN modem. Never connect the 3C882 ISDN modem ISDN port to a standard analog telephone jack or to an external NT1 device. Make sure that it is connected directly to the ISDN jack.

Installing Analog Equipment

You can connect an analog touch-tone telephone, answering machine, fax machine, or external analog modem to the 3C882 ISDN modem.

You will need an RJ-11 to RJ-11 cable for each analog phone port connection.

To install an analog device:

1 Insert one RJ-11 connector to a phone port labeled with a

telephone icon on the back of the ISDN modem as shown in Figure 2-6.

Installing Analog Equipment 2-6

ISDN U

RS-232

RESET

9 VDC

.5A MAX

Figure 2-6 Analog Equipment Connection

2 Insert the other RJ-11 end into the appropriate RJ-11 port

on the analog device.

3 If you have another analog device to install, repeat steps 1

and 2.

Installing Analog Equipment 2-7

CAUTION: The 3C882 ISDN modem is designed to operate with

telephones that are compatible with the original AT&T

2500 touch-tone telephone standard. 3Com guarantees proper operation of up to three compatible touch-tone devices per analog phone port. The 3C882 ISDN modem is designed to provide power and ringing for these three devices on up to 200 feet of AWG 26 or heavier AWG wiring. Although the 3C882 ISDN modem may function satisfactorily at longer cable distances with more than two attached telephones, proper operation at longer cable distances is not guaranteed in all situations.

Specialized telephone equipment such as speaker phones that draw large amounts of power may not work on the 3C882 ISDN modem’s Phone port. Because these devices do not conform to the power speciﬁcation of the 2500 touch-tone telephone standard, their operation is not guaranteed.

Installing the Power Cable

To install the power cable:

1 Connect the 3C882 ISDN modem power cable to the

9 VDC power connector on the back panel of the ISDN modem, as shown in Figure 2-7.

RESET

9 VDC

.5A MAX

Installing the Power Cable 2-8

ISDN U

RS-232

Figure 2-7 Power Cable Connection

2 Plug the transformer end of the power cable into a surge-

protected standard 110 VAC wall outlet.

The indicator LEDs on the front panel (see Figure 2-2) ﬂash momentarily as the unit undergoes a power-up self-test diagnostic.

This completes the 3C882 ISDN modem installation. Go to the appropriate chapter to conﬁgure the 3C882 ISDN

modem, either Chapter 3, “Conﬁguration for an IBM-Compatible PC,”or Chapter 4, “Conﬁguration for an Apple Macintosh Computer.”

CONFIGURATION FOR AN IBM-COMPATIBLE PC

This chapter describes how to conﬁgure the 3C882 ISDN modem using the Windows operating system. Additional steps are required for Windows 95 and Windows NT users. The main topics are as follows:

■ Conﬁguring the 3C882 ISDN modem

■ Setup Using Windows 95

■ Setup Using Windows NT RAS

For instructions on using the DOS operating system, refer to Appendix D.

Conﬁguring the 3C882 ISDN Modem for a PC

The main steps are shown in Figure 3-1.

Install 3C882

software

Run

SPID Wizard

Configure

Multilink PPP,

B channel rate, &

voice call routing

Verify

configuration

Figure 3-1 Main 3C882 Conﬁguration Steps for a PC

Configuring the 3C882 ISDN Modem for a PC 3-2

Installing the 3C882 Software

To install the 3C882 ISDN modem software:

1 Insert the 3ComImpact IQ Windows & DOS Installation

Diagnostic Utilities diskette into an available ﬂoppy drive.

2 If you are using Windows 95, selec t Run from the Start

menu. If you are using Windows 3.x, select Run from the File menu. In the Run dialog box shown in Figure 3-2, t ype:

a:\setup

Figure 3-2 Run Dialog Box

3 Click OK.

After the conﬁguration program is copied to the hard disk., the readme ﬁle opens. Review the information and then close the ﬁle. A message conﬁrms installation is complete.

If you are running Windows 3.x, a message box appears and asks you whether you want to install a COM port enhancement driver for data transfer rates up to 115.2 Kbps. This driver will replace your existing COM por t driver.

Running SPID Wizard

The SPID Wizard automatically detects your telephone company’s switch type and conﬁgures the SPID(s).

You will need the ISDN telephone numbers from the ISDN Information Sheet you completed in Chapter 1.

1 Double-click the 3ComImpact IQ 3.0 icon shown in

Figure 3-3.

Figure 3-3 3ComImpact IQ Globe Icon

You will see a start message, as shown in Figure 3-4.

Configuring the 3C882 ISDN Modem for a PC 3-3

Figure 3-4 SPID Wizard Start Message for PC

If you do not want to run the SPID Wizard, click Cancel. The Conﬁguration dialog box appears (see Figure 3-8). S elect your ISDN switch type, and then enter the telephone number(s) and, if required, enter the corresponding SPID(s) for your ISDN line. Refer to the section “Conﬁguring Multilink PPP”.

Configuring the 3C882 ISDN Modem for a PC 3-4

The dialog box for the ﬁrst telephone number appears, as shown in Figure 3-5.

Figure 3-5 First Telephone Number Dialog Box for PC

2 Enter the ﬁrst telephone number for your ISDN line. 3 Click Next.

A message appears, indicating that the 3C882 ISDN modem is detecting the SPID for the ﬁrst telephone number.

After the SPID is conﬁgured, the dialog box shown in Figure 3-6 appears.

Configuring the 3C882 ISDN Modem for a PC 3-5

Figure 3-6 Second Telephone Number Dialog Box for PC

4 If you have a second telephone number for your ISDN line,

enter it, and then click Next. If not, leave the ﬁeld incomplete, and then click Done.

After successful conﬁguration of your switch type and SPID number(s), Figure 3-7 appears.

Figure 3-7 Successful Conﬁguration Dialog Box

Configuring the 3C882 ISDN Modem for a PC 3-6

5 Click Finish.

The on-line registration dialog box appears. Enter your information and then click Register Now.

After your information is received, the Conﬁguration dialog box appears, as shown in Figure 3-8.

Figure 3-8 Conﬁguration Dialog Box for PC

A message bar at the bottom of the dialog box provides status information about the 3C882 ISDN modem.

The Conﬁguration dialog box buttons do the following. Help. Click the Help button to access help for the

Conﬁguration dialog box. There is also comprehensive on-line help accessible from the 3ComImpact IQ ISDN modem program group box.

Configuring the 3C882 ISDN Modem for a PC 3-7

Tools. Clicking on the Tools button produces buttons for Firmware, Tests, Save and Restore.

■ Firmw a r e. Refer to the readme ﬁle for ﬁrmware download

instructions.

■ Tests. Use the Tests tool only under the direction of

technical support personnel.

■ Save. Pressing the Save button saves the current

Conﬁguration dialog box settings in a ﬁle you name. You can easily restore a previously saved ﬁle to the Conﬁguration dialog box.

■ Restore. Pressing the Restore button restores the

3ComImpact IQ ISDN modem to a previously saved conﬁguration ﬁle.

Update. Click the Update button to download the current conﬁguration parameters to your ISDN modem’s S registers. After you click the Update button, the name changes to Updated to indicate that the change was made.

Exit. Click Exit to leave the Conﬁguration dialog box.

Running SPID Wizard Again

The SPID Wizard automatically runs when you are conﬁguring the 3C882 ISDN modem for the ﬁrst time or if you connect the 3C882 ISDN modem to a different ISDN line. After the ISDN switch type, telephone number(s) and SPID(s) are conﬁgured, clicking on the 3ComImpact IQ globe icon causes the Conﬁguration dialog box to be displayed.

If you add a second telephone number to your ISDN line after you run SPID Wizard, you can use SPID Wizard to detect the SPID for your second telephone number.

Configuring the 3C882 ISDN Modem for a PC 3-8

To run the SPID Wizard for a second telephone number:

1 From the Conﬁguration dialog box, check the Enabled

box located in the Number 2 group box.

A message box appears and asks you to conﬁrm that you want to run SPID Wizard.

2 Click OK.

The Second Telephone Number dialog box appears.

3 Enter the second telephone number for your ISDN line

and then click Next.

Figure 3-7 appears.

4 Click Finish.

Conﬁguring Multilink PPP

Multilink PPP is a protocol which provides a method for combining multiple PPP connections. Multilink PPP combines the two ISDN B channels, creating a virtual single digital connection of up to 128 Kbps. Note that the destination you are dialing must also support Multilink PPP, or the dual-channel link will not occur and you will get a single B channel connection. By default, Multilink PPP is enabled.

To enable or disable Multilink PPP, do the following:

1 Click inside the Multilink check box in the PPP area to

clear it (disable) or check it (enable).

2 Click the Update button to download the change to your

3C882 ISDN modem’s S register.

Additional conﬁguration may be needed for Multilink PPP. For details refer to S registers 82 and 83 in Appendix B.

Configuring the 3C882 ISDN Modem for a PC 3-9

Conﬁguring the B Channel Rate

By default, the B Channel Rate is 56 Kbps. Check with your telephone company for the appropriate B Channel Rate.

To change the B Channel Rate, do the following:

1 Select the appropriate radio button, 56 Kbps or 64 Kbps. 2 Click the Update button to download the change to your

3C882 ISDN modem’s S register.

Conﬁguring Voice Call Routing

If you plan to use the 3C882 ISDN modem’s analog Phone ports, you may want to change the default setting. An example using the default setting is shown in Figure 3-9.

ISDN U

RS-232

RESET

9 VDC

• 5A MAX

Number 1

Route Voice Calls to: Phone Port 1 Phone Port 2

Number 2

Route Voice Calls to: Phone Port 1 Phone Port 2

Telephone Number:

Service Profile Identifier: (SPID)

Telephone Number:

Service Profile Identifier: (SPID)

9085551212

9085551213

015551212000

015551213000

908 555 1212 908 555 1213

Figure 3-9 Voice Call Routing Default Setting

By default, all Phone Port boxes are checked. This allows calls to and from both ISDN telephone numbers to ring both devices simultaneously.

You may want to exclusively assign a telephone number to a device. Instructions for conﬁguring two common scenarios is as follows.

Configuring the 3C882 ISDN Modem for a PC 3-10

One Telephone Number per Analog Device. If you have two telephone numbers and two analog devices, you may want one telephone number associated exclusively with just an analog telephone and the other telephone number associated with just a fax machine.

In this example, shown in Figure 3-10, calls to 908 555 1212 will only be routed to the telephone.

Number 1

ISDN U

RS-232

RESET

9 VDC

• 5A MAX

908 555 1212 908 555 1213

Telephone Number:

Service Profile Identifier: (SPID)

Route Voice Calls to: Phone Port 1 Phone Port 2

Number 2

Telephone Number:

Service Profile Identifier: (SPID)

Route Voice Calls to: Phone Port 1 Phone Port 2

9085551212

015551212000

9085551213

015551213000

Figure 3-10 Conﬁguration for One Telephone Number per Device

One Telephone Number and Two Analog Devices. If you have only one telephone number for your ISDN line and two analog devices, check the Phone Port 1 and Phone Port 2 boxes located in the Number 1 group box, as shown in Figure 3-11. Calls to that telephone number will ring both devices allowing you to answer a call using either one.

Note that while you are using the fax machine, for example, you cannot use the telephone to place or receive calls because your ISDN line has only one telephone number.

Configuring the 3C882 ISDN Modem for a PC 3-11

Number 1

ISDN U

RS-232

RESET

9 VDC

• 5A MAX

908 555 1212 908 555 1212

Telephone Number:

Service Profile Identifier: (SPID)

Route Voice Calls to: Phone Port 1 Phone Port 2

Number 2

Telephone Number:

Service Profile Identifier: (SPID)

Route Voice Calls to: Phone Port 1 Phone Port 2

9085551212

015551212000

Figure 3-11 Conﬁguration for One Telephone Number & Two Devices

To change the voice call routing setting:

1 Specify which Phone port should handle the calls

associated with Telephone Number 1 by checking the appropriate Phone Port box.

2 If your ISDN line has two telephone numbers, specify

which Phone port should handle the calls associated with Telephone Number 2.

3 Click the Update button to download the change to your

3C882 ISDN modem’s S register.

Verifying the Conﬁguration

Check the status bar located toward the bottom of the Conﬁguration dialog box. If the parameters were conﬁgured accurately and the 3C882 ISDN modem is ready to send and receive calls, the status bar ﬁelds will appear as shown here.

■ Layer 1: UP

■ SPID 1: Init (if required)

■ TEI 1: Number from 64 to 126

■ SPID 2: Init (if required)

■ TEI 2: Number from 64 to 126 (if required)

Configuring the 3C882 ISDN Modem for a PC 3-12

The TEI number(s) are not conﬁgured by the user. The TEI number(s) are transmitted by the telephone company for informational purposes only.

Before you close the Conﬁguration dialog box, do the following.

1 Conﬁrm that the Conﬁguration dialog box parameters are

correct.

2 Click the Update Conﬁguration button to update this

information to the 3C882 ISDN modem.

3 Click Exit to leave the utility.

This completes the ISDN modem conﬁguration procedure. For Windows 3.x users, go to Chapter 5, “Advanced

Conﬁguration,” and review the default settings to ensure that they reﬂect your preferences. If you prefer not to change the default settings, go on to Chapter 6, “Placing and Receiving Calls.”

If you are using Windows 95 or Windows NT™ Remote Access Service (RAS), refer to the appropriate section, “Setup Using Windows 95” or “Setup Using Windows NT RAS” for additional instructions.

For information about how to use the 3C882 ISDN modem with tested Internet access software, use the 3Com fax service (1) (408) 727-7021 (analog) in the U.S. or visit 3Com’s World Wide Web site at http://www.3Com.com/.

Setup Using Windows 95

This section describes how to set up the 3C882 ISDN modem using Windows 95 Plug and Play. These instructions assume that Windows 95, Microsoft Plus!, and the 3C882 ISDN modem software have already been installed.

1 Reboot your PC with the 3C882 ISDN modem powered up

and physically connected to your PC.

The New Hardware dialog box appears, shown in Figure 3-12.

Setup Using Windows 95 3-13

Figure 3-12 New Hardware Dialog Box

2 Select the Driver from disk provided by hardware

manufacturer option.

3 Click OK.

The Install From Disk dialog box appears, as shown in Figure 3-13.

Setup Using Windows 95 3-14

Figure 3-13 Install From Disk Dialog Box

4 Insert the 3ComImpact IQ Windows & DOS Installation

Diagnostic Utilities diskette into an available ﬂoppy drive.

5 Click OK.

The Select Device dialog box appears, as shown in Figure 3-14.

Figure 3-14 Select Device Dialog Box

Setup Using Windows 95 3-15

6 Select 3ComImpact IQ and then click OK.

If you are planning to run your computer at the maximum

230.4 Kbps baud rate, you must set up the driver that allows a maximum 230.4 Kbps baud rate. To do so, go on to step 7.

Otherwise, if you plan to run your computer at baud rates up to 115.2 Kbps, the process is complete. Go to Chapter 5, “Advanced Conﬁguration,” to review the default settings and ensure that they reﬂect your preferences. I f you prefer not to change the default settings, then go on to Chapter 6, “Placing and Receiving Calls.”

7 From the Control Panel dialog box, double click on the

Modems icon.

The Modems Properties dialog box appears.

8 Click Add.

The Install New Modem dialog box appears, as shown in Figure 3-15.

Figure 3-15 Install New Modems Dialog Box

Setup Using Windows 95 3-16

9 Check the box to prevent automatic detection of the

3ComImpact IQ ISDN modem.

10 Click Next.

The dialog box shown in Figure 3-16 appears.

Figure 3-16 Modem Manufacturers and Models Dialog Box

11 From the Manufacturers list box, select 3COM. 12 From the Models list box, select 3ComImpact IQ 230K. 13 Click Next. 14 Select the appropriate COM port. 15 Click Next.

A dialog box indicates successful setup.

16 Click Finish.

This completes the setup procedure.

Setup Using Windows NT RAS 3-17

Go to Chapter 5, “Advanced Conﬁguration,” to review the default settings and ensure that they reﬂect your preferences. If you prefer not to change the default settings, go on to Chapter 6, “Placing and Receiving Calls.”

Setup Using Windows NT RAS

This section describes how to set up the 3C882 ISDN modem using Windows NT RAS version 3.5.1.

1 Using the File Manager, locate the Windows NT

MODEM.INF ﬁle in the %SystemRoot%/System32/RAS directory and rename it MODEM.ORG.

For example, if your root director y is windows, you would look for the Windows NT MODEM.INF ﬁle in the following directory:

C:\windows\System32\RAS

2 Copy the 3C882 ISDN modem MODEM.INF ﬁle to the same

directory as the MODEM.ORG ﬁle.

3 From the main menu, select Control Panel, and then select

Network.

The Network Settings dialog box appears, as shown in Figure 3-17.

Setup Using Windows NT RAS 3-18

Figure 3-17 Network Settings Dialog Box

4 From the Installed Network Software list box, select

Remote Access Service and then click Conﬁgure.

The Remote Access Setup dialog box appears, as shown in Figure 3-18.

Figure 3-18 Remote Access Setup Dialog Box

5 If a modem is already conﬁgured, select it, and then click

Remove.

Setup Using Windows NT RAS 3-19

6 Click Add.

The Add Port dialog box appears.

7 Select a COM port, and then click OK.

The Remote Access Setup message box appears.

8 Click Cancel.

The Conﬁgure Port dialog box appears.

9 Select 3ComImpact IQ for baud rates up to 115.2 Kbps or

select 3ComImpact IQ 230K for baud rates up to 230.4 Kbps and then specify the port usage. Click OK.

The Remote Access Setup dialog box appears.

10 Click Continue. 11 Click OK to exit the Network Settings dialog box.

The Network Settings Change alert box appears.

12 Click Restart Now.

Once your computer has rebooted, you are ready to use the 3C882 ISDN modem.

CONFIGURATION FOR AN

APPLE MACINTOSH COMPUTER

This chapter describes how to conﬁgure the 3C882 ISDN modem using an Apple Macintosh computer.

You will need the ISDN telephone numbers from the ISDN Information Sheet you completed in Chapter 1.

Conﬁguring the 3C882 ISDN Modem for a Macintosh Computer

The main steps are shown in Figure 4-1.

Install 3C882

software

Run

SPID Wizard

Configure

Multilink PPP,

B channel rate, &

voice call routing

Verify

configuration

Figure 4-1 Main 3C882 Conﬁguration Steps for a Macintosh

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-2

Installing the 3C882 Software

To install the 3C882 ISDN modem software in an Apple Macintosh computer:

1 Insert the 3ComImpact IQ Installer Diagnostic Utilities

software utility diskette into the ﬂoppy drive and then double-click the diskette icon.

2 Double-click the 3ComImpact IQ Installer icon shown in

Figure 4-2.

Figure 4-2 3ComImpact IQ Installer Icon

A message box appears.

3 Click Continue.

Figure 4-3 appears.

Figure 4-3 Installation Conﬁrmation Message Box

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-3

4 Click Continue.

Figure 4-4 appears.

Figure 4-4 Software Installation Location Dialog Box

5 Select the location on your hard drive where you would

like the 3ComImpact IQ folder. If you do not want to use the default folder name, change the name. Click Install.

After all of the 3ComImpact IQ ISDN modem software is installed, Figure 4-5 appears.

Figure 4-5 Successful Installation Message Box

6 Click OK.

This completes the software installation procedure.

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-4

Running SPID Wizard

The SPID Wizard automatically detects your telephone company’s switch type and conﬁgures the SPID(s). SPID Wizard automatically runs when you are conﬁguring the 3C882 ISDN modem for the ﬁrst time or if you connect the 3C882 ISDN modem to a different ISDN line. After the ISDN switch type, telephone number(s) and SPID(s) are conﬁgured, clicking on the 3ComImpact IQ program icon causes the Conﬁguration dialog box to be displayed.

You will need the ISDN telephone numbers from the ISDN Information Sheet you completed in Chapter 1.

1 Double-click the 3ComImpact IQ 3.0 program icon shown

in Figure 4-6.

Figure 4-6 3ComImpact IQ Program Icon

The Select Modem Port screen appears, as shown in Figure 4-7.

Figure 4-7 Select Modem Port Screen

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-5

2 Select the port to which the 3C882 ISDN modem is

connected and then click OK.

The SPID Wizard start screen appears, as shown in Figure 4-8.

Figure 4-8 SPID Wizard Start Screen

If you do not want to run the SPID Wizard, click Cancel. The Conﬁguration dialog box appears (see Figure 4-13). S elect your ISDN switch type, and then enter the telephone number(s) and, if required, enter the corresponding SPID(s) for your ISDN line. Refer to the section “Conﬁguring Multilink PPP”.

3 Click Next.

The SPID Wizard ﬁrst checks for ISDN layer 1 status, and then conﬁgures the switch type. The status is indicated, as shown in Figure 4-9.

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-6

Figure 4-9 Switch Detection Status Screen for Macintosh

After the switch type is conﬁgured, the First Telephone Number dialog box appears, as shown in Figure 4-10.

Figure 4-10 First Telephone Number Screen for Macintosh

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-7

4 Enter the ﬁrst telephone number for your ISDN line and

then click Next.

After SPID Wizard conﬁgures the SPID for the ﬁrst telephone number, Figure 4-11 appears.

Figure 4-11 Second Telephone Screen for Macintosh

5 If your ISDN line has a second telephone number assigned

to it, enter it here and then click Next. If it does not have a second telephone number assigned to it, leave the ﬁeld as is and then click Done.

If you entered a second telephone number for your ISDN line, the SPID for the second telephone number is conﬁgured.

A message box indicates that the conﬁguration was successful, as shown in Figure 4-12.

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-8

Figure 4-12 Successful Conﬁguration Screen

6 Click Done.

The on-line registration dialog box appears. Enter your information and then click Register Now. After your information is sent, the Conﬁguration dialog box appears, as shown in Figure 4-13.

Figure 4-13 Conﬁguration Dialog Box for Macintosh

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-9

The Conﬁguration dialog box buttons do the following. Update Conﬁguration. Click Update Conﬁguration to

download parameter changes to your ISDN modem’s S registers.

Update Firmware. Refer to the readme ﬁle for ﬁrmware download instructions.

Diagnostics. Use the Diagnostics tool only under the direction of technical support personnel.

Quit. Click Quit to leave the Conﬁguration dialog box.

Conﬁguring Multilink PPP

By default, Multilink PPP is enabled. To enable or disable Multilink PPP, do the following:

1 Click inside the Multilink check box in the PPP area to

clear it (disable) or check it (enable).

2 Click the Update Conﬁguration button to download the

change to your 3C882 ISDN modem’s S register.

Additional conﬁguration may be needed for Multilink PPP. For details refer to S registers 82 and 83 in Appendix B.

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-10

Conﬁguring the B Channel Rate

By default, the B Channel Rate is 56 Kbps. Check with your telephone company for the appropriate B Channel Rate.

To change the B Channel Rate, do the following:

1 Select the appropriate radio button, 56 Kbps or 64 Kbps. 2 Click the Update Conﬁguration button to download the

change to your 3C882 ISDN modem’s S register.

Conﬁguring Voice Call Routing

If you plan to use the analog Phone ports of the 3C882 ISDN modem, you may want to change the default setting. An example using the default setting is shown in Figure 4-14.

ISDN U

RS-232

RESET

9 VDC

• 5A MAX

Number 1

Route Voice Calls to: Phone Port 1 Phone Port 2

Number 2

Route Voice Calls to: Phone Port 1 Phone Port 2

Telephone Number:

Service Profile Identifier: (SPID)

Telephone Number:

Service Profile Identifier: (SPID)

9085551212

9085551213

015551212000

015551213000

908 555 1212 908 555 1213

Figure 4-14 Voice Call Routing Default Setting

By default, all Phone Port boxes are checked. This allows calls to and from both ISDN telephone numbers to ring both devices simultaneously.

You may want to exclusively assign a telephone number to a device. Instructions for conﬁguring two common scenarios is as follows.

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-11

Number 1

ISDN U

RS-232

RESET

9 VDC

• 5A MAX

908 555 1212 908 555 1213

Figure 4-15 Conﬁguration for One Telephone Number per Device

Telephone Number:

Service Profile Identifier: (SPID)

Route Voice Calls to: Phone Port 1 Phone Port 2

Number 2

Telephone Number:

Service Profile Identifier: (SPID)

Route Voice Calls to: Phone Port 1 Phone Port 2

9085551212

015551212000

9085551213

015551213000

One Telephone Number and Two Analog Devices. If you have only one telephone number for your ISDN line and two analog devices, check the Phone Port 1 and Phone Port 2 boxes, as shown in Figure 4-16. Calls to that telephone number will ring both devices allowing you to answer a call using either one.

Number 1

ISDN U

RS-232

RESET

9 VDC

• 5A MAX

908 555 1212 908 555 1212

Figure 4-16 Conﬁguration for One Telephone Number & Two Devices

Telephone Number:

Service Profile Identifier: (SPID)

Route Voice Calls to: Phone Port 1 Phone Port 2

Number 2

Telephone Number:

Service Profile Identifier: (SPID)

Route Voice Calls to: Phone Port 1 Phone Port 2

9085551212

015551212000

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-12

Note that while you are using the fax machine, for example, you cannot use the telephone to place or receive calls because your ISDN line has only one telephone number.

To change the voice call routing setting:

1 Specify which Phone port should handle the calls

associated with Telephone Number 1.

2 If your ISDN line has two telephone numbers, specify

which Phone port should handle the calls associated with Telephone Number 2.

3 Click the Update Conﬁguration button to download the

change to your 3C882 ISDN modem’s S register

Verifying the Conﬁguration

Check the status bar located toward the bottom of the Conﬁguration dialog box to verify correct conﬁguration. If the parameters were conﬁgured accurately and the 3C882 ISDN modem is ready to send and receive calls, the status bar ﬁelds will appear as shown here.

The TEI number(s) are not conﬁgured by the user. The TEI number(s) are provided by the telephone company for informational purposes only.

■ Layer 1: UP

■ SPID 1: Init (if required)

■ TEI 1: Number from 64 to 126

■ SPID 2: Init (if required)

■ TEI 2: Number from 64 to 126 (if required)

Configuring the 3C882 ISDN Modem for a Macintosh Computer 4-13

Before closing the Conﬁguration dialog box, do the following.

1 Conﬁrm that the Conﬁguration dialog box parameters are

correct.

2 Click the Update Conﬁguration button to update this

information to the 3C882 ISDN modem.

3 Click Quit to exit the Conﬁguration dialog box.

This completes the 3C882 ISDN modem conﬁguration. Go to Chapter 5, “Advanced Conﬁguration,” to review the

default settings and ensure that they reﬂect your preferences. If you prefer not to change the default settings, then go on to Chapter 6, “Placing and Receiving Calls.”

ADVANCED CONFIGURATION

Advanced Conﬁguration Parameter Default Values

To change advanced conﬁguration parameter values, you will need terminal emulation software to allow you to use AT commands.

For Windows 95 and Windows NT users, HyperTerminal terminal emulation software is provided with those operating systems. For Macintosh users, terminal emulation software was installed in the 3ComImpact IQ folder during software installation.

The advanced conﬁguration parameters and their default settings are as follows:

■ Auto Answer (disabled)

■ Baud Rate (automatic detection of rates up to 115.2 Kbps)

■ Compression (enabled)

■ Dynamic Bandwidth Allocation (enabled)

■ QuickSelect (enabled)

Each parameter is described in detail in the following section. If the default settings meet your preferences, go on to Chapter 6, “Placing and Receiving Calls.”

Advanced Configuration Parameter Default Values 5-2

QuickSelect

The QuickSelect feature automatically detects and uses the protocol required for each digital call, either V.120 or Async-Sync PPP. Typically, V.120 is used for communication between two computers, while PPP is used for communication between a computer and an Internet service provider.

DBA

Dynamic Bandwidth Allocation. DBA is a method of automatically reallocating bandwidth, such as a B channel. DBA allows you to place or receive a voice call while a Multilink PPP call is active.

When a voice call comes in, or if you lift the handset to place a call while you have both B channels in use because of Multilink PPP, one of the B channels is temporarily removed from the Multilink PPP call and is used for the voice call.

Once the voice call ends, that B channel is automatically returned to the Multilink PPP call. Although throughput is reduced while the voice call is active, the reliability of the Multilink PPP call is not affected.

If you are on the receiving end of a Multilink PPP call and you place a voice call, one of the B channels will be used for the voice call but once the voice call ends, the B channel cannot be returned to the Multilink PPP call. The B channel can only be returned to the Multilink PPP call if you placed the call.

Advanced Configuration Parameter Default Values 5-3

Auto Answer

When Auto Answer is disabled (the default), a RING message is delivered to the RS-232 port upon reception of an incoming data call to the 3C882 ISDN modem. Enter the command AT A to answer the incoming data call. A CONNECT message is then delivered to the RS-232 port upon successful connection.

If Auto Answer is enabled, the call is automatically answered after the number of rings you specify, and a CONNECT message, indicating the speed of the connection, is delivered to the RS-232 port.

Compression

Compression is a method of reducing the size of data without losing any information. The 3C882 ISDN modem automatically compresses data to improve data transfer times using the Stac compression method. The following check modes are negotiable— None, One Byte Sequence Number, and Extended. Extended is the preferred choice. The degree of compression depends on the type of ﬁle being transferred. For example, a tex t-only ﬁle compresses better than a ﬁle with graphics.

Compression is enabled (default) and will automatically be invoked unless you are running compression on your computer. If you are running compression on your computer, that compression method will be used instead of 3C882 compression even if 3C882 compression is enabled.

Baud Rate

By default, the baud rate is set using Autobaud. Autobaud automatically detects the maximum data rate of your computer’s COM por t. Rates up to 115.2 Kbps can be detected automatically. 3Com recommends that you leave Autobaud enabled unless you want to set the baud rate to

230.4 Kbps. The command AT $B (baud rate) is used to set a speciﬁc baud rate, such as 230.4 Kbps. Refer to Appendix B for a list of acceptable values.

Changing The Parameter Settings 5-4

To access the 3C882 Conﬁguration dialog box, Autobaud must be enabled. If the baud rate is set to a speciﬁc rate, you will not be able to access the Conﬁguration dialog box. Before setting a speciﬁc baud rate, ensure that the Conﬁguration dialog box parameters are set appropriately.

To set the baud rate to the maximum of 230.4 Kbps, do the following:

1 Ensure that your computer’s COM port and

communications software support 230.4 Kbps.

2 Send the command AT $B 230400 to the 3C882 ISDN

modem.

For instructions on how to send AT commands, refer to the section “Changing The Parameter Settings”.

3 Change the setting of your application program to

230400 bps.

This completes the procedure to change the baud rate to

230.4 Kbps.

Changing The Parameter Settings

To change parameter settings:

1 Launch your communications or terminal emulation

software.

Be sure your communications software is in terminal mode.

2 Be sure the 3C882 ISDN modem is in command mode

(sometimes called local mode or terminal mode) so that it interprets your commands.

When your computer is powered on, the 3C882 ISDN modem automatically starts in command mode. If you have recently used the 3C882 ISDN modem to make a call and have not yet disconnected, type +++ to switch to command mode.

3 Type:

AT <command>

4 Press Enter or Return.

Refer to Table 5-1 for the appropriate command. For example, to disable compression, type AT%C0, and then press [Enter] or [Return].

An AT command line star ts with the characters AT. The command line accepts up to 40 command characters in the line (not including the two AT characters, or spaces).

After completing its tasks, the 3C882 ISDN modem sends a message to the screen followed by a result code. Refer to Appendix B for a complete list of result codes.

5 To change another parameter setting, repeat steps 1

through 4. Other wise, go on to Chapter 6, “Placing and Receiving Calls.”

Table 5-1 Changing Default Settings

Changing The Parameter Settings 5-5

Parameter Default Value To Change the Default

QuickSelect Enabled Send the command ATS71=1 to use Async-Sync

PPP exclusively or ATS71=2 to use V.120 exclusively. DBA Enabled Send the command ATS70=0 to disable DBA. Auto Answer Disabled Send the command ATS0=(number of rings before

the ISDN modem answers the call) to enable Auto

Answer. Compression Enabled Send the command AT%C0 to disable compression. Autobaud Enabled Send the command AT$B (rate) to set a specific

baud rate. Acceptable values are 1200, 2400, 4800,

9600, 19200, 38400, 57600, 115200, and 230400.

Send the command AT$B0 to return to Autobaud.

Autobaud does not exceed 115200. For 230400 you

must send AT $B230400 to the ISDN modem.

* To access the Configuration dialog box, the baud rate must be set to Autobaud.

PLACING AND RECEIVING CALLS

This chapter illustrates how to place and receive a variety of calls with your 3C882 ISDN modem. The 3C882 ISDN modem uses AT commands and S registers for call management.

This chapter covers the following:

■ Placing ISDN data calls

■ Placing a Multilink PPP call

■ Placing a 56K TollSaver call

■ Receiving ISDN data calls

■ Placing calls using an analog phone port

■ Receiving calls using an analog phone port

Placing ISDN Data Calls

You can let your communications software send and receive calls for you, or you can use a terminal emulator to place calls manually. Soft ware that communicates using AT commands is required to control the 3C882 ISDN modem. You can enter these codes manually. However, they are often entered automatically by modem communications software.

When you place a call, the B channel LED(s) ﬂash green, then remain lit once the call is established. (If you are running Multilink PPP, one B channel ﬂashes and then remains lit. Then, the second B channel ﬂashes and then remains lit.)

For Macintosh users, add &DO to the modem initialization string of your communications software.

Placing Calls Automatically

If you are using standard communications software, select the 3ComImpact IQ ISDN modem. If the 3ComImpact IQ ISDN modem is not listed, select a Hayes modem conﬁguration and dial out through the 3C882 ISDN modem. If you are using a Hayes-compatible modem conﬁguration, you may have to manually conﬁgure settings such as baud rate. Refer to your communications software documentation for more details.

Placing Calls Manually

You can place calls manually using AT commands. Your communications software must be in terminal emulation mode.

Follow these steps to use AT commands:

In most situations, an initialization string is not necessary with the 3C882 ISDN modem. If an initialization string is required by the communications software or server, use the Hayes default initialization string.

Placing ISDN Data Calls 6-2

-compatible

1 Launch your communications software.

Be sure your communications software is in terminal mode.

2 Be sure the 3C882 ISDN modem is in command mode

(sometimes called local mode or terminal mode) so that it interprets your commands.

Placing ISDN Data Calls 6-3

3 Type:

AT D <telephone number>

The 3C882 ISDN modem recognizes the AT command ATD to dial a digital ISDN data call. Correct examples of outgoing circuit-switched ISDN modem commands with dial strings are:

AT D 1 408 654 2703 ATD14086542703

For a summary of the AT command set, see Appendix B.

4 Press Enter or Return.

After completing its tasks, the 3C882 ISDN modem sends a message to the screen.

An AT command line starts with the characters AT. The command line can accept up to 40 command characters in the line (not including the two AT characters, or spaces).

Placing Multilink PPP Calls

Before you place a call, ensure that the Multilink PPP box on the 3C882 ISDN modem Conﬁguration dialog box is checked. Also, the destination you are calling must also support Multilink PPP. For example, if you are trying to dial into the Internet, your Internet service provider must also support Multilink PPP in order to successfully place a Multilink PPP call.

Although this is not generally the case, your Internet Service Provider may require an Endpoint Identiﬁer Class and an Endpoint Identiﬁer. The Endpoint Identiﬁer Class is conﬁgured using S register 82. The Endpoint Identiﬁer is conﬁgured using S register 83. Refer to Appendix B for acceptable values.

Placing a 56K TollSaver Call 6-4

For automatic placement of a Multilink PPP call, simply launch the call. For manual dialing, type the following:

ATD <telephone number>

An example is as follows: ATD 1 908 555 1212 Some Internet service providers require you to dial two

telephone numbers to place a Multilink PPP call. The ampersand (&) character is used to dial two telephone numbers.

To automatically dial two telephone numbers, add the following to the dial string of your application software:

An example is as follows: 1 908 555 1212 & 1 908 555 1213 To manually dial two telephone numbers, type the following:

ATD <telephone number 1>&<telephone number 2>

An example is as follows: ATD 1 908 555 1212 & 1 908 555 1213

Placing a 56K TollSaver Call

You can place a 56 Kbps data call using a voice channel, saving you the additional cost of a data call.

The device you are dialing into must be capable of generating the 2.1 kHz tone needed to disable the echo cancellers on the line. For a list of devices which provide that capability, refer to the readme ﬁle on the software diskette.

To manually dial a 56K TollSaver call on a call by call basis, type the following:

ATDD <telephone number>

An example is as follows: ATDD 1 908 555 1212

By setting S Register 61=1, all outgoing calls will be 56K TollSaver calls.

Receiving ISDN Data Calls

The 3C882 ISDN modem can receive incoming circuit-switched data calls from other 3C882 ISDN modems or from ISDN devices.

If Auto Answer is disabled, when a data call comes in, a RING message is delivered to the RS-232 port upon reception of an incoming data call to the 3C882 ISDN modem. Enter the command AT A to answer the incoming data call. A CONNECT message is then delivered to the RS-232 port upon successful connection.

Receiving ISDN Data Calls 6-5

If Auto Answer is enabled, the call is automatically answered and a CONNECT message, indicating the speed of the connection, is delivered to the RS-232 por t.

When the 3C882 ISDN modem receives a voice call, the B channel LED(s) ﬂash green, and then remain lit once the call is answered. (If you are running Multilink PPP, both B channels ﬂash and then remain lit.)

Placing Voice Calls Using an Analog Phone Port 6-6

Placing Voice Calls Using an Analog Phone Port

To place an outgoing call, simply take the telephone handset or external fax machine off the hook, wait for a dial tone, and dial the destination telephone number.

When you place a voice call, a B channel LED ﬂashes amber, and then remains lit once the call is established.

Receiving Voice Calls Using an Analog Phone Por t

By default, incoming calls to ISDN telephone number one ring devices connected to both ports simultaneously. Calls coming to ISDN telephone number two also ring both devices simultaneously.

If both ports are busy, the third incoming call generates a busy signal to the far end.

When the 3C882 ISDN modem receives a voice call, a B channel LED ﬂashes amber, and then remains lit once the call is answered.

TROUBLESHOOTING

This chapter explains how to isolate and solve problems encountered with the 3C882 ISDN modem. Problems may stem from incorrect option settings or improper installation.

This chapter covers the following main topics:

■ Checking the basics

■ Monitoring the LEDs

■ Evaluating symptoms and solutions

■ Using on-line help

■ Finding more information

■ Contacting technical support

■ Downloading Firmware

There are no user-serviceable parts inside your 3C882 ISDN modem. Unauthorized opening of the unit will void the warranty.

Checking the Basics

Before you monitor the LEDs or refer to the section on symptoms and solutions, check the following:

■ Verify that the cables are not physically damaged.

If damage is apparent, replace the cable.

■ Verify that the power cord is connected to the

3C882 ISDN modem and an electrical outlet.

■ Verify that the ISDN cable is properly connected to the

3C882 ISDN modem and the ISDN wall jack.

The 3C882 ISDN modem will not operate if connected to an analog telephone wall jack. Make sure that the 3C882 ISDN modem is connected directly into the ISDN wall outlet without connection to any intermediate telephone equipment (an NT1 device is not required with the 3C882 ISDN modem).

Monitoring LEDs

If you are experiencing operational inconsistencies, monitor the TEST, D channel, and B channel LEDs to isolate problems.

Monitoring the TEST LED

Press the Reset button and observe the TEST LED. During power-up self-test, the TEST LED ﬂashes.

■ If the LED goes out after the test has been completed, the

test has been successful.

Monitoring LEDs 7-2

■ If the TEST LED ﬂashes and remains on for more than a few

minutes, there is an internal failure. Notify your reseller that the 3C882 ISDN modem has failed the self-test, and order a replacement.

Monitoring the D Channel LED

Observe the D channel LED. If you are connected to a live digital ISDN line, the D channel LED remains lit for up to a few minutes after the self-test and then begins to ﬂash. When the D channel LED ﬂashes, it indicates that the ISDN signal is present and it is attempting to synchronize with the telephone company.

When the D channel LED goes out, it indicates that a valid communication channel has been established and you can place calls. If the D channel LED does not go out, refer to the “Evaluating Symptoms and Solutions” section.

Evaluating Symptoms and Solutions 7-3

Monitoring the B Channel LEDs

Attempt to place a call and observe the B channel LED(s). The B1 and B2 LEDs ﬂash amber for a voice call or green for a data call during the call establishment phase. They then remain continuously amber or green once the connection is established. If they do not remain continuously amber or green, refer to the “Evaluating Symptoms and Solutions” section.

Evaluating Symptoms and Solutions

Table 7-1 lists symptoms of common problems, possible causes, and possible solutions.

Table 7-1 Symptoms, Causes, and Solutions

Symptom Possible Cause Solution

TEST LED remains lit for more than a few minutes

D channel remains lit for more than a few minutes

D channel continues to flash for more than a few minutes

Calls cannot be placed from analog equipment

(continued)

An internal failure. Notify 3Com Technical Support that

Poor physical connection to the local telephone company.

A mismatch between the settings of the ISDN line and the 3C882 ISDN modem configuration.

If you cannot place a calls, there may be a problem with the configuration of your ISDN line.

Calls from that analog port may be blocked.

the 3C882 ISDN modem has failed the self-test.

If the telephone wires at your site appear to be satisfactory, call your local telephone company for repair of telephone company equipment and troubleshooting assistance.

Verify the telephone number and SPID (if required). If the D channel LED continues to flash, call your telephone company to verify the SPID and telephone number and ensure that the telephone company has configured the ISDN line properly (refer to Appendix A).

Call the telephone company and have it verify that your line is configured for circuit-switched voice and data service.

From the Configuration dialog box, check the Phone Port 1 and Phone Port 2 boxes which are used for voice call routing. Ensure that the correct Phone Port box for that port is checked.

Evaluating Symptoms and Solutions 7-4

Table 7-1 Symptoms, Causes, and Solutions

Symptom Possible Cause Solution

B channel LED(s) do not remain green or amber

A connection has been established (B-1 or B-2 green

LED remains lit and you receive a CONNECT message) but data

cannot be sent Upon power up,

both the TEST and D channel LEDs flash.

Both B1 and B2 flash when the D channel lights

Cannot place or receive two simultaneous voice calls.

Problem with your computer or application software or incompatible local or toll telephone company.

There is an interoperability mismatch between the local and remote applications.

A previous firmware download did not complete successfully.

The 3C882 ISDN modem baud rate is set to 230.4 Kbps.

Your ISDN line may only have one telephone number. Your ISDN line must have two telephone numbers to allow both analog phone ports to be used simultaneously.

Carefully monitor the B1 and B2 LEDs while attempting a call. These LEDs flash during call establishment and then remain green or amber once the connection is established.

If neither LED flashes, ensure that your computer is turned on and operational, and that your application software has sent an AT dial command in the proper format.

There may be an incompatible local or toll telephone company. Contact your local telephone company and have it verify that you can dial a data call to the destination telephone number.

Make sure that the local and remote data applications have communications capability and are properly configured.

Download the firmware. Refer to the Readme file for firmware download instructions.

Ensure that your computer’s COM port supports 230.4 Kbps or change the COM port setting of either your computer or the ISDN modem so that both devices are set to the same COM port rate.

Check your ISDN line configuration. If you have only one telephone number you have to add a second telephone number.

Using On-Line Help

The following on-line help is available.

■ For comprehensive information about the 3C882 ISDN

modem, click on the 3ComImpact IQ Help icon in the 3ComImpact IQ program group.

■ From the 3C882 Conﬁguration dialog box for Windows, click

the Help button for information about the Conﬁguration dialog box.

Finding More Information

For more information about the 3C882 ISDN modem, such as frequently asked questions, and speciﬁc technical notes, use 3Com’s fax service (1) (408) 727-7021 in the U.S. or visit 3Com’s World Wide Web site at http://www.3Com.com/.

Contacting Technical Support

Using On-Line Help 7-5

If you have gone through the troubleshooting tips and still have not been able to resolve the problem, contac t 3Com Technical Support at (800) 876 3266. When you call, please have the following information available:

■ The serial number of your 3C882 ISDN modem

■ A list of symptoms, including any LED status information and

computer display status

■ The type of application software you are running and the

version number

Downloading Firmware to Your 3C882 ISDN Modem

Your 3C882 ISDN modem has been uniquely designed to be user-upgradable. The latest ﬁrmware for your 3C882 ISDN modem is available on 3Com’s ftp site, ftp.3Com.com. Refer to your readme ﬁle for instructions about how to download ﬁrmware.

ORDERING ISDN SERVICE

This appendix describes how to order ISDN service. You can either let 3Com order ISDN service for you, or you can call your telephone company and order it yourself.

Placing the ISDN Order Through 3Com

Simply call 1-800-572-3Com to have your ISDN line ordered for you. 3Com will provide the appropriate line parameters to your telephone company and schedule installation of your ISDN line.

Placing the ISDN Order Through Your Telephone Company

To order the ISDN ser vice from the telephone company for the 3C882 ISDN modem:

1 Call the telephone company and ask for the ISDN

representative.

A list of telephone numbers for major U.S. telephone companies is provided at the end of this appendix.

2 Tell the representative that you want to place an order for

ISDN service for a 3ComImpact IQ External ISDN modem and that you have the line provisioning and ISDN information that the telephone company requires.

3 Give the representative the 3C882 ISDN modem ISDN

code.

There are two ISDN codes that work with the 3C882 ISDN modem, pack age K and package U. Review Table A-1 and then decide which package you prefer to order.

Placing the ISDN Order Through Your Telephone Company A-2

Table A-1 ISDN Order Codes

ISDN Order Code Number of Telephone Numbers

Package K 1 Package U 2

* Having two telephone numbers assigned to an ISDN line allows

both analog ports to be used simultaneously. If only one telephone number is assigned, the ISDN line can only place or receive one call at a time.

If the representative has the requested code listed, go to step

7. If the representative does not have the code listed, go to step 4.

4 Ask the representative which ISDN switch type your ISDN

line will be using. Place a check mark in the appropriate box on the supplied ISDN Information Sheet (see Figure 1-2).

5 Look for the ISDN switch type table in this appendix. 6 Provide the information for your speciﬁc switch type to

the telephone company.

7 Ask the ISDN representative to provide the information

you need to ﬁll out the ISDN Information Sheet shown in Figure 1-2.

This completes the procedure for ordering your ISDN line.

Placing the ISDN Order Through Your Telephone Company A-3

AT&T 5ESS Switch

To order ISDN ser vice for the AT&T® 5ESS switch, supply the telephone company with the information provided in Table A-2.

NI1

Table A-2 Line Conﬁguration for AT&T 5ESS NI1

Required Information Specification

Line Type Standard (2B+D) National ISDN-1 line Line Code 2B1Q Interface Type U interface with an RJ-45 jack Directory Numbers 2 Maximum Terminals 1 Maximum B Channels 2 Actual User Yes Circuit-switched Voice 2 Circuit-switched Voice Channel Any Circuit-switched Data 2 Circuit-switched Data Channel Any Terminal Type A (Basic Terminal) Display Yes Circuit-switched Voice Limit 2 Circuit-switched Data Limit 2 Voice or Data Both Call Appearance Preference Idle Flexible Call Offering (FCO) Yes

†

* The Directory Number, Circuit-switched Voice, and Circuit-switched Voice Limit

parameters should be set to 2 to allow both analog ports to be used simultaneously. Otherwise, if those parameters are set to 1, the ISDN line can only place or receive one call at a time.

† FCO (also referred to as Additional Call Offering) allows you to receive an incoming call

while a dual-channel Multilink PPP call is active. If you do not want this feature, which may cost extra, FCO is not required.

Placing the ISDN Order Through Your Telephone Company A-4

AT&T 5ESS Custom

To order ISDN ser vice for the AT&T 5ESS Custom switch, supply the telephone company with the information provided in Table A-3.

Switch

Table A-3 Line Conﬁguration for AT&T 5ESS Custom

Required Information Specification

Line Type Standard (2B+D) ISDN line with

Line Code 2B1Q Interface Type U interface with an RJ-45 jack Directory Numbers 2 Maximum Terminals 1 Maximum B Channels 2 Actual User Yes Circuit-switched Voice 2 Circuit-switched Voice Channel Any Circuit-switched Data 2 Circuit-switched Data Channel Any Terminal Type A (Basic Terminal) Display Yes Circuit-switched Voice Limit 2 Circuit-switched Data Limit 2 Voice or Data Both Call Appearance Preference Idle Flexible Call Offering (FCO) Yes

point-to-point configuration

†

* The Directory Number, Circuit-switched Voice, and Circuit-switched Voice Limit

parameters should be set to 2 to allow both analog ports to be used simultaneously. Otherwise, if those parameters are set to 1, the ISDN line can only place or receive one call at a time.

† FCO (also referred to as Additional Call Offering) allows you to receive an incoming call

while a dual-channel Multilink PPP call is active. If you do not want this feature, which may cost extra, FCO is not required.

Placing the ISDN Order Through Your Telephone Company A-5

Northern

Telecom

DMS

To order ISDN ser vice for the Northern Telecom® DMS 100 switch, supply the telephone company with the information provided in Table A-4.

100

Switch

Table A-4 Line Conﬁguration for DMS 100

Required Information Specification

Line Type Standard (2B+D) National ISDN-1 line Line Code 2B1Q Interface Type U interface with an RJ-45 jack Directory Numbers 2 Circuit-switched Option Yes Bearer Restriction Option No packet mode data (NOPMD) Protocol Functional version 2 (PVC 2) SPID Suffix 1 Terminal Endpoint Identifier (TEI) Dynamic Maximum Keys 64 Ring No Key System (EKTS) No Voice or Data Both Data Option Lower layer compatibility Flexible Call Offering (FCO) Yes*

* FCO (also referred to as Additional Call Offering) allows you to receive an incoming call

while a dual-channel Multilink PPP call is active. If you do not want this feature, which may cost extra, FCO is not required.

Placing the ISDN Order Through Your Telephone Company A-6

Siemens EWSD Switch

To order ISDN ser vice for the Siemens® EWSD switch, supply the telephone company with the information provided in Table A-5.

Table A-5 Line Conﬁguration for Siemens EWSD

Required Information Specification

Line Type Standard (2B+D) National ISDN-1 line Line Code 2B1Q Interface Type U interface with an RJ-45 jack Directory Numbers 2

Circuit-switched Data and Voice Yes Bearer Restriction Option No packet mode data (NOPMD) Protocol Functional SPID Suffix 1 Terminal Endpoint Identifier (TEI) Dynamic Key System (EKTS) No Flexible Call Offering (FCO) Yes

* The Directory Number, Circuit-switched Voice, and Circuit-switched Voice Limit

parameters should be set to 2 to allow both analog ports to be used simultaneously. Otherwise, if those parameters are set to 1, the ISDN line can only place or receive one call at a time.

† FCO (also referred to as Additional Call Offering) allows you to receive an incoming call

while a dual-channel Multilink PPP call is active. If you do not want this feature, which may cost extra, FCO is not required.

†

AT C OMMANDS,

S REGISTERS, AND RESULT

CODES

The 3C882 ISDN modem AT commands are summarized in Table B-1, S registers in Table B-2, and result codes in Table B-3.

AT Command Set

Table B-1 summarizes the AT command set for the 3C882 ISDN modem.

Table B-1 AT Command Set Summar y

Command Function (Example) Description

A Answer incoming circuit-switched

ISDN modem call (AT A)

%C Compression When enabled, compresses data to

&C Serial port CD control (AT &C2) &C0 forces CD to remain on at all times.

D (ATD5551234) Dials an outgoing 56/64 Kbps

DD (ATDD5551234) Dials an outgoing switched 56 Kbps

(continued)

Answers an incoming data call.

improve data transfer times using the Stac compression method. The following check modes are negotiable— None, One Byte Sequence Number, and Extended. Extended is the preferred choice.

%C0 disables compression. %C2 enables compression.

&C1 forces CD to follow the state of carrier from the remote system. CD turns on after CONNECT message is sent to host (default).

&C2 forces CD to remain on except temporarily after disconnect.

circuit-switched digital connection.

permissive connection.

AT Command Set B-2

Table B-1 AT Command Set Summar y (continued)

Command Function (Example) Description

&D DTR control (AT &D0) &D0 causes ISDN modem to ignore DTR

E AT command echo (AT E0) E0 disables the echo of AT commands

&F Restore factory defaults (AT &F) Restores all factory default settings. H Hang up (AT H) Hangs up the current connections. I Identification (AT I0) I0 displays the model number.

O Enter connect state (AT O) Causes the ISDN modem to go out of

Q Result code control (AT Q0) Q0 enables the output of result codes

\Q Serial port flow control (AT \Q1) \Q0 disables flow control.

%R Read all S registers (AT %R) Provides an output list of all S registers. %S Serial number Displays serial number of ISDN modem. Sn? Read configuration register

(AT S60?)

from host. &D1 causes ISDN modem to enter

command state on detecting on-off transition of DTR.

&D2 causes ISDN modem to hang up current calls upon on-off transition of DTR and prepares serial port to accept AT command at any speed (default).

back to the host computer. E1 enables the echo of AT commands to

the host computer (default).

I1 displays the flash memory checksum. I2 computes and compares the flash

memory checksum to a prestored value. I3 displays the product name and release

number.

command mode into on-line mode.

(default). Q1 disables the output of result codes. Q2 disables the output of result codes in

answer mode only.

\Q1 enables bidirectional XON/XOFF software flow control.

\Q3 enables bidirectional RTS/CTS hardware flow control (default).

Reads a specific S register setting.

(continued)

AT Command Set B-3

Table B-1 AT Command Set Summar y (continued)

Command Function (Example) Description

Sn= Write configuration register

Writes to a specific S register.

(AT S60=64)

\S Read on-line status: command

settings (AT \S)

Reads the status of any parameters that have been modified through AT commands and provides call status information.

\T Link inactivity timer (AT \T1) \T0 disables inactivity timer (default).

\Tn link inactivity timer in minutes. The ISDN modem automatically disconnects the call if no activity is sensed within n (n = 0–255) minutes.

V Result code format (AT V0) V0 enables short form result codes.

V1 enables long form result codes (default).

W Displays connection speed W0 displays COM port rate only (default)

W1 displays COM port and ISDN data rate W2 displays ISDN data rate only

&W Stores configuration (AT &W) Stores the configuration of all S registers

that are not part of the ISDN modem initial configuration set.

Z Reset (AT Z) Disconnects all calls in progress and

performs a complete ISDN modem system reset.

+++ Enter command state Causes ISDN modem to enter the

command state if it is currently in the on-line state.

Set baud rate (AT $B57600) 0 — Autobaud (default). Other settings

are 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, and 230400. Autobaud does not exceed 115200. For 230400 you must send the command AT $B230400 to the ISDN modem.

%V Show version number (AT %V) Displays ISDN modem firmware version.

* To access the Configuration dialog box, the baud rate must be set to Autobaud.

S Registers

Table B-2 provides a complete list and descriptions of the S registers supported by the 3C882 ISDN modem. All S registers except S0 are the 3Com extended registers.

S registers notated with an asterisk are stored in non-volatile memory and will not be cleared or returned to the default value if the ISDN modem is powered down.

Table B-2 S Registers

Registers Descriptions

S0 Auto Answer:

0 — Disabled (default) X— Number of rings before auto answer.

S50

S51

S52

S53

S54 S55 Terminal Endpoint Identifier 1:

S56 Terminal Endpoint Identifier 2:

(continued)

ISDN Switch Signaling Type: 0 — Unknown (default) 1 — AT&T 5ESS Custom 3 — NI1/AT&T 5ESS 6 — NI1/NTI DMS 100 or Siemens EWSD Phone #1 Phone #1 Service Profile ID (SPID) Phone #2 (if required by your carrier) Phone #2 Service Profile ID (SPID) (if required by your carrier)

Stores the first TEI assigned by the switch. A value of 255 indicates no TEI has been assigned. This field is read-only.

Stores the second TEI assigned by the switch if a second directory number is required by your carrier. A value of 255 indicates no TEI has been assigned. This field is read-only.

S Registers B-4

Table B-2 S Registers (continued)

Registers Descriptions

S57 Terminal Initialization State:

Indicates the status of the first TEI using SPID 1. This field is read-only. 0 — ISDN modem has not attempted initialization 1 — ISDN modem has initialized successfully using SPID 1 2 — ISDN modem has failed initialization using SPID 1

S58 Terminal Initialization State:

Indicates the status of the second TEI using SPID 2. This information is provided only if your carrier requires a second directory number. This field is read-only.

0 — ISDN modem has not attempted initialization 1 — ISDN modem has initialized successfully using SPID 2 2 — ISDN modem has failed initialization using SPID 2

S59 U Interface Status:

This field is read-only. 0 — ISDN U interface is not synchronized with the switch 1 — ISDN U interface is synchronized and ready

S60

B Channel Data Rate: 56 — 56 Kbps (default) 64 — 64 Kbps

S61 Outgoing Call Type:

0 — Follow dial modifiers (default) 1 — Switched 56 permissive 2 — ISDN

(continued)

S Registers B-5

Table B-2 S Registers (continued)

Registers Descriptions

S63

Voice Call Routing (bit map) 0 — Calls to either analog port are blocked 1 — Phone #1 to Phone port 1 only; Phone #2 calls blocked 2 — Phone #1 to Phone port 2 only; Phone #2 calls blocked 3 — Phone #1 to Phone port 1 or 2; Phone #2 calls blocked 4 — Phone #1 calls blocked; Phone #2 to Phone port 1 only 5 — Phone #1 to Phone port 1 only; Phone #2 to Phone port 1 only 6 — Phone #1 to Phone port 2 only; Phone #2 to Phone port 1 only 7 — Phone #1 to Phone port 1 or 2; Phone #2 to Phone port 1 only 8 — Phone #1 calls blocked; Phone #2 to Phone port 2 only 9 — Phone #1 to Phone port 1 only; Phone #2 to Phone port 2 only 10 — Phone #1 to Phone port 2 only; Phone #2 to Phone port 2 only 11 — Phone #1 to Phone port 1 or 2; Phone #2 to Phone port 2 only 12 — Phone #1 calls blocked; Phone #2 to Phone port 1 or 2 13 — Phone #1 to Phone port 1 only; Phone #2 to Phone port 1 or 2 14 — Phone #1 to Phone port 2 only; Phone #2 to Phone port 1 or 2 15 — Phone #1 to Phone port 1 or 2; Phone #2 to Phone port 1 or 2

(default)

S65 ISDN Caller ID for Voice Calls for Phone Port 1:

Displays the phone number of an incoming voice call over phone port 1. This field is read-only.

S66 ISDN Caller ID for Voice Calls for Phone Port 2:

Displays the phone number of an incoming voice call over phone port 2. This field is read-only.

S67 ISDN Caller ID for Data Calls:

Displays the phone number of an incoming data call. This field is read-only.

S70

Dynamic Bandwidth Allocation (DBA): 0 — DBA disabled 1 — DBA enabled (default)

(continued)

S Registers B-6

Table B-2 S Registers (continued)

Registers Descriptions

S71 B Channel Protocol:

0 — QuickSelect (default) 1 — Async-Sync PPP conversion 2 — V.120

S73 V.120 Frame Type:

0 — I frame (default) 1 — UI frame

S74 V.120 Maximum Frame Size (range 240–256):

256 — Maximum frame size of 256 (default)



248 — Maximum frame size of 248 (for AdTran

compatibility, use 253)

S75 Connection Delay:

Specifies whether the ISDN modem immediately answers a call or waits 2 seconds to answer. If you are using Windows NT, use the two-second delay.

0 — No delay (default) 1 — Two-second delay

S80

Multilink PPP: 0 — Disable 1 — Enable (default)

S82

Multilink PPP Endpoint Identifier Class: 1 — Locally Assigned Address 2 — Internet Protocol (IP) Address 3 — IEEE 802.1 Globally Assigned MAC Address 4 — PPP Magic-Number Block 5 — Public Switched Network Directory Number (default)

S83

Multilink PPP Endpoint Identifier (up to 20 characters) By default, telephone number 1 is sent because the endpoint identifier class

is 5. If your endpoint identifier class is not 5, obtain the identifier from your service provider and enter that information in this register.

S84 Challenge Handshake Authentication Protocol (CHAP)

0— Enabled 1— Disabled (default)

S Registers B-7

* The values of these S registers are stored in non-volatile memory and will not be cleared or

returned to the default value if the ISDN modem is powered down.

Result Codes B-8

Result Codes

Table B-3 lists the 3C882 ISDN modem result codes.

Table B-3 3C882 ISDN Modem Result Codes

Short Form Long Form Meaning

0 OK Indicates that the most recent command or

2 RING Indicates that an incoming call is present and no

3 NO CARRIER Indicates that the most recent call attempts did

4 ERROR Indicates that the most recent command or

6 NO DIALTONE Indicates the ISDN line is either down or not

7 BUSY Indicates the latest call attempt did not connect

8 NO ANSWER Indicates the location you are calling is not

5 CONNECT 1200 Indicates 1200 bps serial port connection. 10 CONNECT 2400 Indicates 2400 bps serial port connection. 11 CONNECT 4800 Indicates 4800 bps serial port connection. 12 CONNECT 9600 Indicates 9600 bps serial port connection. 13 CONNECT 7200 Indicates 7200 bps serial port connection. 14 CONNECT 12000 Indicates 12000 bps serial port connection. 15 CONNECT 14400 Indicates 14400 bps serial port connection. 16 CONNECT 19200 Indicates 19200 bps serial port connection. 17 CONNECT 38400 Indicates 38400 bps serial port connection. 18 CONNECT 57600 Indicates 57600 bps serial port connection. 19 CONNECT 115200 Indicates 115200 bps serial port connection. 20 CONNECT 230400 Indicates 230400 bps serial port connection. 56 CARRIER 56000 Indicates 56000 bps ISDN modem connection. 57 CARRIER 56000P Indicates 56000 bps permissive ISDN modem

64 CARRIER 64000 Indicates 64000 bps ISDN modem connection.

action was successfully completed.

AT Answer command is outstanding.

not establish a call or that the physical ISDN interface is not operational.

action was not successfully completed.

initialized.

because the remote destination was busy.

responding.

connection

SPECIFICATIONS

This appendix describes the physical speciﬁcations of the 3C882 ISDN modem and provides the pin assignments of the RS-232 COM port, PC serial cable, and Macintosh serial cable.

3C882 ISDN Modem Speciﬁcations

Network Interface Integrated Ser vices Digital

Network (ISDN) Basic Rate telephone service provided by the telephone company

Physical Interface U (integrated NT1) Physical Dimensions

Length 8.66 in. (22.0 cm.) Width 5.44 in. (13.8 cm.) Height 1.56 in. (4.0 cm.)

Environmental Operating Range

Operating temperature 50˚ to 122˚F (10˚ to 50˚C) Relative humidity Up to 90% noncondensing

Power

Input 110-120 VAC Output 9 VDC

Ringer Equivalence Number (REN)

3 per analog phone port on up to 200 feet of AWG 26 or heavier AWG wiring

EMI Certiﬁcation FCC Part 15, Class B

RS-232 COM Port Pin Specifications C-2

RS-232 COM Por t Pin Speciﬁcations

The asynchronous RS-232-D COM port on the 3C882 ISDN modem, labeled RS-232, is a standard DB-25 female connector. The 3C882 ISDN modem asynchronous port pin assignments, shown in Table C-1, conform to standard deﬁnitions for data communications equipment (DCE).

Table C-1 Pin Descriptions

Pin # Pin Name Signal Direction

1 Shield Ground (GND) — 2 Send Data (SD) To ISDN modem 3 Receive Data (RD) From ISDN modem 4 Request to Send (RTS) To ISDN modem 5 Clear to Send (CTS) From ISDN modem 6 Data Set Ready (DSR) From ISDN modem 7 Signal Ground (GND) — 8 Carrier Detect (DCD) From ISDN modem 18 Local Loopback From ISDN modem 20 Data Terminal Ready

(DTR)

To ISDN modem

21 Remote Loopback To ISDN modem 22 Ring Indicator (RI) From ISDN modem

PC Serial Cable Pin Specifications C-3

PC Serial Cable Pin Speciﬁcations

The DB25 male to DB9 female pin assignments for the PC serial cable are provided in Table C-2.

Table C-2 PC COM Port Cable Pin Assignments

DB9 Pin # Pin Name DB25 Pin #

1 Data Carrier Detect (DCD) 8 2 Receive Data (RD) 3 3 Send Data (SD) 2 4 Data Terminal Ready (DTR) 20 5 Signal Ground (GND) 7 6 Data Set Ready (DSR) 6 7 Request to Send (RTS) 4 8 Clear to Send (CTS) 5 9 Ring Indicator (RI) 22 — Shield 1

Macintosh Serial Cable Pin Speciﬁcations

The DB25 male to 8-pin DIN male pin assignments for the Macintosh serial cable are provided in Table C-3.

Table C-3 Macintosh COM Port Cable Pin Assignments

8 Pin DIN Pin #

1 Data Terminal Ready (DTR) 20, 4 2 Clear to Send (CTS) 5 3 Send Data (SD) 2 4, 8 Signal Ground (GND) 7 5 Receive Data (RD) 3 7 Data Carrier Detect (DCD) 8

Pin Name DB25 Pin #

CONFIGURATION USING DOS

Conﬁguration Using DOS

To conﬁgure the 3C882 ISDN modem for an IBM PC or compatible computer using DOS, follow these steps.

You will need the ISDN Information Sheet you completed in Chapter 1.

1 Create a directory on the hard drive, and then insert the

3ComImpact Windows & DOS Installation Diagnostic Utilities

diskette into the ﬂoppy drive of the PC.

Create a new DOS directory. For example, to create a directory named 3Com on your C drive at the C:\> DOS prompt, type:

md c:\3Com

2 Copy the INSTALL.EXE and README.TXT ﬁles from the

3ComImpact Windows & DOS Installation Diagnostic Utilities diskette to the hard drive.

To copy the INSTALL.EXE ﬁle, at the C:\3Com prompt, type:

copy a:\install.exe

To copy the README.TXT ﬁle, at the C:\3Com prompt, type:

copy a:\readme.txt

3 Execute INSTALL from the hard drive.

At the C:\> DOS prompt, type:

INSTALL

Configuration Using DOS D-2

The conﬁguration program launches and then the Port Settings screen appears. To move the cursor around the screen, use the [Up Arrow] and [Down Arrow] keys. To select a parameter, use the [Space Bar].

4 Use the [Space Bar] to select the 3C882 ISDN modem’s

COM port.

When you select the port, a default standard interrupt (IRQ) associated with that port is automatically chosen.

5 Press [F10] to connect to the 3C882 ISDN modem via the

chosen COM port.

The Conﬁguration screen appears.

6 Select the ISDN switch type.

Your telephone company can provide this information.

7 In the Phone #1 ﬁeld, enter the telephone number to

which your ISDN modem is connected.

8 Enter the corresponding Service Proﬁle Identiﬁer (SPID) in

the SPID #1 ﬁeld for the telephone number you entered in the previous step.

You should have received this SPID from your telephone company.

9 If you have a second telephone number associated with

your ISDN telephone line (some telephone companies require two), enter the number and corresponding SPID in the Phone #2 and SPID #2 ﬁelds.

10 Use the [Space Bar] to select (enable) or unselect (disable)

the MLPPP Enable box.

Multilink PPP combines the ISDN B channels, creating a virtual single digital connection of up to 128 Kbps. Note that the destination you are dialing must also support Multilink PPP, or the dual-channel link will not occur and you will get a single B channel connection.

Configuration Using DOS D-3

11 Specify which Phone port should handle the calls

associated with telephone number one.

If you plan to use the 3C882 ISDN modem’s analog Phone ports, you will want to conﬁgure voice call routing by assigning telephone numbers to the analog ports. By default, calls to and from both ISDN telephone numbers ring the devices connected to both ports simultaneously.

For example, if the ﬁrst telephone number is conﬁgured as 908 555 1212 and only the Phone Port 1 box is checked, then calls to 908 555 1212 will only ring the analog device attached to Phone Port 1.

12 If your ISDN line has two telephone numbers, specify

which Phone port should handle the calls associated with telephone number two.

13 Conﬁrm that the parameters listed in steps 6 through 12

are correct.

When these parameters are updated, the information is read back to the screen. Check to see that the values have been correctly entered.

14 Press [F10] to update the information in the ISDN modem. 15 Press [Esc] to return to the main menu.

Once in the main menu, exit the program. Go to Chapter 5, “Advanced Conﬁguration,” to review the

default settings and ensure that they reﬂect your preferences. If you prefer not to change the default settings, go on to Chapter 6, “Placing and Receiving Calls.”

TECHNICAL SUPPORT

3Com provides easy access to technical support information through the variety of services described in this appendix.

On-line Technical Services

3Com offers worldwide product support seven days a week, 24 hours a day, through the following on-line systems:

■ 3Com Bulletin Board Service (3ComBBS)

■ World Wide Web site

■ 3ComForum on CompuServe®

■ 3ComFacts

3Com Bulletin Board Service

3ComBBS contains patches, software, and drivers for all 3Com products, as well as technical articles. This service is available via modem or ISDN seven days a week, 24 hours a day.

automated fax service

Access by Analog Modem

To reach the ser vice by modem, set your modem to 8 data bits, no parity, and 1 stop bit.

On-line Technical Services E-2

Call the telephone number nearest you:

Country Data Rate Telephone Number

Australia up to 14400 bps (61) (2) 9955 2073 France up to 14400 bps (33) (1) 69 86 69 54 Germany up to 9600 bps (49) (89) 627 32 188 or (49) (89) 627 32 189 Hong Kong up to 14400 bps (852) 2537 5608 Italy (fee required) up to 14400 bps (39) (2) 273 00680 Japan up to 14400 bps (81) (3) 3345 7266 Singapore up to 14400 bps (65) 534 5693 Taiwan up to 14400 bps (886) (2) 377 5840 U.K. up to 28800 bps (44) (1442) 278278 U.S. up to 28800 bps (1) (408) 980 8204

Access by Digital Modem

ISDN users can dial-in to 3ComBBS using a digital modem for fast access up to 56 Kbps. To access 3ComBBS using ISDN, dial the following number:

(408) 654 2703

World Wide Web Site

Access the latest networking information on 3Com’s World Wide Web site by entering our URL into your Internet browser:

http://www.3Com.com/

This service features news and information about 3Com products, customer service and suppor t, 3Com’s latest news releases, selected articles from 3TECH™ (3Com’s award-winning technical journal) and more.

3ComForum on CompuSer ve

3ComForum is a CompuServe-based service containing patches, software, drivers, and technical articles about all 3Com products, as well as a messaging section for peer support. To use 3ComForum, you need a CompuServe account.

To use 3ComForum:

1 Log on to CompuServe.

On-line Technical Services E-3

2 Enter

go threecom .

3 Press [Return] to see the 3ComForum main menu.

3ComFacts Automated Fax Service

3Com Corporation’s interac tive fax service, 3ComFacts, provides data sheets, technical articles, diagrams, and troubleshooting instructions on 3Com products 24 hours a day, seven days a week.

Call 3ComFac ts using your analog touch-tone telephone. International access numbers are:

Country Telephone Number

Hong Kong (852) 2537 5610 U.K. (44) (1442) 278279 U.S. (1) (408) 727 7021

Local analog numbers are:

Country Telephone Number Country Telephone Number

Australia 800 123853 Netherlands 06 0228049 Belgium 0800 71279 Norway 800 11062 Denmark 800 17319 Portugal 0505 442607 Finland 98 001 4444 Russia (Moscow only) 956 0815 France 05 90 81 58 Spain 900 964445 Germany 0130 8180 63 Sweden 020 792954 Italy 1678 99085 U.K. 0800 626403

Support from Your Network Supplier E-4

Support from Your Network Supplier

If additional assistance is required, contact your network supplier. Many suppliers are authorized 3Com service partners who are qualiﬁed to provide a variety of services, including network planning, installation, hardware maintenance, application training, and suppor t services.

When you contact your network supplier for assistance, have the following information ready:

■ Diagnostic error messages

■ A list of system hardware and software, including revision levels

■ Details about recent conﬁguration changes, if applicable

If you are unable to contact your network supplier, see the following section on how to contact 3Com.

Support from 3Com

If you are unable to receive support from your network supplier, technical suppor t contracts are available from 3Com.

In the U.S. and Canada, call (800) 876 3266 for customer service.

Returning Products for Repair

A product sent directly to 3Com for repair must ﬁrst be assigned a Return Materials Authorization (RMA) number. A product sent to 3Com without an RMA number will be returned to the sender unopened, at the sender’s expense.

To obtain an RMA number, call or fax:

Country Telephone Number Fax Number

U.S. and Canada (800) 876 3266 (408) 764 7120

3Com 3C882 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual