USRobotics 3Com User Manual

56K Modem

User’s Guide & Reference

This manual covers installation and operating instructions for:

3Com U.S. Robotics Modems

3Com, the 3Com logo, and U.S. Robotics, are registered trademarks of 3Com
Corporation or its subsidiaries. Windows is a registered trademark of Microsoft Corp. Any
other trademarks, trade names or service marks used in this manual are the property of
their respective owners.

Copyright © 2000 3Com Corporation or its subsidiaries
3800 West Golf Road
Rolling Meadows, IL 60008

All Rights Reserved
*IMPORTANT! In accordance with the ITU standard for 56K transmissions (V.90), this modem is capable of

56 Kbps downloads. However, due to FCC rules which restrict power output of the service providers’
modems, current download speeds are limited to 53 Kbps. Actual speeds may vary depending on line
conditions and other factors. Uploads from users to server equipment travel at speeds up to 31.2 Kbps. An
analog phone line compatible with the V.90 standard and an Internet provider or corporate host site
compatible with the V.90 standard are necessary for these high-speed downloads.

See http://www.3com.com/56k for details.

PRODUCT DISCLAIMER

This manual covers features that may or may not be present on your modem. Please consult your
computer manufacturer’s documentation for a list of your modem’s supported features.

For service and repair issues, contact your computer system manufacturer.

DOS BOX SUPPORT

The DOS Box allows DOS-based communications applications to work in a Windows environment.
DOS compatibility is accomplished with TurboCom ViP® by Pacific CommWare, Inc. of Ashland,

Oregon.

TurboCom Copyright © 1991-1996 Pacific CommWare. Inc.

TABLE OF CONTENTS

Product Features 1
Voice Product Features 2
Installing the Modem 3

Installing Modem Drivers for Windows 98 Second Edition
Installing Modem Drivers for Windows Millennium Edition (Me)
Installing Modem Drivers for Windows NT 4.0
Installing Modem Drivers for Windows 2000

Technical Reference 8
Regulatory Information 13

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5
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PRODUCT FEATURES

Modulation Schemes

ITU-T V.90
ITU-T V.34+
ITU-T V.32bis
ITU-T V.32
ITU-T V.22bis
ITU-T V.22
ITU-T V.23
Bell 212A
ITU-T V.21
Bell 103

Error Control and Data
Compression Schemes

ITU-T V.42
MNP 2-4
ITU-T V.42bis
MNP 5

Embedded Control

V.80

Fax Modulation Schemes

ITU-T Group 3 Fax
ITU-T V.17
ITU-T V.29
ITU-T V.27ter

Fax Standards

EIA 578 Class 1 FAX
EIA 592 Class 2.0 FAX

Front Channel Link Rates

28000, 29333, 30666, 32000,
33333, 34666, 36000, 37333,
38666, 40000, 41333, 42666,
44000, 45333, 46666, 48000,
49333, 50666, 52000, 53333,
54666, 56000, 57333

Back Channel Link Rates

4800, 7200, 9600, 12000,
14400, 16800, 19200, 21600,
24000, 26400, 28800, 31200

V.34+ Link Rates

4800, 7200, 9600, 12000,
14400, 16800, 19200, 21600,
24000, 26400, 28800, 31200,
33600

V.32bis Link Rates

4800, 7200, 9600, 12000,
14400

Additional Link Rates

300, 1200/75 (V.23), 1200,
2400

Fax Link Rates

2400, 4800, 7200, 9600,
12000, 14400

1

VOICE PRODUCT FEATURES

If your modem has voice capabilities, the following information will apply:

Speakerphone

With the addition of a microphone, a set of external, powered speakers, and the appropriate software, your
new voice modem provides all the convenience of a full-duplex speak erphone. Unlike many half-duplex
speakerphones, your modem allows you to converse normally without annoying echoes and distortion.
Simply plug the speakers into the jack on the modem identified with the and the microphone into the

jack with the icon and you are ready to go.

For voice enabled modems that do not have audio connectors on the bracket, you will have to connect your
modem to the sound card via the 4-pin connector which is found on the modem card.

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