3Com TMX 10031161 User manual

http://www.3com.com/
U.S. Robotics®Cable
Modem TMX
Getting Started Guide
Part No. 10031161
Published February 2000

3Com Corporation
3800 Golf Rd.
Rolling Meadows, IL
60008
Copyright © 2000 3Com Corporation. All rights reserved. No part of this documentation may be
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or on the removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to
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UNITED STATES GOVERNMENT LEGEND
If you are a United States government agency, then this documentation and the software described
herein are provided to you subject to the following:
All technical data and computer software are commercial in nature and developed solely at private
expense. Software is delivered as “Commercial Computer Software” as defined in DFARS
252.227-7014 (June 1995) or as a “commercial item” as defined in FA R2.101(a) and as such is
provided with only such rights as are provided in 3Com’s standard commercial license for the Software.
Technical data is provided with limited rights only as provided in DFAR 252.227-7015 (Nov 1995) or FAR
52.227-14 (June 1987), whichever is applicable. You agree not to remove or deface any portion of any
legend provided on any licensed program or documentation contained in, or delivered to you in
conjunction with, this User Guide.
3Com, the 3Com logo, and U.S. Roboticsare registered trademarks and Connections is a trademark of
3Com Corporation.
Microsoft, Windows, and Windows NT are registered trademarks of Microsof tCorporation.
All other company and product names may be trademarks of the respective companies with which they
are associated.

CONTENTS
1BEFORE YOU BEGIN
Introduction 1
Cable Modem TMX Features 1
Contacting Your Broadband Service Provider (BSP) 2
Preparing Your Workspace 3
You Will Need These Items 4
Configuring the TCP/IP Protoco l5
Configuring the TCP/IP Protocol on a Windows P C5
Configuring the TCP/IP Protocol on a Macintosh P C7
2HARDWARE INSTALLATION
Wall-Mount Installation 11
Desktop Installation 13
Stacking Installation with OfficeConnect Products 14
Connecting the Cable Modem to Your Computer 15
3CABLE MODEM CONFIGURATION
Configuring Non-3Com U.S. Robotics Modems for Use with the
TMX 22
Using the Cable Modem TMX 24
Summary of Configuration Software Screens24
Dial/HangUp 25
Rescan Channels 25
Tune Frequency 26
DHCP Configuration 26
Enroll 27
Dial-Up Parameters 28
Dialing Parameters 29
Access Parameters30
DHCP/PPP Parameters 31
Cable Modem Configuration 32
Session Status 33

Message Log 33
Interpreting Your Cable Modem's LED Lights 34
Upgrading to CMX Functionality 35
4TROUBLESHOOTING AND SUPPORT RESOURCES
Troubleshooting 37
The analog modem does not dial my cable company’s server
properly. 37
My computer went into “power save” mode. When it came
out of power save mode, my screen was frozen. 37
I see a delay when loading Web pages or downloading files
(Mac users only). 38
I cannot access the 149.112.50.65 URL after disconnecting
from my BSP .38
The Cable Status LED never stops blinking. 38
Support Resources 38
If You Are Still Having Problems 38
If You Need to Return the Modem to Us 39
World Wide Web 39
90-Day Free Installation Support 39
Technical Support Hotline 39
5REGULATORY INFORMATION AND LIMITED WARRANTY
Manufacturer’s Declaration of Conformity 41
Caution to the User 41
Performance Specifications 41
Export Notices 41
License Agreement 42
Industry Canada (IC) 42
UL Listing/CUL Listing42
Radio and Television Interference 42
3Com Corporation Limited Warranty 43
Hardware 43
Software 44
Year 2000 Warranty 45
Obtaining Warranty Service 45
WARRANTIES EXCLUSIVE 46
LIMITATION OF LIABILITY 47
Disclaimer 47

Governing Law 47
6WALL-MOUNTING T
EMPLATE

1BEFORE YOU BEGIN
Introduction
This guide provides all the information you need to use
your Cable Modem TMX and an analog modem to dial into
one-way Broadband Service Providers (BSPs).
Not all cable companies and BSPs provide two-way service.
In the event that you have a one-way cable provider or BSP,
you need to use an analog modem to send data to the
provider, and then receive data from the provider over the
cable line using a cable modem like the TMX.
BSPs who currently offer one-way service may choose to
upgrade to two-way service at some point in the future.
Your new Cable Modem TMX is software upgradable to
the full operation of the 3Com®U.S. Robotics®Cable
Modem CMX. See the chapter in this guide about two-way
access for more information.
If you purchased the TMX Dialup Kit, the external analog
modem required for dialing into your provider is included.
If you purchased the TMX modem alone, you will need a
compatible external serial analog modem. (This product
will not work with an internal or USB-only analog modem.)
The diagrams and instructions in this guide assume you
have purchased the Dialup Kit.
Installation using a modem other than the one included in
the Dialup Kit should be very similar to the procedures
described in this guide. Consult your analog modem's
documentation for more details concerning its operation
and setup.
Cable Modem TMX Features
■Downstream user data rates of up to 38 Mbps
(megabits per second), faster than 56K analog
modems, ISDN, or ADSL

2CHAPTER 1: BEFORE YOU BEGIN
■Plug and play operation ensures easy setup and
installation
■3Com’s extensive user support organizations and our
5-year limited warranty
* Please note that the following factors affect the
speeds you may experience:
■Your computer equipment and configuration,
including the speed of your processor, the amount
of RAM on your system, and your available hard disk
space.
■The Internet browsing, e-mail, or other programs
you run at the same time, which use your
computer’s resources.
■The capacity of the Internet service you order from
your provider.
■Changing network traffic levels depending on when
you go online.
Contacting Your Broadband Service Provider (BSP)
In order to use your cable modem, you need to establish an
Internet access account with your local BSP. Before
contacting your BSP to establish an account, have the
following information handy:
■The modem’s Media Access Control (MAC) address
(located on a bar code sticker on the back of the
modem). The MAC address consists of 12 characters
preceded by the text EA =. In the following example
label image, the
MAC address is 00104B377410. Write the MAC
address in the blank provided below.

Preparing Your Workspace 3
■The modem’s model number (located on a sticker on
the bottom of the modem).
MAC address: EA = __________________
Model number: 3CR292B-TR56
You should now contact your BSP and verify the following:
■You have cable service to your home that supports
cable modem access. If your BSP does not provide
cable modem access, the 3Com U.S. Robotics Cable
Modem TMX will not be able to communicate with your
BSP’s Internet access service. Visit the following URL for
additional information:
http://www.3com.com/cablemodem
■Your BSP has set up your cable Internet access
account. Your BSP will establish an Internet access
account that will allow you to send and receive e-mail,
access the World Wide Web, and receive other Internet
services. This account must be established before you
can use your cable modem.
■You have a cable line near your PC and it has been
prepared for cable modem service. If you do not
have a cable line in your home that supports cable
modem access or if your current cable connection is not
conveniently located near your computer, your cable
company can install one. If you use your cable line for
cable television access, your cable company can also
install an additional line for use with your cable modem.
Preparing Your Workspace
■Position your computer so that it is located near your
cable outlet.
■The cable modem should be located near your
computer and the cable outlet. There should be plenty
of room to guide the cables away from the modem
without crimping the cables.
■The modem should be located where it has ample space
to allow constant airflow around the unit.

4CHAPTER 1: BEFORE YOU BEGIN
■Do not stack anything on top of the cable modem. (See
the instructions on page 14 concerning stacking this
modem with 3Com OfficeConnect products.)
■The temperature in the room where the cable modem
will be operating should be between 0 and 40°C (32
and 104°F). Relative humidity should be between 5 and
95%, non-condensing.
■Familiarize yourself with all of the materials in this box.
Please read these installation instructions thoroughly
before installing your cable modem.
CAUTION: Your cable company will provide a cable
connection. Do not attempt any rewiring without first
contacting your cable company.
You Will Need These Items
Included:
■Cable modem
■Cable modem power supply
■Analog modem, power supply, and DB-25 to DB-9 cable
(TMX Dialup Kit only)
■RJ-45 network cable
■Rubber feet and stacking clips kit
■This Getting Started Guide
Not Included:
■A PC running Windows95 operating system (or later)
or a Macintoshcomputer running the System 7.5
operating system (or later) with TCP/IP protocol installed
(see the following two sections for more information on
installing TCP/IP)
■An active cable line
■An active Ethernet port or network interface card (NIC)
installed in your computer
■A 7/16 inch (or adjustable) wrench for securing the
cable line to the modem
■A screwdriver, pushpins, and screws (for optional
wall-mounting) The screw heads should be at least 0.2”
(5mm) in diameter for them to be properly captured in