3Com 2940, 2941 User manual

This manual covers installation and operating instructions for the following 3Com®modems:

U.S. Robotics®Cable Modem CMX 3CR292-DE56 (model 2940)

U.S. Robotics®Cable Modem CMX 3CR292-DE40 (model 2941)

3Com, the 3Com logo, U.S. Robotics, the U.S. Robotics logo, EtherLink, and OfficeConnect

are registered trademarks and Connections is a trademark of 3Com Corporation. Windows is a

registered trademark of Microsoft Corp. Macintosh is a registered trademark of Apple

Computer, Inc. Any other trademarks, trade names, or service marks used in this manual are the

property of their respective owners.

3800 Golf Road

Rolling Meadows, IL 60008

TABLE OF CONTENTS

Introduction 1

Cable Modem Features 1

Before You Begin 3

Contacting Your Local Cable Company 3

Preparing Your Workspace 5

You Will Need These Items 5

Configuring the TCP/IP Protocol on a Windows PC 6

Configuring the TCP/IP Protocol on a Macintosh PC 8

Hardware and Software Installation 11

Wall-Mount Installation 11

Desktop Installation 13

OfficeConnectStackingInstallation 13

Connecting the Cable Modem to Your Computer 15

Installingthe CableConnectionsCD-ROM 18

Cable Modem Operation 19

Troubleshooting and Support Resources 23

Support Resources 25

If You Are Still Having Problems 26

If You Need to Return the Modem to Us 26

Regulatory Information and Limited Warranty 29

Manufacturer’s Declaration of Conformity 29

3Com Corporation Limited Warranty 32

INTRODUCTION

Congratulations! You have just purchased a

modem that features a pioneering new

technology. 3Com, a leader in networking

and data access, is proud to offer you this

technology that makes Internet access

possible at speeds previously only

imagined!

This external cable modem is one part of a

comprehensive communications system that

utilizes the cable television network to

deliver high-speed data to your computer.

Data is requested and sent over the cable

television network at burst rates of up to 38

megabits per second (Mbps).

Cable Modem Features

•User data rates of up to 3000K,* faster

than 56K analog modems, ISDN, or

ADSL

•Two-way design means that the CMX

sends and receives data over the cable

line (unlike one-way modems, which

require an analog modem for upstream

data)

•Plug and play operation ensures easy

setup and installation

•DOCSIS-compliant for interoperability

with cable operators

•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

NTRODUCTION

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 when you go online.

BEFORE YOU BEGIN

This chapter explains how to prepare your

computer system for cable modem

installation.

Contacting Your Local Cable

Company

In order to use your cable modem, you need

to establish an Internet access account with

your local cable company. Before

contacting your cable company 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.

•The modem’s model number (located

on a sticker on the bottom of the

modem). Your modem’s model number

will be 2940 or 2941.

MAC address: EA = __________________

Model number (circle one): 2940 or 2941

EFORE

EGIN

You should now contact your local cable

company and verify the following:

•You have cable service to your home

that supports two-way cable modem

access. If your cable company does not

provide two-way service, the

U.S. Robotics Cable Modem CMX will

not be able to communicate with your

cable company’s Internet access service.

You should immediately consult your

cable company and place of purchase to

determine the proper U.S. Robotics

cable modem that will work with your

cable company. You can also visit the

following URL for additional

information:

http://www.3com.com/cablemodem

•Your cable company has set up your

cable Internet access account. Your

cable company 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

two-way 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.

EFORE

EGIN

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.

•Do not stack anything on top of the cable

modem. (See the instructions on page 13

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

•RJ-45 network cable

•Rubber feet and stacking clips kit

•Cable ConnectionsCD-ROM

EFORE

EGIN

•Fold-out Quick Installation Guide

•This User’s Guide & Reference

Not Included:

•A PC running Windows95 (or later)

or a Macintoshrunning System 7.5 (or

later) with TCP/IP protocol installed

(see the following two sections for more

information on installing TCP/IP)

•An active two-way 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 the slot. If you are using

wood screws, use #6 pan heads or

equivalent.

Configuring the TCP/IP

Protocol on a Windows PC

If you have a PC running Windows 95 or

later, you need to make sure the TCP/IP

communications protocol is installed on

your system before you install your cable

modem. The listing of actual components

installed on your PC depends on the

hardware installed in your computer. The

installation example in this guide assumes a

3Com EtherLinkIII 3C509B-TPO NIC

has been installed and the screen images

shown below reflect this hardware

configuration. Other networking cards will

work but the screen images will look

somewhat different.

EFORE

EGIN

NOTE: If you need to install a

network interface card to give your

computer Ethernet capability but have

not yet done so, perform this operation

first by consulting your NIC installation

manual and then return here to

complete installation of the TCP/IP

software.

1. Click Start, point to Settings, and then

click Control Panel.

2. Double-click the Network icon.

3. A list of installed network components

appears. Look for an entry that includes

TCP/IP -> followed by the NIC

hardware device installed in your

computer. (The entry for the 3C509B-

TPO example is shown in the following

screen image).

If an entry similar to this is present, go to

step 9 on the next page.

4. If a similar entry is not present, click

Add...

5. Click Protocol, and then click Add...

6. Click Microsoft in the “Manufacturers:”

list and then click TCP/IP in the

“Network Protocols:” list. Click OK.

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