3com 3CR29210 User Manual

OfficeConnect Cable
Modem External
Getting Started Guide

http://www.3com.com/

Part No. 10042862
Published January 2001

3Com Corporation
3800 Golf Rd.
Rolling Meadows, IL
60008

Copyright © 2000 3Com Corporation. All rights reserved. No part 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 written 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.

If there is any software on removable media described in this documentation, it is furnished under a
license agreement included with the product as a separate document, in the hard copy documentation,
or on the removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to
locate a copy, please contact 3Com and a copy will be provided to you.

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 FAR 2.101(a) and as such is
provided with only such rights as are provided in 3Com’s standard commercial license for the Software.
T echnical 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, EtherLink, and OfficeConnect are registered trademarks and Connections is a
trademark of 3Com Corporation.

Microsoft, Windows, and Windows NT are registered trademarks of Microsoft Corporation.
All other company and product names may be trademarks of the respective companies with which they

are associated.
All specifications are subject to change without notice.

CONTENTS

1 BEFORE YOU BEGIN

Introduction 1
Conventions 1
Cable Modem Features 1
Contacting Your Local Cable Provider 2
Preparing Your Workspace 4
You Will Need These Items 4

3Com-Supplied Items 4
Customer- and Service Provider-Supplied Items 5

Configuring the TCP/IP Protocol 5

Configuring the TCP/IP Protocol on a Windows PC 5
Configuring the TCP/IP Protocol on a Macintosh 7

2 HARDWARE AND SOFTWARE INSTALLATION

Connecting the Cable Modem to Your Computer 11

Ethernet Installation 12
USB Installation 12

Windows 98 Operating System 12
Windows Me Operating System 16

Windows 2000 Operating System 20
Wall-Mount Installation 23
Desktop Installation 24
OfficeConnect Stacking Installation 25
Installing the Cable Connections
Connection Illustration 26

TM

CD-ROM 25

3 CABLE MODEM OPERATION

Cable Modem Operation Overview 27
Interpreting the LEDs on the Front of Your Cable Modem 27
Connectors and Switches on the Back of Your Cable

Modem 29

4 TROUBLESHOOTING AND SUPPORT RESOURCES

Troubleshooting 31

I cannot access my e-mail or Internet service. 31
The Cable Status LED never stops blinking. 32
All of the LEDs on the front of my cable modem look right,

but I still cannot access the Internet. 32
The power on my cable modem goes on and off sporadically.

The Cable Modem Status light never stops blinking. 33

Support Resources 33

World Wide Web 33
90-Day Free Installation Support 33
Technical Support Hotline 34
If You Are Still Having Problems 34
If You Need to Return the Cable Modem to 3Com 34

5 REGULATORY INFORMATION AND LIMITED WARRANTY

Manufacturer's Declaration of Conformity 37

Part 15 37
FCC Class B Statement 37
FCC Notice: Radio and Television Interference 37
Caution to the User 38
Performance Specifications 38
Export Notices 39
License Agreement 39
Industry Canada (IC) 39
UL Listing/CUL Listing 39
Radio and Television Interference 40
VCCI Statement 41

3Com Corporation Limited Warranty 41

Hardware 41
Software 41
Year 2000 Warranty 42
Obtaining Warranty Service 43
WARRANTIES EXCLUSIVE 43
LIMITATION OF LIABILITY 44
Disclaimer 44
Governing Law 45

6 MOUNTING TEMPLATE

1

Introduction

You have just purchased a cable modem featuring a
pioneering new technology, making Internet access
possible at speeds previously only imagined. This external
cable modem is one part of a comprehensive
communications system that uses the cable television
network to deliver high-speed data to your computer. Data
is requested and sent over the cable television network at
up to 38 megabits per second (Mbps). (Actual speeds will
vary depending on your computer hardware, applications,
the service offered by your cable service provider, and
network traffic. This chapter explains how to prepare your
computer system for cable modem installation.

Conventions

This table lists the conventions used in this guide.

BEFORE YOU BEGIN

Icon Notice Type Description

Information note Important featu res or instructions

Caution Information to alert you to potential damage to

Warning Information to alert you to potential personal

a program, system, or device

injury

Cable Modem Features

Your new cable modem has these features:

■ Cable line band wi dth a ll ows u ser d ata rat es of up to 3 8

megabits per second (Mbps) downstream,* faster than
56K analog modems, ISDN, or ADSL.

2 CHAPTER 1: BEFORE YOU BEGIN

■ You can use the Ethernet connection and USB

connection at the same time, allowing you to connect
to the Internet using your computer and another
Internet device at the same time.

■ Two-way design means that the cable modem sends

and receives data over the cable line (unlike one-way
cable modems, which require an analog modem for
upstream data).

■ Plug and Play operation ensures easy set up and

installation.

■ DOCSIS-compliance ensures interoperability with

DOCSIS-compliant cable suppliers.

■ 3Com’s extensive technical support organization

provides you with the quick answers you need to
connect to the Internet.

* NOTE: Please note that the following factors affect the
speeds you may experience: (1) your computer equipment
and configuration, including the speed of your processor,
the amount of RAM on your system, and your available
hard disk space; (2) applications running simultaneously
with the cable modem which use varying amounts of your
computer’s resources; (3) the capacity of the Internet
service you order from your provider; (4) changing network
traffic levels depending when you go online.

Contacting Your Local Cable Provider

To use your cable modem, you first must have your service
provider set up an Internet access account for you. Before
contacting your cable provider to set up an account, have
the following informa tion ha ndy:

■ The cable modem’s hardware revision, software

revision, Ethernet address, and USB address are located
on a bar code sticker on the back of the cable modem.
Write these numbers in the following blanks.

Contacting Your Local Cable Provider 3

■ Hardware revision: __________________

Software revision: __________________
Manufacturing date: __________________
Ethernet address: __________________
USB address: __________________

Now contact your local cable provider and verify this
information:

1 The cable service to your home supports two-way cable

modem access.

If your cable company does not provide two-way service,
this cable modem cannot communicate with your cable
company’s Internet access service. You should immediately
consult your cable company and place of purchase to
determine which 3Com cable modem to use. You can also
visit the following URL for additional information:

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

2 Your cable provider has set up your cable Internet access

account. This Internet access account enables you to send
and receive e-mail, access the World Wide Web, and
receive other Internet services. This account must be set up
before you can use your cable modem.

3 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 acce ss, or if your current cable connection is not
conveniently located near your computer, your cable
provider can install one. If you use your current cable line
for cable television access, your cable company can also
install an additiona l lin e fo r use wit h your cable mode m.

4 CHAPTER 1: BEFORE YOU BEGIN

Preparing Your Workspace

Before installing the cable modem you should prepare your
workspace.

Before installing the modem:

■ Position your computer and cable modem so that they

are located near your cable outlet.

■ Allow plenty of r oom to guide th e cables away f r om the

cable modem without crimping them.

■ Allow for airflow around the cable modem.

■ Do not stack anything on top of the cable modem. (See

the instructions on page 25 concerning stacki ng this
cable modem with other 3Com OfficeConnect
products.)

■ Ver ify that the temper ature in the room wher e the cable

modem will be operating is betwe en 0 and 40°C (32
and 104°F). Relative humidity must be between 5% and
95%, non-condensing.

■ Familiarize yourself with all of the materials supplied

with the cable modem. Please read these installation
instructions thoroughly before installing the cable
modem.

CAUTION: Your cable provider provides a cable connection.
Do not attempt any rewiring without first contacting your
cable provider.

®

You Will Need These Items

When you install the cable modem, you will need items
from the following lists.

3Com-Supplied Items

Verify that these items were included in the box containing
your cable modem:

■ Cable modem

■ Cable modem power supply

■ RJ-45 network cable

■ USB cable

■ Rubber feet

Configuring the TCP/I P Pr ot ocol 5

■ Cable Connections

■ This Getting Started Guide

TM

CD-ROM

Customer- and Service Provider-Supplied Items

Verify that you have these items available:

■ FOR ETHERNET INSTALLATI ON:

■ A PC running Windows

®

95 operating system (or

later)

■ A Macintosh

®

computer running System 7.5 (or

later)

■ A network interface card (NIC) or active Ethernet

port

■ FOR USB INSTALLATION:

■ A PC running Windows 98 operating system (or

later)

■ An active USB port installed in your computer

■ TCP/IP protocol installed (see “Configuring the TCP/IP

Protocol” for more information on installing TCP/IP)

■ An active two-way cable line

■ An adjustable wrench for securing the cable line to the

cable modem

■ A screwdriver, drawing pins, and screws (for optional

wall-mounting). The screw heads should be at least
5mm in diameter s o that they fit pr ope rly in t he slot and
fasten the cable modem securely to the wall.

Configuring the TCP/I P Protoc ol

Y o u must h ave th e TCP/IP pro tocol in stalle d and c onfig ure d
on your computer so that the cable modem can connect to
your broadband Internet service.

NOTE: If you are using a Macintosh computer, see the
instructions on page 7.

Configuring the TCP/IP Protocol on a Windows PC

You need to make sure that either an active Ethernet port,
Ethernet network interface card (NIC), or an active USB
port and the TCP/IP communications protocol are installed
on your system before you install your cable modem.

6 CHAPTER 1: BEFORE YOU BEGIN

To configure TCP/IP on a Windows PC:

1 Right-click the Network Neighborhood icon on your

desktop and then click Properties.

2 A list of installed network components appears. Look for

the TCP/IP entry. The TCP/IP entry might be followed by an
arrow and a description of the NIC hardware device or USB
network interface installed in your computer. If an entry
similar to this is present, go to step 9.

.

3 If a similar TCP/IP entry is not present, click Add...
4 Click Protocol, and then click Add...
5 Click Microsoft in the Manufacturers: list.
6 Click TCP/IP in the Network Protocols: list. Click OK.

7 “TCP/IP” appears in the list of available network

components. Click OK.

Configuring the TCP/I P Pr ot ocol 7

8 Windows asks you if you would like to restart your

computer. Click No.

9 Right-click the Network Neighborhood icon on your

desktop.

10 Click Properties in the drop-down menu that appears.
11 Double-click the TCP/IP --> entry in the Configuration

menu.

12 Click the Advanced t ab and then m ake sur e the bo x next to

Set this protocol to be the default protocol. is checked. If it
is not checked, click th e box to put a check in it. (If this
option is grayed out, you do not have TCP/IP installed
properly.)

13 Click OK and then click OK again.
14 Click Windows Start and click Run.
15 When the Run screen appears, type

winipcfg in the Text

field and click OK.

16 The IP Configur at io n screen ap pe ar s. Cl ic k Release. A line

of zeros appears in the IP Address and Subnet Mask fields.

17 Click Renew. Numbers replace the zeros. Click OK and turn

to “Hardware and Software Installation” page 11.

NOTE: The numbers on your screen should be dif f ere nt
than those shown in the example above.

Configuring the TCP/IP Protocol on a Macintosh

Before you install your cable modem, you must verify that
the TCP/IP communications protocol and an Ethernet

8 CHAPTER 1: BEFORE YOU BEGIN

device are installed on your system. Many Macintosh
computers have Ethernet devices installed at the factory.

To configure TCP/IP on a Macintosh:

1 Click the Apple® icon in the Finder™ and select Control

Panels and then TCP/IP.

The TCP/IP screen appears.

2 Click Edit in the Finder, and select User Mode....

The User Mode screen appears.

3 Select Advanced, and then click OK.

The TCP/IP screen appears.

Configuring the TCP/I P Pr ot ocol 9

4 Click the selector arrows to the right of the Configure: drop

down menu and select Using DHCP Server. Then click

Options....

The TCP/IP Options screen appears.

Note: In some cases, the Load only when needed checkbox
does not appear. If it is visible, make sure that the box is
not checked. If a check mark appears in the box, click the
box to remov e it .

5 Select Active and click OK.
6 Verify that the Use 802.3 checkbox (circled in the image

below) is unchecked. If the box is checked, click the box to
remove the check mar k. Then click Info.

10 CHAPTER 1: BEFORE YOU BEGIN

7 Ensure there is an address listed in the Hardware address:

field, and click OK. If you have made any changes, you are
prompted to save the se ttings. Click OK to save the settings
and exit.

HARDWARE AND

2

S

OFTWARE INSTALLATION

NOTE: Before installing your cable modem, write its serial
number in the space provided below. The serial number is
located on the cable modem’s box. It begins with “HBPK”
followed by the last 6 digits of your Ethernet address. (The
complete Ethernet address is located on the white sticker
on the back of the cable modem.) If you need to call our
customer support line, a representative will ask you for this
serial number to help identify your cable modem.

Serial number: HBPK_________________

Before you begin installing the cable modem hardware,
you need to determine how you would like to fit the cable
modem into your work environment. There are three
installation options:

■ Wall-mount installation (page 23)

■ Desktop installation ( page 24)

■ Stacking installation (page 25)

Connecting the Cabl e M od e m to Your Com p uter

Connect the cable modem to your computer and cable
outlet before you install the cable modem software drivers.
You can have the Ethernet cable and the USB cable
connected to the cable modem and computer at the same
time.

TIP: Before you unplug any computer cables, label them or
make a sketch of how they are connected. This can be
helpful when you plug them back in later.

CAUTION: To avoid risk of electric shock, make sure your
computer and all peripheral devices are turned off and
unplugged from electrica l outle t s.

NOTE: Refer to the illustration on page 26 while
connecting the cable modem to your computer.

12 CHAPTER 2: HARDWARE AND SOFTWARE INSTALLATION

Ethernet Ins tallation

Your cable modem supports Ethernet service.To install the
cable modem using an Ethernet connection:

1 Connect the cable line to the cable modem’s CATV cable

connector. Be careful not to bend the wire in the center of
the cable line when you connect it to the cable modem.

2 After hand-tightening the CATV cable connector, use an

adjustable wrench (not included) to firmly tighten it. Be
careful not to over-tighten the connector or you may
damage either the connector or the cable modem. If you
plan to have the cable line connected to a television as well
as the cable modem, you will need a cable line splitter (not
included).

3 Plug one end of the RJ-45 network cable into the cable

modem’s RJ-45 jack and the ca ble’s other end into the
existing network interface card installed in your computer.

4 Plug the cable modem’s power adapte r into a wall outlet or

surge protector and into the cable modem’s power jack.

5 Power on the computer.

USB Installation

Y our cable modem supports USB service.To install the cable
modem usin g a US B co nne cti on, f oll ow t he i nstru cti ons for
your operating system.

Windows 98 Operating System

To use the USB port with Windows 98:

1 Make the following connections:

a Connect the cable line to the cable modem’s CATV cabl e

connector. Be careful not to bend the wire in the center
of the cable line when you connect it to the cabl e
modem.

b A fter ha nd-tig htenin g the CATV cable connect or, use an

adjustable wrench (not included) to firmly tighten it. Be
careful not to over-tighten the connector or you may
damage either the connector or the cable modem. If
you plan to have the cable line connected to a television

Connecting the Cable Modem to Your Computer 13

as well as the cable modem, you will need a cable line
splitter (not included).

c Connect one end of the USB cable line to the cable

modem’s USB port and the other end to the USB port on
the computer.

d Plug the cable modem’s power adapter into a wall outlet

or surge protector and into the cable modem’s power
jack.

2 Power on the computer.

Windows detects the cable modem. The Found New
Hardware screen appears.

3 When the Add New Hardware Wizard screen appears,

insert the Cable Connections CD into the computer’s
CD-ROM drive.

4 Click Next.
5 Select Search for the best driver for your device.

(Recommended) and click Next.

6 Check the CD-ROM drive check box and click Next to

search for the necessary driver files.

14 CHAPTER 2: HARDWARE AND SOFTWARE INSTALLATION

7 If Windows finds an updated driver, select The updated

driver (Recommended) and click Next.

8 Click Next. The computer automatically copies the

necessary driver files from the CD.
The computer finishes copying the driver files and prompts

you to insert the Windows 98 CD into the CD-ROM drive.

9 Insert the Windows 98 CD and click OK.

If the Copying Files dialog box appears, make sure that you
have inserted the correct CD and that you have pointed it
to the correct path. After you point th e Add New Hardware
Wizard to the correct path, click OK.

Connecting the Cable Modem to Your Computer 15

The computer automatically copies the necessary system
files.

10 Click Finish after the computer has copied the necessary

files.
The System Settings Change dialog box appears.

11 Click Yes to restart the computer.
12 Verify that the cable modem is operating properly. To do

this, watch the cable modem Link Status and Power LEDs;
when they are solid green, the cable modem is ready for
use.

If you are powering up the cable modem for the first time,
allow 15 minutes for this process to finish.

16 CHAPTER 2: HARDWARE AND SOFTWARE INSTALLATION

Uninstalling the Cable Modem Software Drivers
(Windows 98 Operating System Only)

To uninstall the cable modem:

1 Close all open applications.
2 Click Windows Start and select Settings.
3 Click Control Panel.
4 Double-click Add/Remove Programs .
5 Select 3Com OfficeConnect Cable Modem. Make sure you

have selected the software you want to delete. If you
accidentally select the wrong software and click
Add/Remove, Windows deletes the software and you will
have to re-install it.

6 Click Add/Remove. The system removes the 3Com

OfficeConnect Cable Modem software.

7 The system prompts you to restart the computer. Click Yes.
8 Click Windows Start, then click Shut Down.
9 Select Restart the Computer and click Yes to restart the

computer.

Windows Me Operating System

To use the USB port with Windows Me:

1 Use the illustration on page 27 as a guide to make the

following connections:
a Connect the cable line to the cable modem’s CATV cabl e

connector. Be careful not to bend the wire in the center
of the cable line when you connect it to the cabl e
modem. After hand-tightening the CATV cable
connector, use the adjustable wrench to fir mly tighten it.
Be careful not to over-tighten the connector or you may
damage either the connector or the cable modem. If
you plan to have the cable line connected to a television
as well as the cable modem, you will need a cable line
splitter (not included).

b Connect the USB cable line to the cable modem’s USB

port and to the USB port on the computer.

Connecting the Cable Modem to Your Computer 17

c Plug the cable modem’s power adapter into a wall outlet

or surge protector and into the cable modem’s power
jack.

2 Power on the computer.

Windows detects the cable modem. The Found New
Hardware screen appears.

3 When the Add New Hardware Wizard screen appears,

insert the Cable Connections CD into the computer’s
CD-ROM drive.

4 Select Automatic search for a better driver (Rec ommended)

and click Next.

18 CHAPTER 2: HARDWARE AND SOFTWARE INSTALLATION

5 The computer automatically copies the necessary driver

files from the CD.

6 Click Finish after the computer has copied the necessary

files.

The System Settings Change dialog box opens.

7 Click Yes to restart the computer.
8 Verify that the cable modem is operating properly. When

the modem is operating properly, the cable modem Link
Status and Power LEDs are lighted a solid green.

Connecting the Cable Modem to Your Computer 19

If you are powering up the cable modem for the first time,
allow 15 minutes for this process to finish.

Uninstalling the Cable Modem (Windows Me
Operating System Only)

To uninstall the cable modem:

1 Close all open applications.
2 Click Windows Start and select Settings.
3 Click Control Panel.
4 Double-click Add/Remove Programs .

5 Select 3Com HomeConnect Cable Modem External with

USB. Make sure you have selected the software you want
to delete. If you accidentally select the wrong software and
click Add/Remove, Windows deletes the software and you
will have to re-install it.

6 Click Add/Remove. The system removes the 3Com

HomeConnect Cable Modem software.

7 The system prompts you to restart the computer. Click Yes.
8 Click Windows Start, then click Shut Down.

20 CHAPTER 2: HARDWARE AND SOFTWARE INSTALLATION

Select Restart the Computer and click Yes to restart the
computer.

Windows 2000 Operating System

To use the USB port with Windows 2000:

1 Make the following connections:

a Connect the cable line to the cable modem’s CATV cabl e

connector. Be careful not to bend the wire in the center
of the cable line when you connect it to the cabl e
modem.

b A fter ha nd-tig htenin g the CATV cable connect or, use an

adjustable wrench (not included) to firmly tighten it. Be
careful not to over-tighten the connector or you might
damage either the connector or the cable modem. If
you plan to have the cable line connected to a television
as well as the cable modem, you will need a cable line
splitter (not included).

c Connect one end of the USB cable line to the cable

modem’s USB port and the other end to the computer’s
USB port.

d Plug the cable modem’s power adapter into a wall outlet

or surge protector and into the cable modem’s power
jack.

2 Power on the computer.

The Found New Hardware Wizard screen appears.

Connecting the Cable Modem to Your Computer 21

3 Insert the included Cable Connections CD into the

CD-ROM drive and Click Next.

4 Select Search for a suitable driver for my device

(recommended) and click Next.

5 Check the CD-ROM drives check box and click Next to

search for the necessary driver files.

6 The Found New Hardware Wizard displays the search

results. Click Next to install the driver files for the cable
modem.

22 CHAPTER 2: HARDWARE AND SOFTWARE INSTALLATION

7 The Found New Hardware Wizard completes the driver

installation. Click Finish to close the Found New Hardware
Wizard.

8 Verify that the cable modem is operating properly. To do

this, watch the cable modem Link Status and Power LEDs;
when they are solid green, the cable modem is ready for
use.

If you are powering up the cable modem for the first time,
allow 15 minutes for this process to finish.

Uninstalling the Cable Modem (Windows 2000
Operating System Only)

To uninstall the cable modem while using Windows 2000:

1 Close all open applications.
2 Click Windows Start.
3 Select Settings.
4 Click Control Panel.
5 Double-click Add/Remove Programs . The Add/Remove

Hardware Wizard screen appears.

6 Click Next.
7 Select Uninstall/Unplug a device and click Next.
8 Select Uninstall a device. Choose this option to

permanently uninstall a device and its driver.

9 Click Next.
10 Select 3Com OfficeConnect Cable Modem and click Next.
11 Verify that you have selected 3Com OfficeConnect Cable

Modem then select Yes, I want to uninstall this device.

12 Click Next.
13 Click Finish when Windows informs you that it has

successfully uninstalled the selected device.

Wall-Mount Installation

The bottom panel of the cable modem has two raised
brackets with slots, as shown in the following illustration,
which enable you to mount the cable modem to a wall.

mounting

holes

Wall-Mount Installation 23

®

These slots fit over the heads of wall-mounting screws to
secure the cable modem to the wall. A mounting template
for marking the location of the mounting screws is
included at the back of this guide.

1 Remove the mounting template from the back of this

guide.

2 Place the mounting template against the wall at the

location chosen for the cab le modem. T he templa te should
be parallel to and at least 50 cm (20 in.) above the floor.
Insert drawing pins through the template cross hairs into
the wall to mark the locations for the screws.

3 Secure the mounting screws into the wall. Do not drive the

screws flush to the wall. Th e scr ew heads sh ould be at least
6 mm away from the wall so the screws can lock into the
slots on the cable modem’s case.

4 Fit the slots over the scr ew h ead s and let the cabl e mod em

slide down into position.

24 CHAPTER 2: HARDWARE AND SOFTWARE INSTALLATION

.

plate

ounting Tem

plete instructions, see the

20"

User's Guide & Reference

®

INSTRUCTIONS FOR WALL-MOUNTING THE CABLE MODEM

Wall-m
See other side for basic instructions.
For com

[ 50 cm ]

5 Turn to “Installing the Cable ConnectionsTM CD-ROM” on

page 25.

Desktop Inst a l la tion

If you plan to place your cable modem on a flat surface,
you can use the four self-adhesive rubber feet supplied
with your cable modem to prevent your cable modem from
sliding.

OfficeConn ect Stacking Installation 25

To attach the rubber feet:

1 Separate the rubber feet.
2 Remove the paper backing.
3 Attach the rubber feet to the marked areas at each corner

of the underside of your cable modem.

OfficeConnect Stacking Installation

If you already own 3Com OfficeConnect products, you can
use the four stacking clips supplied with those products to
neatly and securely stack your cable modem with the other
OfficeConnect products. Refer to your OfficeConnect
documentation for details.

Installing the Cable ConnectionsTM CD-ROM

You do not need to install the included Cable Connections
CD to use your cable modem, but the CD contains valuable
free software products and Internet service provider offers
included on the CD. To install the Cable Connections CD,
follow the instructions inside the CD's jacket or on the CD
itself.

26 CHAPTER 2: HARDWARE AND SOFTWARE INSTALLATION

Connection Illustration

Use this illustration when connecting your cable modem.

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CABLE MODEM OPERATION

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Cable Modem Operation Overv iew

When your cable modem is properly installed and the
power supply is connected to AC power, it automatically
scans for the active cable modem channel from your cable
company's server. When the front panel LEDs indicate the
cable modem is connected to the server, simply lau nch your
Internet or e-mail software and you're ready to work
online.

Interpr eting the LEDs on the Front of Your Cable Modem

Here is an ov erview of the LED lights on the front panel of
your cable modem and what they can tell you about the
performance of your cable modem and the condition of
your connection.

OfficeConnect Cable Modem

1 Cable Modem Power — Indicates power is ap plied t o the

cable modem. This LED is solid green when the cable
modem is on.

2 Cable Modem Status — The color of this LED indicates

the cable modem's operatio ns stat us as:

28 CHAPTER 3: CABLE MODEM OPERATION

:

Table 1

LED STATE DESCRIPTION

BLINKING RED Cable Modem is searching for a

SOLID RED Downstream chan ne l is l oc ked
SOLID GREEN Registration is complete and

3 Cable Activity — This LED flashes red when data is

transmitted to or from your cable company via the RF
(cable) port. Flashing red indicates traffic.

4 PC Link Ethernet — This LED indicates that data is

transmitted to or from your PC via the Ethernet port. The
LED is solid green when there is connection between the
cable modem and an Ethernet port. If the LED is flashing
green, there is traffic over the Ethernet port. If this LED is
not lighted, then there is no connection between the cable
modem and an Eth ernet port.

5 PC Link USB — Indicates that data is being transmitted to

or from your PC over the USB port. This LED is solid green
when there is a con nectio n between the cab le modem an d
a USB port. If the LED is flashing green, there is traffic over
the USB port. If this LED is not lighted, then there is no
connection between the cable modem and a USB port.

downstream channel

cable modem is opera tional

Connectors and Switches on the Back of Y our Cable Modem 29

Connectors and Switches on the Bac k of Your Cable Modem

Here is an overview of the connectors and switches on the
back of your cable modem.

+

-

12VDC

RESET

1.0A MAX

10BT

USB

CATV

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cable RF connector

Cable RF Connector — This is where you connect the
coaxial cable that leads to your splitter or your cable wall
jack.

USB Port — This is where you plug the included USB cable
when performing a USB installation. The other end
connects to an active USB port on your computer

RJ-45 Ethernet Port — This is where you plug the
included RJ-45 Ethernet cable when performing an
Ethernet installation. The other end connects to the RJ-45
jack on your network interface card (NIC) or active Ethernet
port.

Power Jack — This is where you plug in the power
adapter that came with your cable modem. Remember to
use only the power supply that came with your cable
modem.

Reset Button — Use this button when you are having
trouble connecting to your broadband service provider
(BSP). This initiates a full reset of the cable modem and
re-initiates the channel scan that occurs every time your
cable modem is powered on. Click the button by inserting
a ballpoint pen into the hole and pressing until you feel the
button click.

reset button

power jack

RJ-45 Ethernet port

USB port

30 CHAPTER 3: CABLE MODEM OPERATION

TROUBLESHOOTING AND

4

S

UPPORT RESOURCES

Troubleshooting

I cannot access my e-mail or Internet service.

If you are unable to access your e-mail or use your Internet
service try these solutions and then try accessing your
e-mail:

■ Check all connections.

■ Make sure the cable li ne is secur ely connected to the

cable jack on the back of the cable modem.

■ Verify that the RJ-45 cable is securely plugged into

both the cable modem and your network interface
card, or, if you installed your cable modem via an
active USB port, that the USB cable is securely
fastened to the USB port on your computer and on
the cable modem.

■ Make sure your power supply is properly plugged

into both the cable modem and an elec trical outlet
or surge protector.

■ If your cable modem is properly connected, the

Cable Modem Power, Cable Modem Status, and PC
Link Status Ethernet/USB (dependi ng again on your
type of installation) LEDs on the front of the cable
modem should all be a solid color.

■ Press the reset button on the back of your cable

modem. You will need to use a fine-tipped instrument
(such as the tip of a ball-point pen) to press the button.
Press the button until you feel it click.

■ Call your broadband service provider (BSP) to verify that

their service is two-way. This cable modem is designed
for use only with two-way cable service.

■ If you installed th e cable mode m via a network i nterface

card (NIC), try to dete rmine whether it is
malfunctioning. Refer to the NIC’s documentation for

32 CHAPTER 4: TROUBLESHOOTING AND SUPPORT RESOURCES

troubleshooting information. If you installed the cable
modem via an active USB port, refer to your computer’s
documentation to verify that you have USB enabled on
your computer.

■ Make sure that TCP/IP is the default protocol in use by

your system. See the section titled “Configuring the
TCP/IP Protocol” on page 5 for more information.

■ If you are using a cable line splitter so that you can

connect the cable modem and a television at th e same
time, try removing the splitter and reconnecting your
cables so that your cable modem is connected directly
to your cable wall jack.

■ If you installed via a network interface card (NIC)

■ Right-click the My Computer icon on your desktop.

Click Properties.

■ Click the Device Manager tab and look for a yellow

exclamation point or red X over your NIC in the
Network adapters field. If either are there, you have
an IRQ conflict.

■ Click on your NIC's description to highlight it and

then click Remove.

■ Double-click Computer. A list of used IRQs appears.

If all of the IRQs between 0 and 15 are in use, you
must remove a device to free an IRQ for your NIC
before you can reinstall it (by restarting your
computer).

The Cable Status LE D ne ve r sto ps blinking.

The signal from your cable company's equipment may be
too weak or the cable line may not be properly attached to
the cable modem. If the cable line is properly connected to
the cable modem, call your cable company to verify
whether or not a weak signal may be the problem.

All of the LEDs on the front of my cable modem look right, but I still cannot access the Internet.

If the cable modem’s LEDs look right, but you cannot
access the Internet, try these s olutions:

■ If the Cable Modem Power, Cable Modem Status, and

PC Link Status LEDs are on but not blinking, your cable

Support Resources 33

modem is operating properly. Close any open
applications, power off your computer, and then power
it back on. This will cause your computer to re-establish
communications with your cable company's computer.

■ Press the reset button on the back of your cable

modem. Use a fine-tipped instrument (such as the tip of
a ball-point pen) to press the reset button. Press the
button until you feel it click.

■ Y ou m ay not have instal led TCP/IP pr operly or the TCP/IP

parameters provided by your broadband service
provider (BSP) may not be correct for your computer.

■ If you are using a cable line splitter so that you can

connect the cable modem and a television at th e same
time, try removing the splitter and reconnecting your
cables so that your cable modem is connected directly
to your cable wall jack.

The power on my cable modem goes on and off sporadically.
The Cable Modem Status light never stops blinking.

You might be using the wrong power supply. Verify that
the power supply you are using is the one that came with
your cable modem.

Support Resources

3Com provides these support resources if you need help
with your cable modem.

World Wide Web

To visit our online support home page, log on to:

http://support.3com.com

You can send a message to technical support by clicking
Contact Us in the “Site Tools” section of this Web site.

90-Day Free Installation Support

3Com offers free installation support for this product for 90
days after purchase. Please call the following toll-free
number:

888-877-5040

34 CHAPTER 4: TROUBLESHOOTING AND SUPPORT RESOURCES

After the 90-day limit, refer to our regular technical
support hotline number, below.

Technical Su pp ort Hotli ne

Technical questions about 3Com cable modems can be
answered by technical support representatives. Regular
telephone charges apply. The hours service is available are
7:00 AM - 11:00 PM CST Monday through Sunday.

847-262-2550

If You Are Still Havin g Prob lems

■ Review this manual.

■ Call or visit your cable modem dealer. They may be able

to assist you.

■ If your dealer can't help you, contact 3Com Technical

Support. When you call, specify your cable modem's
serial number and the software being used.

If You Need to Return the Cable Modem to 3Com

Follow these instructions to return your cable modem to
3Com:

1 Contact 3Com Technical Support. If the support

representative determines that you need to return the cable
modem, you will receive a USO (User Service Order)
number. You must have a USO number before returning
the cable modem to us.

2 Ship the unit, postage paid, in a strong box made of

corrugated cardboard with plenty of packing material. DO
NOT send the cable modem back in the original box. Send
ONLY the cable modem (NOT manuals, diskettes, CDs,
etc.). Include your USO number, name, and address on the
shipping label as well as inside the package. If possible,
send the package via a courier capable of tracking the
progress of the shipment. Ship to the following address:

3Com

USO #________

Dock 15

Support Resources 35

1800 W. Central Ave.

Mount Prospect, IL 60056

36 CHAPTER 4: TROUBLESHOOTING AND SUPPORT RESOURCES

REGULATORY INFORMATION

5

AND LIMITED WARRANTY

Manufacturer's Declaration of C onformity

3Com
3800 Golf Road
Rolling Meadows, IL 60008
U.S.A.

declares that the product 3Com OfficeConnect Cable
Modem External conforms to the FCC's specifications:

Part 15

Operation is subject to the following two conditions:
(1) this device may not cause harmful electromagnetic

interference, and
(2) this device must accept any interference received

including interference that may cause undesired
operations.

FCC Class B Statement

This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:

1 this device may not cause harmful electromagnetic

interference, and

2 this device must accept any interference received including

interference that may cause undesired operations.

FCC Notice: Radio and Television Interference

This equipment has been tested and found to comply with
the limits for a Class B digital device, pursuant to Part 15 of
the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and
can radiate radio frequency energy and, if not installed and

38 CHAPTER 5: REGULATORY INFORMATION AND LIMITED WARRANT Y

used in accordance with the instructions, may cause
harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be
determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or
more of the follow in g me a sures:

■ Reorient or relocate the receiving antenna.

■ Increase the separation between the equipment and

receiver.

■ Connect the equipment into an outlet on a circuit

different from that to which the receiver is connected.

■ Consult the dealer or an experienced radio/TV

technician for help.

The user may find the following information prepared by
the Federal Communications Commission helpful: The CIB
Interference Handbook and The CIB Telephone Interference
Bulletin.

These documents are available on the Internet through the
FCC Compliance and Interference Bureau Home Page at
http://www.fcc.gov/cib (listed under documents). Select CIB
Interference Handbook or CIB Telephone Interference
Bulletin.

Caution to the User

THE USER IS CAUTIONED THAT ANY CHANGES OR
MODIFICATIONS NOT EXPRESSLY APPROVED BY THE
PARTY RESPONSIBLE FOR COMPLIANCE COULD VOID THE
USER'S AUTHORITY TO OPERATE THE EQUIPMENT.

Performance Specifications

This equipment has a bit-error rate (BER) less than 10-8
when the signal-to-noise ratio (SNR) is 23.5 dB or greater
when operating in 64 QAM mode, and when the SNR is

30.0 dB or greater when operating in 256 QAM mode.

Export Notices

■ Unlawful to export from the US or Canada without an

approved US Department of Commerce export license.

■ The hardware contained in this product contains

encryption software which may not be exported or
transferred from the US or Canada without an
approved US Department of Commerce export license.

License Agreem ent

You agree that you will not export or re-export the
Software or accompanying documentation (or any copies
thereof) or any products utilizing the Software or such
documentation in violation of any applicable laws or
regulations of the United States or the country in which
you obtained them.

The software covered by this agreement may contain
strong data encryption code that cannot be exported
outside of the U.S. or Canada. You agree that you will not
export/re-export, either physically or electronically, the
encryption software or accompanying documentation (or
copies thereof) or any products utilizing the encryption
software or such documentation without obtaining written
authorization from the U.S. Department of Commerce.

Manufacturer's Dec la ra tion of Conformity 39

Industry Canada (IC)

This digital appara tus does not exceed the Cla ss B li mits fo r
radio noise emissions from digital apparatus set out in the
interference-causing equipment standard entitled Digital
Apparatus, ICES-003 of Industry Canada.

Cet appareil num
radio

électriques applicab les aux ap parei ls num ériques de

Classe B pr
Appareils Num
Canada.

UL Listing/CUL Listing

This Information Technology Equipment (ITE) is
UL-Listed and CUL-Listed for use with UL-Listed
Personal Computers.

érique respecte les limites de bruits

éscrites dans la norme sur le matèriel brouilleur:

ériques, NMB-003 édictée par l'Industrie

40 CHAPTER 5: REGULATORY INFORMATION AND LIMITED WARRANT Y

Radio and Television Interference

This equipment generates and uses radio frequency energy
and if not installed and used properly, in strict accordance
with the manufacturer's instructions, may cause
interference to radio and television reception. This device
has been tested and found to comply with the limits for a
Class B computing device in accordance with the
specifications in Part 15 of FCC rules, which are designed
to provide reasonable protection against such interference
in a residential installation.

However, there is no guarantee th at interference will not
occur in a particular installation. If this device does cause
interference to radio or television reception, which you can
determine by monitoring reception when the cable modem
is installed and when it is removed from the computer, try
to correct the problem with one or more of the following
measures:

■ Reorient the receiving antenna (for televisions with

antenna reception only) or cable input device.

■ Relocate the computer with respect to the receiver.

■ Relocate the computer and/or the receiver so that they

are on separate branch circuits.

If necessary, consult your dealer or an experienced
radio/television technician for additional suggestions. You
may find the following booklet, prepared by the Federal
Communications Com mi ssi on , help ful:

How to Identify and Resolve Radio-TV Interference
Problems

Stock No. 004-000-0345-4
U.S. Government Printing Office
Washington, DC 20402

In accordance wi th Part 15 of the FCC rules, the user is
cautioned that any changes or modifications to the
equipment described in this manual that are not expressly
approved by 3Com could void the user's authority to
operate the equipment.

3Com Corporation Limited Warranty 41

VCCI Statement

3Com Corporatio n L i m ite d Warranty

Hardware

3Com warrants to the end user (“Customer”) that this
hardware product will be free from defects in workmanship
and materials, under normal use and service, for the
following length of time from the date of purchase from
3Com or its authorized reseller:

5 Years

3Com’s sole obligation under this express warranty shall be,
at 3Com’s option and expense, to repair the defective
product or part, deliver to Customer an equivalent product
or part to replace the defective item, or if neither of the
two foregoing options is reasonably available, 3Com may,
in its sole discr etion, refu nd to Customer the pur chase price
paid for the defective product. All products that are
replaced will become the property of 3Com. Replacement
products may be new or reconditioned. 3Com warrants
any replaced or repaired product or part for ninety (90)
days from shipment, or the remainder of the initial
warranty period, whichever is longe r.

Software

3Com warrants to Customer that each software program
licensed from it will perform in substantial conformance to
its program specifications, for a period of ninety (90) days
from the date of purchase from 3Com or its authorized
reseller. 3Com warrants the media containing software
against failure during the warranty period. No updates are
provided. 3Com's sole obligation under this express
warranty shall be, at 3Com's option and expense, to refund
the purchase price paid by Customer for any defective
software product, or to replace any defective media with

42 CHAPTER 5: REGULATORY INFORMATION AND LIMITED WARRANT Y

software which substantially conforms to applicable 3Com
published specifications. Customer assumes responsibility
for the selection of the appropriate applications program
and associated reference materials. 3Com makes no
warranty or representation that its software products will
meet Customer’s requirements or work in combination
with any hardware or applications software products
provided by third parties, that the operation of the
software products will be uninterrupted or error free, or
that all defects in the software products will be corrected.
For any third party products listed in the 3Com software
product documentation or specifications as being
compatible, 3Com will make reasonable efforts to provide
compatibility, except where the non-compatibility is caused
by a “bug” or defect in the third party's product or from
use of the software product not in accordance with 3Com’s
published specifi cat io ns or user manu al .

THIS 3COM PRODUCT MAY INCLUDE OR BE BUNDLED
WITH THIRD PARTY SOFTWARE, THE USE OF WHICH IS
GOVERNED BY A SEPARATE END USER LICENSE
AGREEMENT. THIS 3COM WARRANTY DOES NOT APPLY
TO SUCH THIRD PARTY SOFTWARE. FOR THE APPLICABLE
WARRANTY, PLEASE REFER TO THE EN D USER LICENSE
AGREEMENT GOVERNING THE USE OF SUCH SOFTWARE.

Year 20 0 0 Warran t y

In addition to the Hardware Warranty stated above, 3Com
warrants that each product sold or licensed to Customer on
and after January 1, 1998 that is date sensitive will
continue performing properly with regard to such date
data on and after January 1, 2000, provided that all other
products used by Customer in connection or combination
with the 3Com product, including hardware, software, and
firmware, accurately exchange date data with the 3Com
product, with the exception of those products identified at
3Com's Web site,

http://www.3com.com/products/yr2000.html

as not meeting this standard. If it appears that any product
that is stated to meet this standard does not perform
properly with r egard to such date data on and after January

1, 2000, and Customer notifies 3Com before the later of
April 1, 2000, or ninety (90) days after purchase of the
product from 3Com or its authorized reseller, 3Com shall,
at its option and expense, provide a software update which
would effect the proper performance of such product,
repair such product, deliver to Customer an equivalent
product to replace such product, or if none of the
foregoing is feasible, refund to Customer the purchase
price paid for such product.

Any software update or replaced or repaired product will
carry a Y ear 2000 Warranty for ninety (90) days after
purchase or until April 1, 2000, whichever is later.

Obtaining Warranty Service

Customer must contact a 3Com Corporate Service Center
or an Authorized 3Com Service Center within the
applicable warranty period to obtain warranty service
authorization. Dated proof of purchase from 3Com or its
authorized reseller may be required. Products returned to
3Com's Corporate Service Center must be pre-au thorized
by 3Com with a User Service Order (USO) number marked
on the outside of the package, and sent prepaid and
packaged appropriately for safe shipment, and it is
recommended that they be insured or sent by a method
that provides for tracking of the package. The repaired or
replaced item will be shipped to Customer, at 3Com's
expense, no t lat er th an th irt y (3 0) day s af ter 3Com receives
the defective product.

3Com Corporation Limited Warranty 43

WARRANTIES EXCLUSIVE

IF A 3COM PRODUCT DOES NOT OPERATE AS
WARRANTED ABOVE, CUSTOMER'S SOLE REMEDY FOR
BREACH OF THAT WARRANTY SHALL BE REPAIR,
REPLACEMENT, OR REFUND OF THE PURCHASE PRICE
P AID, A T 3 COM'S OPTION. TO THE FULL EXT ENT ALLOWED
BY LAW, THE FOREGOING WARRANTIES AND REMEDIES
ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER
WARRANTIES, TERMS, OR CONDITIONS, EXPRESS OR
IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW,
STATUTORY OR OTHERWISE, INCLUDING WARRANTIES,
TERMS, OR CONDITIONS OF MERCHANTABILITY, FITNESS

44 CHAPTER 5: REGULATORY INFORMATION AND LIMITED WARRANT Y

FOR A PARTICULAR PURPOSE, SATISFACTORY QUALITY,
CORRESPONDEN CE WITH DESCRIPTION, AND
NON-INFRINGEMENT, ALL OF WHICH ARE EXPRESSLY
DISCLAIMED. 3COM NEITHER ASSUMES NOR AUTHORIZES
ANY OTHER PERSON TO ASSUME FOR IT ANY OTHER
LIABILITY IN CO NNECTION W ITH THE S ALE, INS TALLATION,
MAINTENANCE OR USE OF ITS PRODUCTS.

3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF
ITS TESTING AND EXAMINATION DISCLOSE THAT THE
ALLEGED DEFECT OR MALFUNCTION IN THE PRODUCT
DOES NOT EXIST OR WAS CAUSED BY CUSTOMER'S OR
ANY THIRD PERSON'S MISUSE, NEGLECT, IMPROPER
INSTALLATION OR TESTING, UNAUTHORIZED ATTEMPTS
TO OPEN, REPAIR OR MODIFY THE PRODUCT, OR ANY
OTHER CAUSE BEYOND THE RANGE OF THE INTENDED
USE, OR BY ACCIDENT, FIRE, LIGHTNING, OTHER
HAZARDS, OR ACTS OF GOD.

LIMIT ATION OF LIABILITY

TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO
EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY LIABILITY,
WHETHER BASED IN CONTRACT OR TORT (INCLUDING
NEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL,
INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF AN Y KIND,
OR FOR LOSS OF REVENUE OR PROFITS, LOSS OF
BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER
FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION
WITH THE SALE, INSTALLA TION, MAINTENANCE, USE,
PERFORMANCE, FAILURE, OR INTERRUPTION OF ITS
PRODUCTS, EVEN IF 3COM OR ITS AUTHOR IZED RESELLER
HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES, AND LIMITS ITS LIABILITY TO REPAIR,
REPLACEMENT, OR REFUND OF THE PURCHASE PRICE
PAID, AT 3COM'S OPTION. THIS DISCLAIMER OF LIABILITY
FOR DAMAGES WILL NOT BE AFFECTED IF ANY REMEDY
PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE.

Disclaimer

Some countries, states, or provinces do not allow the
exclusion or limitation of implied w arranties or the
limitation of incidental or consequential damages for

certain products supplied to consumers, or the limitation of
liability for personal injury, so the above limitations and
exclusions may be limited in their application to you. When
the implied warranties are not allowed to be excluded in
their entirety, they will be limited to the duration of the
applicable written warranty. This warranty gives you
specific legal rights which may vary depending on local law.

Governing Law

This Limited Warranty shall be governed by the laws of the
State of California, U.S.A. excluding its conflicts of laws
principles and excluding the United Nations Convention on
Contracts for the International Sale of Goods.

3Com Corporation Limited Warranty 45

46 CHAPTER 5: REGULATORY INFORMATION AND LIMITED WARRANT Y

3Com OfficeConnect Cable Modem External Wall-mounting Template

6

For complete instructions, see the

Getting Started Guide

.

MOUNTING TEMPLATE

48 CHAPTER 6: MOUNTING TEMPLATE