Linksys BEFCMU10 - Cable Modem With USB User manual

A Division of Cisco Systems, Inc.
®
Model No.
WIRED
with USB and
Cable Modem
BEFCMU10
User Guide
Ethernet Connections

Cable Modem with USB and Ethernet Connections
Copyright and Trademarks
Specifications are subject to change without notice. Linksys is a registered trademark or trademark of Cisco
Systems, Inc. and/or its affiliates in the U.S. and certain other countries. Copyright © 2003 Cisco Systems, Inc. All
rights reserved. Other brands and product names are trademarks or registered trademarks of their respective
holders.
How to Use this Guide
Your guide to the Cable Modem has been designed to make understanding networking with the Cable Modem
easier than ever. Look for the following items when reading this guide:
In addition to these symbols, there are definitions for technical terms that are presented like this:
Also, each figure (diagram, screenshot, or other image) is provided with a figure number and description, like
this:
Figure numbers and descriptions can also be found in the “List of Figures” section in the “Table of Contents”.
This exclamation point means there is a Caution or
warning and is something that could damage your
property or the Cable Modem.
word: definition.
This checkmark means there is a Note of interest and
is something you should pay special attention to while
using the Cable Modem.
This question mark provides you with a reminder about something
you might need to do while using the Cable Modem.
Figure 0-1: Sample Figure Description
BEFCMU10_V4-UG-41118NC BW
WARNING: This product contains chemicals, including lead, known
to the State of California to cause cancer, and birth defects or other
reproductive harm. Wash hands after handling.

Cable Modem with USB and Ethernet Connections
Table of Contents
Chapter 1: Introduction 1
Welcome 1
What’s in this Guide? 1
Chapter 2: Getting to Know the Cable Modem 3
Back Panel Ports 3
Front Panel LEDs 4
Chapter 3: Connecting the Cable Modem 5
Overview 5
Connection Using the Ethernet Port 5
Connection Using the USB Port 6
Chapter 4: Installing the USB Driver for Windows XP 7
Overview 7
Instructions for Installing the Driver 7
Chapter 5: Installing the USB Driver for Windows 2000 8
Overview 8
Instructions for Installing the Driver 8
Chapter 6: Installing the USB Driver for Windows Millennium 10
Overview 10
Instructions for Installing the Driver 10
Chapter 7: Installing the Driver for Windows 98 11
Overview 11
Instructions for Installing the Driver 11
Appendix A: Troubleshooting 13
Common Problems and Solutions 13
Appendix B: Windows Help 15
Appendix C: Glossary 16
Appendix D: Specifications 23
Appendix E: Warranty Information 24
Appendix F: Regulatory Information 25
Appendix G: Contact Information 26

Cable Modem with USB and Ethernet Connections
List of Figures
Figure 2-1: Back Panel 3
Figure 2-2: Front Panel 4
Figure 3-1: Connect the Coaxial Cable 5
Figure 3-2: Connect the Ethernet Network Cable 5
Figure 3-3: Connect the Power Cable 5
Figure 3-4: Connect the Coaxial Cable 6
Figure 3-5: Connect the USB Cable 6
Figure 3-6: Connect the Power Cable 6
Figure 4-1: Welcome 7
Figure 4-2: Please wait... 7
Figure 5-1: Welcome 8
Figure 5-2: Install Hardware Device Drivers 8
Figure 5-3: Locate Driver Files 8
Figure 5-4: Driver Files Search Results 9
Figure 5-5: Driver Installation Complete 9
Figure 6-1: Add New Hardware Wizard 10
Figure 6-2: Driver Installation Complete 10
Figure 7-1: Add New Hardware Wizard 11
Figure 7-2: Search for Driver 11
Figure 7-3: Select CD-ROM Drive 11
Figure 7-4: Select Updated Driver 12
Figure 7-5: Location of Driver 12
Figure 7-6: Driver Installation Complete 12

1
Chapter 1: Introduction
Welcome
Cable Modem with USB and Ethernet Connections
Chapter 1: Introduction
Welcome
Thank you for choosing the Linksys Cable Modem. Experience the savings of owning your own cable modem!
The Linksys Cable Modem is the easiest and most affordable way to get a blazing fast connection to the Internet
-- far faster than a dial-up, and without tying up your phone line. The "always on" connection eliminates dial-up
wait time and busy signals. Web surfing and your e-mail are instantly available, anytime. And with the extra
speed, online gaming is a whole new experience, and download time on big music, video, and other files goes
from hours to minutes.
Installation is quick and simple. Connect it directly to any PC with an available USB or Ethernet port, and you’re
ready to surf the Internet. Or connect it to a Linksys router and share that high-speed Internet access with
everyone on your home network.
The Linksys Cable Modem is fully compliant with all industry standards—DOCSIS 1.0, 1.1, and 2.0—so you know
it’ll work with any cable Internet service provider.
With the Linksys Cable Modem, you'll avoid monthly rent charges, and make the most of your high-speed cable
Internet connection.
What’s in this Guide?
This user guide covers the steps for installing the Cable Modem and installing its USB driver if you are using its
USB connection.
• Chapter 1: Introduction
This chapter describes the Cable Modem’s applications and this User Guide.
• Chapter 2: Getting to Know the Cable Modem
This chapter describes the physical features of the Cable Modem.
• Chapter 3: Connecting the Cable Modem
This chapter instructs you on how to connect the Cable Modem using its Ethernet or USB port.
• Chapter 4: Installing the USB Driver for Windows XP
This chapter explains how to install the Windows XP driver required for a USB connection to the Cable
Modem.

2
Chapter 1: Introduction
What’s in this Guide?
Cable Modem with USB and Ethernet Connections
• Chapter 5: Installing the USB Driver for Windows 2000
This chapter explains how to install the Windows 2000 driver required for a USB connection to the Cable
Modem.
• Chapter 6: Installing the USB Driver for Windows Millennium
This chapter explains how to install the Windows Millennium driver required for a USB connection to the
Cable Modem.
• Chapter 7: Installing the USB Driver for Windows 98
This chapter explains how to install the Windows 98 driver required for a USB connection to the Cable
Modem.
• Appendix A: Troubleshooting
This appendix describes some potential problems and solutions regarding use of the Cable Modem.
• Appendix B: Windows Help
This appendix describes how you can use Windows Help for instructions about networking, such as installing
the TCP/IP protocol.
• Appendix C: Glossary
This appendix gives a brief glossary of terms frequently used in networking.
• Appendix D: Specifications
This appendix provides the technical specifications for the Cable Modem.
• Appendix E: Warranty Information
This appendix supplies the warranty information for the Cable Modem.
• Appendix F: Regulatory Information
This appendix supplies the regulatory information regarding the Cable Modem.
• Appendix G: Contact Information
This appendix provides contact information for a variety of Linksys resources, including Technical Support.

3
Chapter 2: Getting to Know the Cable Modem
Back Panel Ports
Cable Modem with USB and Ethernet Connections
Chapter 2: Getting to Know the Cable Modem
Back Panel Ports
The Cable Modem’s ports are located on the back panel.
Power Port The Power port is where you will connect the included power adapter.
Reset Button The Reset button allows you to clear the Cable Modem’s connections and set the Cable
Modem to the factory defaults.
Ethernet Port The Ethernet port allows you to connect the Cable Modem to your PC or other Ethernet
network device using a Category 5 (or better) Ethernet network cable.
USB Port The USB port allows you to connect the Cable Modem to your PC using the included USB cable.
Cable Port The Cable port is where you will connect the cable from your Internet Service Provider (ISP).
This is a round coaxial cable, like the one that connects to the back of your cable box or
television.
Figure 2-1: Back Panel

4
Chapter 2: Getting to Know the Cable Modem
Front Panel LEDs
Cable Modem with USB and Ethernet Connections
Front Panel LEDs
The Cable Modem’s LEDs are located on the front panel.
Power Green. The Power LED lights up when the Cable Modem is powered on. It stays solid after the
self-test. If the LED lights up red, the self-test has failed.
Internet, Online Green. The Online LED flashes when the Cable Modem is establishing a connection to your
cable ISP. It is solidly lit when the Cable Modem is synchronized with your cable ISP.
Internet, DS Green. The DS (Downstream) LED lights up and flashes when the Cable Modem is trying to
lock on a downstream signal. The LED stays solid when it has locked on the signal.
Internet, US Green. The US (Upstream) LED lights up and flashes when the Cable Modem is trying to lock
on an upstream signal. The LED stays solid when it has locked on the signal.
Ethernet Green. The Ethernet LED lights up when the Cable Modem is connected to your computer or
network through the Ethernet port. It flashes when there is activity on the Ethernet port. The
LED will light up orange when there is a data collision.
USB Green. The USB LED lights up when the Cable Modem is connected to your computer or
network through the USB port. It flashes when there is activity on the USB port. The LED will
light up orange when the USB is connected and before the driver is installed.
Figure 2-2: Front Panel
NOTE: If the US and DS LEDs are flashing, the
modem is still operating, but your Internet service
has been disabled by your Internet Service
Provider.
NOTE: If the US, DS, and Online LEDs are flashing,
the modem is performing a self-test.

5
Chapter 3: Connecting the Cable Modem
Overview
Cable Modem with USB and Ethernet Connections
Chapter 3: Connecting the Cable Modem
Overview
You can connect the Cable Modem to your PC using either the Ethernet port or the USB port. If you use the USB
port, you will also have to install a USB driver on your PC. If you are using the Cable Modem’s Ethernet port,
proceed to the “Connection Using the Ethernet Port” section. If you are using the Cable Modem’s USB port,
proceed to the “Connection Using the USB Port” section.
Connection Using the Ethernet Port
1. Power off your PC. If you have an existing cable modem that you are replacing, disconnect it at this time.
2. Connect the coaxial cable from your Internet Service Provider (ISP) or cable company to the Cable port on
the back panel of the Cable Modem. (The other end of the coaxial cable should be connected according to
the ISP or cable company’s instructions.)
3. Connect the included Ethernet network cable to the Ethernet port on the back panel of the Cable Modem.
4. Connect the other end of the Ethernet network cable to the RJ-45 port of your PC’s Ethernet network adapter
or a network device, such as a router, switch, or hub.
5. Connect the included power adapter to the Power port on the back panel of the Cable Modem. Connect the
other end to a standard electrical outlet.
6. The Power LED on the front panel of the Cable Modem should light up and remain lit.
7. Power on your PC.
8. Contact your cable ISP to activate your account. Your cable ISP will need the MAC address for the Cable
Modem in order to set up your account. The 12-digit MAC address is printed on a bar code label on the bottom
of the Cable Modem. Once you have given them this number, your cable ISP should be able to activate your
account.
Congratulations! The installation of the Cable Modem is complete.
NOTE: To activate your high-speed Internet account,
you must contact your cable ISP after you have
connected the Cable Modem.
NOTE: Make sure that you have TCP/IP installed on
your computer. For more information, refer to
“Appendix B: Windows Help.”
Figure 3-1: Connect the Coaxial Cable
Figure 3-2: Connect the Ethernet Network Cable
Figure 3-3: Connect the Power Cable

6
Chapter 3: Connecting the Cable Modem
Connection Using the USB Port
Cable Modem with USB and Ethernet Connections
Connection Using the USB Port
1. Power off your PC. If you have an existing cable modem that you are replacing, disconnect it at this time.
2. Connect the coaxial cable from your Internet Service Provider (ISP) or cable company to the Cable port on the
back panel of the Cable Modem. (The other end of the coaxial cable should be connected according to the ISP
or cable company’s instructions.)
3. Connect the included power adapter to the Power port on the back panel of the Cable Modem. Connect the
other end to a standard electrical outlet.
4. The Power LED on the front panel of the Cable Modem should light up and remain lit.
5. Connect the square end of the included USB cable to the USB port on the back panel of the Cable Modem.
6. Connect the rectangular end of the USB cable to your PC’s USB port.
7. Power on your PC. During the boot-up process, your computer should recognize the Cable Modem and
request to install the Cable Modem’s driver. Proceed to the appropriate chapter for instructions on how to
install the USB driver.
• If your PC runs Windows XP, proceed to “Chapter 4: Installing the USB Driver for Windows XP.”
• If your PC runs Windows 2000, proceed to “Chapter 5: Installing the USB Driver for Windows 2000.”
• If your PC runs Windows Millennium, proceed to “Chapter 6: Installing the USB Driver for Windows
Millennium.”
• If your PC runs Windows 98, proceed to “Chapter 7: Installing the USB Driver for Windows 98.”
Figure 3-5: Connect the USB Cable
Figure 3-4: Connect the Coaxial Cable
Figure 3-6: Connect the Power Cable

7
Chapter 4: Installing the USB Driver for Windows XP
Overview
Cable Modem with USB and Ethernet Connections
Chapter 4: Installing the USB Driver for Windows XP
Overview
If you are connecting the Cable Modem to your computer using the USB port, follow these instructions to install
the USB driver required for Windows XP.
Instructions for Installing the Driver
1. Power on your computer. Make sure you have administrative rights on your computer; otherwise you cannot
install the driver.
2. Windows XP will automatically detect the Cable Modem. Insert the User Guide and USB Drivers CD-ROM into
your computer’s CD-ROM drive.
3. On the Welcome screen of the Found New Hardware Wizard, select Install the software automatically
(Recommended), and click the Next button.
4. Please wait while Windows XP finds and automatically installs the driver. When Windows XP has finished
installing the driver, the screen shown in Figure 4-2 will disappear.
5. The Windows XP driver installation is complete. Contact your cable ISP to activate your account. Your cable
ISP will need the MAC address for the Cable Modem in order to set up your account. The 12-digit MAC
address is printed on a bar code label on the bottom of the Cable Modem. Once you have given them this
number, your cable ISP should be able to activate your account.
Congratulations! The installation of the Cable Modem is complete.
Figure 4-2: Please wait...
Figure 4-1: Welcome
NOTE: To activate your high-speed Internet account,
you must contact your cable ISP after you have
connected the Cable Modem.

8
Chapter 5: Installing the USB Driver for Windows 2000
Overview
Cable Modem with USB and Ethernet Connections
Chapter 5: Installing the USB Driver for Windows 2000
Overview
If you are connecting the Cable Modem to your computer using the USB port, follow these instructions to install
the USB driver required for Windows 2000.
Instructions for Installing the Driver
1. Power on your computer. Make sure you have administrative rights on your computer; otherwise you cannot
install the driver.
2. Windows 2000 will automatically detect the Cable Modem. Insert the User Guide and USB Drivers CD-ROM
into your computer’s CD-ROM drive.
3. On the Welcome screen of the Found New Hardware Wizard, click the Next button.
4. On the Install Hardware Device Drivers screen, select Search for a suitable driver for my device
(recommended). Then click the Next button.
5. On the Locate Driver Files screen, select CD-ROM drives, and click the Next button.
Figure 5-2: Install Hardware Device Drivers
Figure 5-1: Welcome
Figure 5-3: Locate Driver Files

9
Chapter 5: Installing the USB Driver for Windows 2000
Instructions for Installing the Driver
Cable Modem with USB and Ethernet Connections
6. On the Driver Files Search Results screen, click the Next button.
7. When Windows 2000 has finished installing the driver, the Completing the Found New Hardware Wizard
screen will appear. Click the Finish button.
8. The Windows 2000 driver installation is complete. Contact your cable ISP to activate your account. Your cable
ISP will need the MAC address for the Cable Modem in order to set up your account. The 12-digit MAC
address is printed on a bar code label on the bottom of the Cable Modem. Once you have given them this
number, your cable ISP should be able to activate your account.
Congratulations! The installation of the Cable Modem is complete.
Figure 5-4: Driver Files Search Results
Figure 5-5: Driver Installation Complete
NOTE: To activate your high-speed Internet account,
you must contact your cable ISP after you have
connected the Cable Modem.

10
Chapter 6: Installing the USB Driver for Windows Millennium
Overview
Cable Modem with USB and Ethernet Connections
Chapter 6: Installing the USB Driver for Windows
Millennium
Overview
If you are connecting the Cable Modem to your computer using the USB port, follow these instructions to install
the USB driver required for Windows Millennium.
Instructions for Installing the Driver
1. Power on your computer. Make sure you have administrative rights on your computer; otherwise you cannot
install the driver.
2. Windows Millennium will automatically detect the Cable Modem. Insert the User Guide and USB Drivers CD-
ROM into your computer’s CD-ROM drive.
3. On the first screen of the Add New Hardware Wizard, select Automatic search for a better driver
(Recommended). Then click the Next button.
4. Please wait while Windows Millennium finds and automatically installs the driver. When Windows Millennium
has finished installing the driver, click the Finish button.
5. The Windows Millennium driver installation is complete. Contact your cable ISP to activate your account. Your
cable ISP will need the MAC address for the Cable Modem in order to set up your account. The 12-digit MAC
address is printed on a bar code label on the bottom of the Cable Modem. Once you have given them this
number, your cable ISP should be able to activate your account.
Congratulations! The installation of the Cable Modem is complete.
Figure 6-1: Add New Hardware Wizard
Figure 6-2: Driver Installation Complete
NOTE: To activate your high-speed Internet account,
you must contact your cable ISP after you have
connected the Cable Modem.

11
Chapter 7: Installing the Driver for Windows 98
Overview
Cable Modem with USB and Ethernet Connections
Chapter 7: Installing the Driver for Windows 98
Overview
If you are connecting the Cable Modem to your computer using the USB port, follow these instructions to install
the USB driver required for Windows 98.
Instructions for Installing the Driver
1. Power on your computer. Make sure you have administrative rights on your computer; otherwise you cannot
install the driver.
2. Windows 98 will automatically detect the Cable Modem. Insert the User Guide and USB Drivers CD-ROM into
your computer’s CD-ROM drive.
3. On the first screen of the Add New Hardware Wizard, click the Next button.
4. Select Search for the best driver for your device (Recommended). Then click the Next button.
5. Select CD-ROM drive. Then click the Next button.
Figure 7-2: Search for Driver
Figure 7-1: Add New Hardware Wizard
Figure 7-3: Select CD-ROM Drive

12
Chapter 7: Installing the Driver for Windows 98
Instructions for Installing the Driver
Cable Modem with USB and Ethernet Connections
6. Select The updated driver (Recommended). Then click the Next button.
7. After Windows has found the driver, click the Next button.
8. When Windows 98 has finished installing the driver, click the Finish button.
9. The Windows 98 driver installation is complete. Contact your cable ISP to activate your account. Your cable
ISP will need the MAC address for the Cable Modem in order to set up your account. The 12-digit MAC
address is printed on a bar code label on the bottom of the Cable Modem. Once you have given them this
number, your cable ISP should be able to activate your account.
Congratulations! The installation of the Cable Modem is complete. Figure 7-4: Select Updated Driver
Figure 7-5: Location of Driver
Figure 7-6: Driver Installation Complete
NOTE: To activate your high-speed Internet account,
you must contact your cable ISP after you have
connected the Cable Modem.

13
Appendix A: Troubleshooting
Common Problems and Solutions
Cable Modem with USB and Ethernet Connections
Appendix A: Troubleshooting
This appendix provides solutions to problems that may occur during the installation and operation of the Cable
Modem. Read the description below to solve your problems. If you can't find an answer here, check the Linksys
website at www.linksys.com.
Common Problems and Solutions
1. I cannot access my e-mail or Internet service.
Go through this checklist until your problem is solved:
• Make sure all of your connections are secure.
1. The Ethernet cable should be inserted completely into both the computer’s network adapter and the
Ethernet port on the back panel of the Cable Modem.
2. If you are using the Cable Modem’s USB port, check the USB connections to the Cable Modem and
your PC.
3. Check all cables between your computer and the Cable Modem for frays, breaks, or exposed wiring.
4. Make sure your power adapter is properly plugged into both the Cable Modem and the electrical
outlet or surge protector. If the Cable Modem is properly connected, the Power and Cable LEDs on the
Cable Modem should be solidly lit. The Activity LED should be solid or flashing.
• Press the Reset button on the back panel of the Cable Modem. Using an object with a small tip, such as a
pen, push the button until you feel it click. Then try reconnecting to the Internet.
• Call your cable ISP to verify that their service is two-way. This Cable Modem is designed for use with two-
way cable networks.
• If you installed the Cable Modem using the Ethernet port, make sure the computer’s network adapter is
operating correctly. Make sure the adapter is listed in the Windows Device Manager and has no conflicts.
For more information, refer to Windows Help.
• Make sure TCP/IP is the default protocol used by your computer. For more information, refer to “Appendix
B: Windows Help.”
• If you are using a cable line splitter so you can connect the Cable Modem and a television at the same
time, remove the splitter and reconnect your cables so that the Cable Modem is connected directly to the
cable wall jack. Then try reconnecting to the Internet.
2. The Online LED never stops flashing.
Go through this checklist until your problem is solved:
• Make sure the Cable Modem’s MAC address has been registered with your cable ISP. In order for the
Cable Modem to work, you must call and have the ISP activate the Cable Modem by registering its MAC
address. You can find the MAC address on a label located on the Cable Modem’s bottom panel.
• Make sure the coaxial cable is firmly attached between the Cable Modem and the wall jack.

14
Appendix A: Troubleshooting
Common Problems and Solutions
Cable Modem with USB and Ethernet Connections
• 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, then call your
cable company to verify whether a weak signal may be the problem.
3. All of the LEDs on the Cable Modem indicate that the Cable Modem is functioning properly, but I still
can’t access the Internet.
Go through this checklist until your problem is solved:
• If the Power and Online LEDs are lit but not flashing, then the Cable Modem is operating properly. Power
your computer off and back on again. This will cause your computer to re-establish communications with
your cable ISP.
• Press the Reset button on the back panel of the Cable Modem. Using an object with a small tip, such as a
pen, push the button until you feel it click. Then try reconnecting to the Internet.
• Make sure TCP/IP is the default protocol used by your computer. For more information, refer to “Appendix
B: Windows Help.”
4. The power on the Cable Modem goes on and off sporadically.
You may be using the wrong power adapter. Make sure the power adapter you are using is the one included
with the Cable Modem.

15
Appendix B: Windows Help
Cable Modem with USB and Ethernet Connections
Appendix B: Windows Help
Most Linksys products require Microsoft Windows. Windows is the most used operating system in the world and
comes with many features that help make networking easier. These features can be accessed through Windows
Help and are described in this appendix.
TCP/IP
Before a computer can communicate with a network router, TCP/IP must be enabled. TCP/IP is a set of
instructions, or protocol, all PCs follow to communicate over a network. This is true for wireless networks as well.
Your PCs will not be able to utilize wireless networking without having TCP/IP enabled. Windows Help provides
complete instructions on enabling TCP/IP.
Shared Resources
If you wish to share printers, folder, or files over your network, Windows Help provides complete instructions on
utilizing shared resources.
Network Neighborhood/My Network Places
Other PCs on your network will appear under Network Neighborhood or My Network Places (depending upon the
version of Windows you're running). Windows Help provides complete instructions on adding PCs to your
network.

16
Appendix C: Glossary
Cable Modem with USB and Ethernet Connections
Appendix C: Glossary
802.11a - A wireless networking standard that specifies a maximum data transfer rate of 54Mbps and an
operating frequency of 5GHz.
802.11b - A wireless networking standard that specifies a maximum data transfer rate of 11Mbps and an
operating frequency of 2.4GHz.
802.11g - A wireless networking standard that specifies a maximum data transfer rate of 54Mbps, an operating
frequency of 2.4GHz, and backward compatibility with 802.11b devices.
Access Point - A device that allows wireless-equipped computers and other devices to communicate with a
wired network. Also used to expand the range of a wireless network.
Adapter - A device that adds network functionality to your PC.
Ad-hoc - A group of wireless devices communicating directly with each other (peer-to-peer) without the use of
an access point.
AES (Advanced Encryption Standard) - A security method that uses symmetric 128-bit block data encryption.
Backbone - The part of a network that connects most of the systems and networks together, and handles the
most data.
Bandwidth - The transmission capacity of a given device or network.
Beacon Interval - Data transmitted on your wireless network that keeps the network synchronized.
Bit - A binary digit.
Boot - To start a device and cause it to start executing instructions.
Bridge - A device that connects different networks.
Broadband - An always-on, fast Internet connection.
Browser - An application program that provides a way to look at and interact with all the information on the
World Wide Web.