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SB5100 Series Cable Modem User Guide
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Introduction
Before You Begin
Installation & Configuration
FAQ
Troubleshooting
Glossary
Cabling for Multiple Users
The SURFboard cable modem supports several multiple user configurations. Along with
an optional hub or router, it can serve as an Internet gateway for up to 32 computers.
Not all service providers support multiple user service. For information about multiple
user service, contact your cable service provider.
Ethernet and USB
You can connect the USB port on one computer and the Ethernet port on another
computer directly to the cable modem, as shown at top left.
Caution
You can connect a single computer to the USB port and from one to 31 remaining users
to an Ethernet hub, as shown at bottom left. You cannot connect more than
one computer to the cable modem through the USB port.
Do not connect
both
the Ethernet and USB cables to the same computer.
Cable outlet
Coaxial cable
Computer
USB cable
Ethernet crossover
cable
Computer
SURFboard
cable modem
Cable outlet
Coaxial cable
Computer
Ethernet hub
or switch
USB cable
Computer
Computer
Computer
Ethernet crossover
cable
Ethernet cable
SURFboard
cable modem
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FAQ
Troubleshooting
Glossary
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Ethernet
You can connect up to 32 computers to an Ethernet hub connected to a SURFboard
cable modem, as shown at left.
Cable outlet
Coaxial cable
Ethernet crossover cable
Ethernet hub
or switch
Computer
Computer
Computer
Ethernet cable
SURFboard
cable modem
Page 48 / 74
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Glossary
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Troubleshooting
If the solutions listed here do not solve your problem, contact your cable service provider. Before calling your service provider, try unplugging and
plugging in the cable modem power cord in the AC wall outlet to restart the cable modem. Restarting the cable modem may take 5 to 30 minutes.
Before calling your service provider, try pressing the reset button on the rear panel. Resetting the cable modem may take 5 to 30 minutes. Your
service provider may ask for the status of the front-panel lights as described in
“Front-Panel Lights and Error Conditions”
on page 44.
Problem
Possible Solutions
Green POWER light is off
Check that the power cord is properly plugged into the electrical outlet and the cable modem.
Check that the electrical outlet is working.
If the Standby light is on, the Internet connection is off. Press the Standby button to reconnect to the Internet.
Page 49 / 74
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Glossary
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Cannot send or receive data
Check the lights on the front panel. Note the first light from top to bottom that is off. This light indicates where
the error occurred as described in
“Front-Panel Lights and Error Conditions”
on page 44.
If all lights are off except the Standby light, the cable modem is in Standby mode. Press the Standby button to
reconnect your Internet service.
If you have cable TV, check that your TV is working and the picture is clear. If you cannot receive your regular
TV channels, your data service will not function.
Check the coaxial cable at the cable modem and wall outlet. Hand-tighten if necessary.
Check the IP address. Follow the steps in
“Verifying the IP Address in Windows 95, Windows 98, or Windows
Me”
on page 37 or
“Verifying the IP Address in Windows 2000 or Windows XP”
on page 38. Call your cable
service provider if you need an IP address.
Check that the USB or Ethernet cable is properly connected to the
cable modem
and your computer.
Problems related to unsuccessful
USB driver installation
Remove the USB driver. Follow the instructions in
one
of:
•
“Removing the USB Driver from Windows 98 or Windows Me”
on page 45
•
“Removing the USB Driver from Windows 2000”
on page 49
•
“Removing the USB Driver from Windows XP”
on page 54
Problem
Possible Solutions
Page 50 / 74
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FAQ
Troubleshooting
Glossary
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Front-Panel Lights and Error Conditions
For more information about the lights, see
“Top and Front Panel”
on page 2.
Light
Turns Off During Startup If
Turns Off During Normal Operation If
Receive
The receive channel cannot be acquired
The receive channel is lost
Send
The send channel cannot be acquired
The send channel is lost
Online
IP registration is unsuccessful
The IP registration is lost
Power
The cable modem is not properly plugged into
the power outlet
The cable modem is unplugged or is in standby
mode. Press the Standby button

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