Quick Start
High Speed Cable Modem
Model CM400
Package Contents
Cable modem
Ethernet cable Power adapter
Coaxial cable
(not included)
Power adapter
Cable modem
Ethernet cable
Attachable feet
5. Wait for the Online LED to light green.
This process might take up to 10 minutes.
Note: When the Online LED lights, your cable
modem is not connected to the Internet yet.
You must activate your cable modem with your
Internet service provider.
6. Connect your computer to the cable modem.
Use an Ethernet cable to connect a computer to
the Etherent port on the cable modem.
Reboot the computer
1. Collect your cable Internet provider
information.
Collect your cable account number, account
phone number, and login information (your email
address or user name and password).
2. Turn o and disconnect existing modems
and routers.
If you are replacing a modem that is currently
connected in your home, unplug the modem and
plug the new cable modem into the same outlet.
3. Connect a coaxial cable.
Use a coaxial cable that is provided by your
cable company to connect the cable port on
the cable modem to a cable wall outlet or a line
splitter.
Make sure that the cable is tightly connected.
Note: If Comcast Xfinity is your cable Internet
provider, Xfinity recommends connecting your
cable modem directly to a cable wall outlet.
4. Connect the power adapter.
Connect the power adapter to the cable modem
and plug the power adapter into an electrical
outlet.
7. Activate your Internet service.
For information about how to activate your
Internet service, see Activate Your Internet
Service.
Note: Aer you install and activate the
cable modem you can disconnect the computer
and connect a router to the cable modem. For
more information see Connect a Router.
Computer
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General
Weight and Dimensions
