NETGEAR CM400 Quick Start

Quick Start

High Speed Cable Modem
Model CM400

Package Contents

Cable modem
Ethernet cable
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 off 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, Comcast XFINITY recommends connecting
your cable modem directly to a cable wall outlet.
Note:
If Charter is your cable Internet provider,
Charter recommends connecting your cable modem
directly to a cable wall outlet. If you must use a
splitter, use a splitter that is rated at 3.5 dBmv.
4. Connect the power adapter.
Attachable feet
Connect the power adapter to the cable modem
and plug the power adapter into an electrical
outlet.
When the startup procedure is completed, the
Power LED
Power adapter
5. Wait for the cable modem
to come online.
The cable modem comes
online when the Internet
LED stops blinking and
lights solid green.
lights green.
This process might take up
to 10 minutes.
Power adapter
Ethernet cable
Coaxial cable
(not included)
Cable modem
6. Connect a computer to the 7. Activate your Internet service.
cable modem.
Use the Ethernet cable that is
provided in the package to connect
a computer to the Ethernet port on
the cable modem.
Reboot the computer.
Computer
For information about how to
activate your Internet service, see
Activate Your Internet Service on the
other side of this quick start guide.
Note: After 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
on the other side of this quick start
guide.