Hardware and Internet Setup
CM400 High Speed Cable Modem
Cable Your Cable Modem
The cable modem provides a connection between your cable Internet provider’s network and
your computer, router, or WiFi router.
Coaxial cable to cable outlet
Figure 6. Cabling the cable modem
To cable your cable modem:
1. Connect a coaxial cable.
Use the coaxial cable that your cable company provides to connect the cable port on the
cable modem to a cable wall outlet or a line splitter.
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.
Note: If Comcast Xfinity is your cable Internet provider, Comcast Xfinity
recommends connecting your cable modem directly to a cable wall
2. Connect the power adapter provided in the package to the cable modem and plug the power
adapter into an electrical outlet.
The Power LED lights green.
3. Turn off the computer, router, or WiFi router to which you intend to connect the cable
4. Use the Ethernet cable provided in the package to connect the Gigabit Ethernet port on the
cable modem to an Ethernet port on a computer, router, or WiFi router.