The modem allows an Ethernet-compatible device to connect to high-speed Internet. Most service providers give you the choice of renting a modem or purchasing your own device.

Connect an Ethernet cable from the Comcast modem to the Ethernet port on your computer. If the modem connects to a router, unplug the Ethernet connector from the router and plug it in to your ...

Whenever i insert the ethernet cable (from modem) into the "Internet" port in the router i get no internet, i can't get an ip-address by renewing DHCP as i could on my old router.

The Terayon TJ 855 combines a DOCSIS (R) 2.0 cable modem, 4-port Ethernet router and integrated 802.11g Wi-Fi wireless router in a single package, supporting data rates up to 54 Mbits/s.