Check Best Price: goo.gl for Sale Motorola SB6120 SURFboard DOCSIS 3.0 eXtreme Broadband Cable Modem I was renting a modem from Comcast for $4 per month which really was horrible. The modem would crash, reboot, not work, etc... I spoke to some Comcast tech's on Twitter and they recommended I go and buy this modem since it was not yet being distributed by them in my area. Voila, off to Amazon I went. I purchased the modem, it arrived the next day. I turned everything off....router, computer, etc. The setup was as follows: A. Plug cable into new modem. B. Plug ethernet cable from modem to your computer (first time only). C. Power up modem. D. Power up computer. E. For Comcast - Web page comes up that allows you to change your modem. F. Enter some details....ie. your account number, etc. G. DONE....shutdown modem, and plug ethernet cable to Router. H. Enjoy DOCSIS 3.0