In order to run xbox live first you must have a compatible ISP and then the compatible networking devices. I'll provide you with the compatible isp's but to see the list of devices click on the link below.
Compatible ISP's:
Adelphia
AT&T
Charter Communications
Comcast
Cox
EarthLink
Mediacom Online
Qwest
RoadRunner
Rogers
Sympatico
Telus
Verizon
Videotron
Compatible Equipment