Comcast is the largest cable TV provider in the U.S., with 23 million subscribers as of the first quarter 2011. The company’s XFINITY TV offers different options when it comes to selecting a programming package, including access to high-definition (HD) channels. With most TVs, a set-top receiver box or DVR will be needed to view the HD channels in Comcast’s digital service, and Comcast uses boxes from different manufacturers, with the majority coming from Motorola. Writer Bio
