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Digital subchannel
Digital television in the United States supports multiple digital subchannels if the 19.4 Megabits-per-second (Mbit/s) bitstream is divided. Full quality 1080i HDTV requires 18 Mbit/s; however, many stations compress this down to 11 Mbit/s. A 720p HDTV signal can be compressed to 8 Mbit/s, and a SD signal compressed to 6 Mbit/s without perceivable loss of quality. 4 Mbit/s or less yields acceptable results if the subject in the video moves very little (such as a slideshow automated weather channel).
Digital subscriber line
DSL or xDSL, is a family of technologies that provide digital data transmission over the wires of a local telephone network. DSL originally stood for digital subscriber loop, although in recent years, many have adopted digital subscriber line as a more marketing-friendly term for the most popular version of consumer-ready DSL, ADSL.
Digital subscriber line access multiplexer
A Digital Subscriber Line Access Multiplexer (DSLAM) allows telephone lines to make faster connections to the Internet. It is a network device, located near the customer's location, that connects multiple customer Digital Subscriber Lines (DSLs) to a high-speed Internet backbone line using multiplexing techniques. By locating DSLAMs at locations remote to the telephone company central office (CO), telephone companies are now providing DSL service to consumers who previously did not live close enough for the technology to work.
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