Submitted Dave Astle, Jan 18 2005 12:44 PM | Last updated Jan 18 2005 12:44 PM
Symmetric Digital Subscriber Line.
This is a high-speed internet connection which, like a cable modem, runs at very high speeds. Unlike conventional ADSL (Assymetric Digital Subscriber Line), however, an SDSL connection is "symmetric" -- it receives data just as fast as it sends data, and in both cases, this is very fast. However, SDSL requires its own special line -- whereas ADSL runs through a normal phone line -- and is very expensive.