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Refers collectively to all types of digital subscriber lines, the two main categories being ADSL and SDSL. Two other types of xDSL technologies are High-data-rate DSL (HDSL) and Very high DSL (VDSL). DSL technologies use sophisticated modulation schemes to pack data onto copper wires. They are sometimes referred to as last-mile technologies because they are used only for connections from a telephone switching station to a home or office, not between switching stations. xDSL is similar to ISDN inasmuch as both operate over existing copper telephone lines (POTS) and both require the short runs to a central telephone office (usually less than 20,000 feet). However, xDSL offers much higher speeds - up to 32 Mbps for upstream traffic, and from 32 Kbps to over 1 Mbps for downstream traffic. Also see
Cable vs. DSL in Webopedia's "Did
You Know...?" section.
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 xDSL.com 
From TeleChoice Inc., this page contains information on xDSL technologies and links to news items, archives, background information, events, tutorials, vendors, and services and trials.
Everything DSL
A comprehensive site offering DSL information, glossary, FAQ's, Books, Reference, Technical Reports, News, DSL Request Forms, Messageboard, ISP Lists, Links and more.
Cable Modem Information
Provides links to sites that describe how cable modems work, as well as resources for software and tools, and information on sharing modems.
dsllife.com
Tutorial, news and information on DSL technology.
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