Overview 
 
xDSL Refers collectively to all types of digital subscriber lines, in which the two main categories: the asymmetric DSL (ADSL) and the symmetric DSL (SDSL)Other important types of xDSL technologies are High-data-rate DSL (HDSL) and Very high DSL (VDSL).
 
xDSL is technology backed by telephone companies to provide next generation high bandwidth services to the home and business using the existing telephone cooper cabling infrastructure. 
 
 xDSL to the home over existing phone lines promises bandwidths up to theoretically 8.448 megabits per second and more, but distance limitations and line quality conditions can reduce the data rate. 
xDSL technologies uses a greater range of frequencies over the telephone cable than the traditional telephone services have used.  This in turn allows for greater bandwidth with which to send and receive information, enabling for example continuous transmission of motion video, audio, and even 3-D effects.

xDSL technology has evolved greatly over the past few years, and is still in development toward achieving even a greater bandwidth as demand rises.  Driving this market is the competition from competing access providers for the consumers hard earned cash.

 
Next: History

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