Rate-Adaptive Digital Subscriber Line: Difference between revisions

Revision as of 20:10, 30 May 2008

Revision as of 01:05, 26 June 2008

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'''Rate-adaptive DSL''' ('''RADSL''') is a variation of [[ADSL]] technology. With RADSL the modem adjusts the upstream speed of the connection (in an upstream/downstream speed tradeoff) depending upon the length and quality of the line between the [[DCE]] (Telephone Exchange) or [[DSLAM]] and the [[DTE]] (Modem), in an attempt to maintain a certain downstream speed.

When the modem connects using RADSL the [[upstream]] [[Bandwidth (signal processing)|bandwidth]]<!-- disambiguated by interpreting as the frequency band itself is adjusted --> is adjusted to create a greater frequency band for the downstream traffic. Using this technique the line is more tolerant of errors caused by [[Noise (physics)|noise]] and signal loss.

As the frequency is adjusted, the upstream bandwidth may be markedly decreased if there is a large amount of line noise or signal degradation - this may reduce the upstream [[bit rate]] to as little as 64 kbit/s - the same speed as a single [[ISDN]] [[B channel]].