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Rate-Adaptive Digital Subscriber Line - Wikipedia, the free encyclopedia

Rate-Adaptive Digital Subscriber Line

From Wikipedia, the free encyclopedia

For RE-ADSL2, see ITU G.992.5 Annex L
DSL technologies
Technology ITU-standard
ADSL ANSI T1.413 Issue 2
ITU G.992.1 (G.DMT)
ITU G.992.2 (G.Lite)
ADSL2 ITU G.992.3/4
ITU G.992.3 Annex J
ITU G.992.3 Annex L
ADSL2+ ITU G.992.5
ITU G.992.5 Annex L
ITU G.992.5 Annex M
HDSL ITU G.991.1
HDSL2  
IDSL  
MSDSL  
PDSL  
RADSL  
SDSL  
SHDSL ITU G.991.2
UDSL  
VDSL ITU G.993.1
VDSL2 ITU G.993.2

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 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 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.

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