Asymmetric Digital Subscriber Line

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asymmetric digital subscriber line

[¦ā·sə′me·trik ¦dij·ə·dəl ‚səb′skrī·bər ‚līn]
(communications)
A broadband communication technology designed for use on conventional telephone lines, which reserves more bandwidth for receiving data (1-8 megabits per second) than for sending data (100-800 kilobits per second). Abbreviated ADSL.

Asymmetric Digital Subscriber Line

(communications, protocol)
(ADSL, or Asymmetric Digital Subscriber Loop) A form of Digital Subscriber Line in which the bandwidth available for downstream connection is significantly larger then for upstream. Although designed to minimise the effect of crosstalk between the upstream and downstream channels this setup is well suited for web browsing and client-server applications as well as for some emerging applications such as video on demand.

The data-rate of ADSL strongly depends on the length and quality of the line connecting the end-user to the telephone company. Typically the upstream data flow is between 16 and 640 kilobits per second while the downstream data flow is between 1.5 and 9 megabits per second. ADSL also provides a voice channel.

ADSL can carry digital data, analog voice, and broadcast MPEG2 video in a variety of implementations to meet customer needs.

["Data Cooks, But Will Vendors Get Burned?", "Supercomm Spotlight On ADSL" & "Lucent Sells Paradine", Wilson & Carol, Inter@ctive Week Vol. 3 #13, p1 & 6, June 24 1996].

See also Carrierless Amplitude/Phase Modulation, Discrete MultiTone.

ADSL Forum.
References in periodicals archive ?
HORIZON II supports several xDSL line technologies, including splitterless ADSL, which enables subscribers to purchase and quickly install an ADSL modem in their residence using existing wiring.
413 Discrete Multi-tone (DMT) standard which is now recognized as the industry standard for ADSL line code and has been adopted by the Universal ADSL Working Group (UAWG) and ITU for their emerging splitterless ADSL standard.
Major xDSL vendor announces full-rate and splitterless ADSL integration into product platform --
Availability of a standard DMT-based solution upgradable to the emerging splitterless ADSL standard proposed by UAWG and ITU.