Asymmetric Digital Subscriber Line

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asymmetric digital subscriber line

[¦ā·sə′me·trik ¦dij·ə·dəl ‚səb′skrī·bər ‚līn]
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 ?
HCTC will pull 151 miles of fiber optic cable deep into its network and leverage asynchronous digital subscriber line 2 plus (ADSL2+) over the remaining last mile copper to bring advanced broadband services to more than 550 subscribers in the most rural parts of its serving area.
a leading supplier of data communication products, today announced the E100 series of high-performance Asynchronous Digital Subscriber Line (ADSL) routers.
Tainet will include Virata's Helium(TM) semiconductor and related networking and protocol software in its new universal serial bus (USB) asynchronous digital subscriber line (ADSL) modems, which will be geared towards home and small business users.
According to Randy Strahan, president and CEO of Telmax, "We are looking forward to collaborating with Jetstream in taking DSL to the next level by integrating voice and data over high-speed Asynchronous Digital Subscriber Line (ADSL) services.
The solution, which combines 3CX's ixJet(TM) Live & Streaming Server software and Digicom's Asynchronous Digital Subscriber Line (ADSL) modem technology, will be showcased at Comdex Fall '98 on November 16-20 (Booth S2620 at the Sands Convention Center).
These organisations will benefit from centralized, shared services delivered over symmetrical broadband connections of up to 2 gigabit per second, which is more than 100 times faster than typical asynchronous digital subscriber line (ADSL) connections.
Asynchronous Digital Subscriber Line (ADSL) is an emerging telephony service that provides up to 8 Mbps data access, delivering 150 times the speed of today's 56 Kbps analog modems.

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