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 ?
Conexant Systems Inc has introduced what it claims to be the industry's first 8-port asymmetric digital subscriber line (ADSL) chipset that integrates each port's analogue front end and line driver into a single device.
Extending their efforts to bring high-speed, "always-on" Internet service to consumers and businesses, Compaq (NYSE: CPQ) and Texas Instruments (NYSE: TXN) announced that TI's programmable digital signal processor (DSP) and analog-based asymmetric digital subscriber line (ADSL) modem chipsets will power Compaq's market-leading line of Presario Internet PCs.
Bell Altantic, one of the largest US local telephone service providers, is making Alcatel its primary vendor for asymmetric digital subscriber line, a technology known as ADSL.
ADSL (Asymmetric Digital Subscriber Line) is a technology that lets people use standard telephone lines to connect to the Internet and data networks at speeds more than 100 times previously possible.
KPN intends to introduce IPTV services nationally, for its broadband asymmetric digital subscriber line (ADSL) network customers, as part of its triple-play protocol and plans to introduce VoD during the first half of this year.
A wireless local area network used in the experiment, conducted on a 10-kilometer track of a JR line in Hokkaido, can transmit data at a speed of up to 15 megabits, which is comparable to the capacity of asymmetric digital subscriber line services, Japan Telecom said.
Based on Asymmetric Digital Subscriber Line (ADSL) technology, the FlexRate 150 service offers private households an ability to access the Internet at speeds of 2,048/512 kbit/s.
ADSL (asymmetric digital subscriber line) provides high-speed data transmission through fixed telephone lines and enables computer users to browse the Internet at speeds dozens of times faster than other systems.
Meanwhile, pan-European communications firm Atlantic has launched ADSL (asymmetric digital subscriber line) services to more than half a million UK small and medium-sized businesses.
The Internet-based services provider Nextra is to expand the ADSL (Asymmetric Digital Subscriber Line) offerings it currently provides in Europe.
The data highlighted more subscribers favoring faster fiber-optic services over asymmetric digital subscriber line and other broadband Internet access services in relatively large cities, the ministry said.

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