Asymmetric Digital Subscriber Line

(redirected from Adsl2)
Also found in: Acronyms.

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
This article is provided by FOLDOC - Free Online Dictionary of Computing (
References in periodicals archive ?
13,457 Census blocks in Cuyahoga County are served by AT&T with ADSL2, VDSL, or FTTH service.
ADSL2 copper-based broadband is available in more than half of North East homes so far, while high-speed ethernet is available on 32 nodes in the North East.
The high-tech company's solutions are used for physical-layer testing of xDSL technologies such as G.SHDSL, ADSL, ADSL2, ADSL2+, and VDSL2.
Both routers can be used on any ADSL, ADSL2 or ADSL2+ type of Internet connection, as they both have a modem built-in, and provide advanced security features to prevent unauthorised access to the network.
They will also benefit from the reliable, high-speed ADSL2 connectivity of Opal's network.
The platform -- which is interoperable with ADSL2+, ADSL2, ADSL and VDSL1 -- is designed to deliver the flexibility that carriers need to serve a variety of consumers, from those wanting high-value triple play services to those needing only broadband Internet access.
It also supports ADSL2+, alongside ADSL and ADSL2, for applications able to benefit from its increased reach and higher bandwidth of up to 25Mb/s.
The DSL-G804V offers integrated ADSL2/2+ supporting up to 24Mb/s downstream and 1Mb/s upstream (ADSL2+), or 12Mb/s downstream and 1Mb/s upstream (ADSL2).
Fully compatible with digital transmission standards such as ADSL2 and ADSL2+, the SMP80MC family of micro-capacitance transient surge arrestors is the first TRISIL series for which the junction capacitance does not depend on the device breakdown voltage.