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ADSL
Last modified: January 22, 1998

  Related Categories
   Internet Access
 Telecommunications
 
 
  Related Terms
   ISDN
 POTS
 SDSL
 
Short for asymmetric digital subscriber line, a new technology that allows more data to be sent over existing copper telephone lines (
POTS). ADSL supports data rates of from 1.5 to 9 Mbps when receiving data (known as the downstream rate) and from 16 to 640 Kbps when sending data (known as the upstream rate).

ADSL requires a special ADSL modem. It is not currently available to the general public except in trial areas, but many believe that it will be one of the more popular choices for Internet access over the next few years.

The ITU is currently defining an xDSL standard based on ADSL, called G.dmt.

Related Links

Article on cable modems Award Winning Page
This Byte magazine article, from September 1996, provides information on the development of technologies that will solve bandwidth problems, with information on cable modems, ADSL, copper vs. coaxial, phone and cable problems, and infrastructure debates. Updated on May 31, 1998

ISDN modem reviews - article Award Winning PageNew Content
CNET article (May 14, 1997) on their review of 22 ISDN modems. Included are their recommendations, performance results, and what to look for when buying an ISDN modem. This article also contains a guide to ordering ISDN in your area (and how much you can expect to pay), information about ISDN PCMCIA card products, and competing technologies. Updated on Jun 7, 1998

ADSL chipset
This article describes a chipset that conforms to the ADSL standard and was created by Analog Devices and partner Aware, Inc. Updated on Jan 18, 1998

ADSL Forum
Presents ongoing information about ADSL including applications, technology, systems, market information, and trials. There is also information about the Forum itself and a private section for members. Updated on May 22, 1998

ADSL Information and Resources
Contains an overview, technical description, description of capabilities, information about DMT and CAP, and Web related resources and links. Updated on May 19, 1998

ADSL technology overview
This GlobeSpan Technologies page contains an overview of ADSL technology and links to other DSL general overviews, white papers and data sheets. Updated on Nov 27, 1997

ADSL technology paper
This paper provides an introduction of ADSL transmission technology and contains sections on definitions, initials, acronyms, and symbols, ADSL modulation methods, and progress.

ADSL tutorial
Provides an overview of ADSL and then delves into the technical details, including Discrete Multitone (DMT) linecodes and Carrierless Amplitude Phase (CAP) modulation.

ADSL: A Darn Speedy Line?
Microsoft Internet Magazine article (May 1997) on what ADSL is and how it can provide an affordable alternative to ISDN. Includes links to related resources.

ADSL: Savior of Mankind or Spawn of the Devil?
Article by Walter Goralski and Gary Kessler (February, 1997) that takes a close look at the technology behind ADSL and xDSL. Updated on Feb 12, 1998

Windows Sources article on ADSL New Content
This Windows Sources article, from July 1996, describes ADSL technology and provides a glossary of terms. Updated on Jun 8, 1998

xDSL schemes - technical tutorial
Provides information on xDSL schemes with specific sections on ADSL, RADSL and HDSL. From the March 1997 issue of Data Communications Magazine. Updated on Jun 1, 1998

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