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Topic: Asymmetric Digital Subscriber Line

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  Asymmetric Digital Subscriber Line - Wikipedia, the free encyclopedia
Asymmetric Digital Subscriber Line (ADSL) is a form of DSL, a data communications technology that enables faster data transmission over copper telephone lines than a conventional modem can provide.
With standard ADSL (annex A), the band from 25.875 kHz to 138 kHz is used for upstream communication, while 138 kHz – 1104 kHz is used for downstream communication.
ADSL technologies use a synchronous framed protocol for data transmission on the wire.
en.wikipedia.org /wiki/Asymmetric_Digital_Subscriber_Line   (1342 words)

 Digital Subscriber Line - Wikipedia, the free encyclopedia
Digital Subscriber Line technology was originally implemented as part of the ISDN specification.
ADSL technology dates back to 1988, when Joe Lechleider at Bellcore (now Telcordia Technologies) adapted DSL to carry a digital signal over the unused frequency spectrum available on the twisted pair cables running between the telephone company's central office and the customer premises.
This converts data from the digital signals used by computers into a voltage signal of a suitable frequency range which is then applied to the phone line.
en.wikipedia.org /wiki/Digital_Subscriber_Line   (1613 words)

 Digital Subscriber Line (DSL)
ADSL transmits more than 6 Mbps to a subscriber, and as much as 640 kbps more in both directions (shown in Figure 15-1).
ADSL modems provide data rates consistent with North American T1 1.544 Mbps and European E1 2.048 Mbps digital hierarchies (see Figure 15-2) and can be purchased with various speed ranges and capabilities.
Line attenuation increases with line length and frequency and decreases as wire diameter increases.
www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/adsl.htm   (3937 words)

 definition: asymmetric digital subscriber line (ADSL) | Motive Glossary
ADSL is a digital communication technology standard that enables telephone lines to send and receive data (as well as analog information).
The connection is ‘asymmetric’ in that more of the channel is allocated to receiving data (downloading) than sending (uploading).
The downstream speed of an ADSL connection starts at 512 Kbps (10x faster than standard dial-up speed of 51.2 Kbps) and ranges up to 6Mbps (6,000 Kbps) with download performance tending to the lower speed.
www.motive.co.nz /glossary/adsl.php   (102 words)

 SLT - Asymmetric Digital Subscriber Line
With ADSL your Internet connection is "always on", you have unlimited access to the Internet and you benefit from fast downloading speeds.
Furthermore, with one telephone line you are simultaneously connected to the phone and the net.
ADSL stands for Asymmetric Digital Subscriber Line, where a normal telephone line becomes a high speed digital link.
www.sltnet.lk /adsl/index.htm   (234 words)

 Digital Subscriber Line
In asymmetric digital subscriber line (ADSL), the voice frequency band of 300 Hz is blocked and redirected to a telephone set and all other frequencies are passed through to the modem or transceiver.
In informal common usage in digital communications, bandwidth is used to indicate the maximum transmission rate of a facility in bits per second (for example, 4800 bps), or the information carrying capacity of a medium or system.
ADSL technology, for example, has a frequency range of 30 kHz to 1.1 MHz that can be divided into two nonoverlapping areas used for upstream and downstream transmission.
www.gtidsl.com /glossary.htm   (6202 words)

 Asymmetric Digital Subscriber Line: Interim Technology for the Next Forty Years
ADSL is asymmetric - high-speed downstream, lower-speed upstream - to counteract speed limitations imposed by line length and crosstalk.
ADSL beats this problem by sending in one direction only - downstream - with a much lower upstream rate separated from the downstream by frequency division multiplexing (some echo cancellation is possible at low frequencies).
The ADSL Forum and T1E1.4 are close to approving an ATM interface and cell pump mode in which the ADSL modem performs ATM TC layer functions such as cell delineation, rate decoupling, header error correction (HEC) generation and verification, framing, and FEC signal path identification.
www.comsoc.org /ci1/private/1996/oct/Maxwell.html   (6146 words)

 What is ADSL? - a definition from Whatis.com - see also: Asymmetric DSL, Asymmetric Digital Subscriber Line
ADSL (Asymmetric Digital Subscriber Line) is a technology for transmitting digital information at a high bandwidth on existing phone lines to homes and businesses.
ADSL is asymmetric in that it uses most of the channel to transmit downstream to the user and only a small part to receive information from the user.
ADSL is generally offered at downstream data rates from 512 Kbps to about 6 Mbps.
searchnetworking.techtarget.com /sDefinition/0,,sid7_gci213764,00.html   (309 words)

 Digital Subscriber Line
Digital Subscriber Line (DSL) technology is a modem technology that uses existing twisted-pair telephone lines to transport high-bandwidth data, such as multimedia and video, to service subscribers.
ADSL can literally transform the existing public information network from one limited to voice, text, and low-resolution graphics to a powerful, ubiquitous system capable of bringing multimedia, including full-motion video, to every home this century.
ADSL modems provide data rates consistent with North American T1 1.544 Mbps and European E1 2.048 Mbps digital hierarchies (see Figure 21-2), and can be purchased with various speed ranges and capabilities.
www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/dsl.htm   (3693 words)

 ADSL (Asymmetric Digital Subscriber Line)
Asymmetric digital subscriber line is the new modem technology that converges the existing twisted-pair telephone lines into the high-speed communications access capability for various services.
This definition of the higher range of ADSL speeds is one that is yet to be proven; however, with changes in today's technology, one can only imagine that the speeds will be achievable.
Asymmetric, describes the difference between broadband downstream transmission (1 to 9 Mb/s) and narrowband upstream transmission (64 to 800 kb/s).
www.samhassan.com /ADSL.htm   (1288 words)

 Howstuffworks "How DSL Works"
ADSL divides up the available frequencies in a line on the assumption that most Internet users look at, or download, much more information than they send, or upload.
ADSL is a distance-sensitive technology: As the connection's length increases, the signal quality decreases and the connection speed goes down.
ADSL technology can provide maximum downstream (Internet to customer) speeds of up to 8 megabits per second (Mbps) at a distance of about 6,000 feet (1,820 meters), and upstream speeds of up to 640 kilobits per second (Kbps).
electronics.howstuffworks.com /dsl.htm   (1117 words)

 Digital Subscriber Line
Digital Subscriber Line is a technology based on the idea that data transmitted over twisted pair (P.O.T.S.) lines does not need to be converted from digital to analog and then back to digital, which is how modems work.
Instead the data is transmitted across the lines as digital data, which allows the phone company to use much wider bandwith in transmitting the data.
ADSL is called "asymmetric" because most of its two-way or duplex bandwidth is devoted to the downstream direction, sending data to the user.
networking.ringofsaturn.com /Telecommunications/DSL.php   (6347 words)

 Asymmetric Digital Subscriber Line - RSCI, The Science Classification Index   (Site not responding. Last check: 2007-10-23)
ADSL can use any of a variety of modulation techniques, but the ANSI and ETSI standards use DMT modulation schemes.
Because of the relatively low data-rate (compared to optical backbone networks) ATM is an appropriate technology for multiplexing time-critical data such as digital voice with less time-critical data such as Web traffic; ATM runs widely over ADSL technology to ensure that this remains a possibility.
ADSL radio is a hardware that can play directly web radio, without using a computer.
www.scienceindex.org /Asymmetric_Digital_Subscriber_Line.html   (568 words)

 Asymmetric Digital Subscriber Line
Asymmetric Digital Subscriber Line (ADSL) was a technology that has been available for about 10 years, and in 1998 the ADSL technology will take over the marketplace.
ADSL uses plain old telephone service (POTS) lines to achieve speeds currently of 4.4 Mbps (mega bits per second) in one direction, and eventually speeds as high as 8 to 50 Mbps.
Two ADSL phone lines which are simple POTS like twisted pair lines and cost the same as regular phone lines, can for almost no cost transmit both sides upload and download at up to 50 kbps.
www.thecomputershow.com /computershow/news/adsl.htm   (755 words)

 ADSL Asymmetric Digital Subscriber Line
ADSL is one of the options from the DSL family.
Most ISP are looking to ADSL as the new standard in not only Internet or data communications but also as the new standard in voice, video, and fax communication.
In the case of 1.5M, depending on your line quality and distance from the switch you could receive speeds as high as 1.5Mbps and as low as 385Kbps downstream or from the Internet to you and the number on the right is the uplink speed of 128Kbps upstream from you to the Internet.
arkansasusa.com /adsl   (1009 words)

 Digital Subscriber Line (xDSL) FAQ v20010108   (Site not responding. Last check: 2007-10-23)
The key to ADSL is that the upstream and downstream bandwidth is asymmetric, or uneven.
As a result, the ADSL signal is carried over all of the house wiring which results in lower available bandwidth due to greater noise impairments.
Digital methods are used as long as frequency response (bandwidth) is not a limitation.
www.faqs.org /faqs/datacomm/xdsl-faq   (8729 words)

 Asymmetric Digital Subscriber Line   (Site not responding. Last check: 2007-10-23)
(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.
burks.bton.ac.uk /burks/foldoc/27/8.htm   (182 words)

 CommsDesign - ADSL Technology Explained, Part 1: The Physical Layer   (Site not responding. Last check: 2007-10-23)
The lower part of the ADSL spectrum is for upstream transmission (from the customer to the CO) and the upper part of the spectrum is fordownstream transmission.
ADSL systems use a combination of interleaving and coding to correct the errors caused by impulse noise.
ADSL performance is also a function of the distance from the CO and service is often extremely limited or impossible on these long reaches.
www.commsdesign.com /csdmag/sections/feature_article/OEG20010221S0082   (3179 words)

 ADSL, Asymmetric Digital Subscriber Line
Asymmetric Digital Subscriber Line offers the benefits of the Information Superhighway without the expense or wait.
ADSL enables the delivery of switched digital video services now over the existing telephone infrastructure, composed primarily of copper wire pair, instead of waiting for the implementation of costly new cabling systems.
An ADSL circuit connects an ADSL modem on each end of a twisted-pair telephone line, creating three information channels -a high speed downstream channel, a medium speed duplex channel, and a plain old telephone service (POTS) channel.
www.4i2i.com /adsl.htm   (211 words)

 ADSL definition - isp.webopedia.com - The Glossary for Internet Service Providers
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 is growing in popularity as more areas around the world gain access.
isp.webopedia.com /TERM/A/ADSL.html   (293 words)

 Asymmetric digital subscriber line control system (US5461616)
The ADSL control system includes a unit for allocating an unused image signal line between the subscriber terminal and the exchange to the control signal line from the subscriber terminal to the exchange, and a unit for allocating 2 lines for each subscriber terminal at the exchange.
means for allocating the unused image signal line from the subscriber terminal to the exchange to transmit the control signal from the subscriber terminal to the exchange so as to use said unused image signal line from the subscriber terminal to the exchange as the control signal line; and
means for allocating two lines for each subscriber terminal at the exchange, said two lines including said unused image signal line.
www.delphion.com /details?pn10=US05461616   (200 words)

 Asymmetric Digital Subscriber Line   (Site not responding. Last check: 2007-10-23)
Asymmetric Digital Subscriber Line (ADSL), is a modem technology that can provide up to 9Mbit/s of bandwidth in the downstream direction from an exchange to a customer and up to 640 kbit/s in both directions over an existing telephone line.
At the time of writing, May 1999, significant developments are anticipated in this area, please refer to the intranet site mentioned in the introduction for updates.
High speed internet access is indicative of most interactive multimedia services to the home, as it is asymmetric in nature i.e.
www.compapp.dcu.ie /~bstone/CA552/GavinMcGowan/sld016.htm   (163 words)

 ADSL (Asymmetric Digital Subscriber Line) Definition
Stands for "Asymmetric Digital Subscriber Line." ADSL is a type of DSL, which is a method of transferring data over copper telephone lines.
While symmetrical DSL (SDSL) uploads and downloads data at the same speed, ADSL has different maximum data transfer rates for uploading and downloading data.
For example, an ADSL connection may allow download rates of 1.5Mbps, while upload speeds may only reach 256Kbps.
www.techterms.org /definition/adsl   (135 words)

Asymmetric digital subscriber line (ADSL) is a new modem technology that converts existing twisted-pair telephone lines into access paths for high-speed communications of various sorts.
ADSL can transmit more than 6 Mbps to a subscriber—enough to provide Internet access, video-on-demand, and LAN access.
ADSL Data Rates As a Function of Wire and Distance
www.iec.org /online/tutorials/adsl   (152 words)

 Asymmetric Digital Subscriber Line from FOLDOC
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 can carry digital data, analog voice, and broadcast MPEG2 video in a variety of implementations to meet customer needs.
Nearby terms: Astral « AST Research, Inc. « asymmetrical modulation «; Asymmetric Digital Subscriber Line » Asymmetric Digital Subscriber Loop » asynchronous »; Asynchronous Balanced Mode
ftp.sunet.se /foldoc/foldoc.cgi?Asymmetric+Digital+Subscriber+Line   (187 words)

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