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Lexikon

Digital Subscriber Line

(DSL, or Digital Subscriber Loop, xDSL - see below) A family of href="module.php?name=Lexikon&file=search&eid=1&query=digital">digital href="module.php?name=Lexikon&file=search&eid=1&query=telecommunications">telecommunications href="module.php?name=Lexikon&file=search&eid=1&query=protocols">protocols designed to allow high speed data communication over the existing href="module.php?name=Lexikon&file=search&eid=1&query=copper">copper telephone lines between end-users and telephone companies. When two conventional href="module.php?name=Lexikon&file=search&eid=1&query=modems">modems are connected through the telephone system (href="module.php?name=Lexikon&file=search&eid=1&query=PSTN">PSTN), it treats the communication the same as voice conversations. This has the advantage that there is no investment required from the telephone company (telco) but the disadvantage is that the href="module.php?name=Lexikon&file=search&eid=1&query=bandwidth">bandwidth available for the communication is the same as that available for voice conversations, usually 64 kb/s (href="module.php?name=Lexikon&file=search&eid=1&query=DS0">DS0) at most. The href="module.php?name=Lexikon&file=search&eid=1&query=twisted-pair">twisted-pair copper cables into individual homes or offices can usually carry significantly more than 64 kb/s but the telco needs to handle the signal as digital rather than analog. There are many implementation of the basic scheme, differing in the communication href="module.php?name=Lexikon&file=search&eid=1&query=protocol">protocol used and providing varying href="module.php?name=Lexikon&file=search&eid=1&query=service levels">service levels. The throughput of the communication can be anything from about 128 kb/s to over 8 Mb/s, the communication can be either symmetric or asymmetric (i.e. the available bandwidth may or may not be the same href="module.php?name=Lexikon&file=search&eid=1&query=upstream">upstream and href="module.php?name=Lexikon&file=search&eid=1&query=downstream">downstream). Equipment prices and service fees also vary considerably. The first technology based on DSL was href="module.php?name=Lexikon&file=search&eid=1&query=ISDN">ISDN, although ISDN is not often recognised as such nowadays. Since then a large number of other protocols have been developed, collectively referred to as xDSL, including href="module.php?name=Lexikon&file=search&eid=1&query=hDSL">hDSL, href="module.php?name=Lexikon&file=search&eid=1&query=SDSL">SDSL, href="module.php?name=Lexikon&file=search&eid=1&query=ADSL">ADSL, and href="module.php?name=Lexikon&file=search&eid=1&query=VDSL">VDSL. As yet none of these have reached very wide deployment but wider deployment is expected for 1998-1999. href="http://www.cyberventure.com/~cedpa/databus-issues/v38n1/xdsl.html">. href="http://www.2Wire.com/">2Wire DSL provider lookup . ["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]. (2001-04-30)

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