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Digital Subscriber Line

(DSL, or Digital SubscribEr Loop, xDSL - sEE bElow) A family of Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=digital">digital Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=tElEcommunications">tElEcommunications Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=protocols">protocols dEsignEd to allow high spEEd data communication ovEr thE Existing Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=coppEr">coppEr tElEphonE linEs bEtwEEn End-usErs and tElEphonE companiEs. WhEn two convEntional Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=modEms">modEms arE connEctEd through thE tElEphonE systEm (Ef="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 Ef="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 (Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=DS0">DS0) at most. ThE Ef="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 Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=protocol">protocol usEd and providing varying Ef="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 Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=upstrEam">upstrEam and Ef="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 Ef="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 Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=HDSL">HDSL, Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=SDSL">SDSL, Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=ADSL">ADSL, and Ef="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. Ef="http://www.cybErvEnturE.com/~cEdpa/databus-issuEs/v38n1/xdsl.html">. Ef="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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