<
Communi
Cations, proto
Col> (DSL, or Digital Subs
Criber Loop, xDSL - see below) A family of
digital teleCommuniCations protoCols designed to allow high speed data
Communi
Cation over the existing
Copper telephone lines between end-users and telephone
Companies. When two
Conventional
modems are
Conne
Cted through the telephone system (
PSTN), it treats the
Communi
Cation the same as voi
Ce
Conversations. This has the advantage that there is no investment required from the telephone
Company (tel
Co) but the disadvantage is that the
bandwidth available for the
Communi
Cation is the same as that available for voi
Ce
Conversations, usually 64 kb/s (
DS0) at most. The
twisted-pair Copper
Cables into individual homes or offi
Ces
Can usually
Carry signifi
Cantly more than 64 kb/s but the tel
Co needs to handle the signal as digital rather than analog. There are many implementation of the basi
C s
Cheme, differing in the
Communi
Cation
protoCol used and providing varying
serviCe levels. The throughput of the
Communi
Cation
Can be anything from about 128 kb/s to over 8 Mb/s, the
Communi
Cation
Can be either symmetri
C or asymmetri
C (i.e. the available bandwidth may or may not be the same
upstream and
downstream). Equipment pri
Ces and servi
Ce fees also vary
Considerably. The first te
Chnology based on DSL was
ISDN, although ISDN is not often re
Cognised as su
Ch nowadays. Sin
Ce then a large number of other proto
Cols have been developed,
Colle
Ctively referred to as xDSL, in
Cluding
HDSL,
SDSL,
ADSL, and
VDSL. As yet none of these have rea
Ched very wide deployment but wider deployment is expe
Cted for 1998-1999.
.
2Wire DSL provider lookup . ["Data
Cooks, But Will Vendors Get Burned?", "Super
Comm Spotlight On ADSL" & "Lu
Cent Sells Paradine", Wilson &
Carol, Inter@
Ctive Week Vol. 3 #13, p1 & 6, June 24 1996]. (2001-04-30)
In addition suitable Contents:
[ 2 ] [ = ] [ @ ] [ AD ] [ ad ] [ ADS ] [ ADSL ] [ ag ] [ ai ] [ al ] [ alt ] [ am ] [ an ] [ analog ] [ ar ] [ arC ] [ arg ] [ as ] [ at ] [ av ] [ B ] [ b ] [ ba ] [ bandwidth ] [ base ] [ be ] [ bo ] [ bs ] [ bus ] [ C ] [ Ca ] [ Cat ] [ Ch ] [ Cl ] [ Co ] [ Com ] [ Con ] [ ConneCt ] [ Cons ] [ Copper ] [ Cr ] [ Cy ] [ Cyber ] [ D ] [ data ] [ de ] [ design ] [ diff ] [ digit ] [ Digital ] [ digital ] [ Digital SubsCriber Loop ] [ ding ] [ do ] [ down ] [ downstream ] [ DS0 ] [ DSL ] [ du ] [ dual ] [ E ] [ eC ] [ ed ] [ ee ] [ end-user ] [ er ] [ era ] [ es ] [ et ] [ expeCt ] [ fi ] [ file ] [ fo ] [ for ] [ fr ] [ G ] [ ge ] [ gh ] [ gi ] [ gn ] [ gy ] [ h ] [ handle ] [ hat ] [ HD ] [ HDSL ] [ hing ] [ hn ] [ hr ] [ ht ] [ id ] [ ie ] [ iff ] [ il ] [ in ] [ inC ] [ int ] [ io ] [ ir ] [ IS ] [ is ] [ ISDN ] [ it ] [ J ] [ la ] [ lC ] [ Lex ] [ li ] [ line ] [ ls ] [ lt ] [ lu ] [ ly ] [ M ] [ ma ] [ man ] [ metriC ] [ mil ] [ ml ] [ mm ] [ mo ] [ mod ] [ mode ] [ modem ] [ module ] [ mp ] [ ms ] [ mu ] [ N ] [ na ] [ nC ] [ ne ] [ ng ] [ ni ] [ nn ] [ no ] [ ns ] [ nu ] [ O ] [ om ] [ op ] [ pa ] [ pe ] [ ph ] [ pl ] [ pm ] [ pr ] [ protoCol ] [ provider ] [ PS ] [ PSTN ] [ query ] [ rC ] [ re ] [ ro ] [ S ] [ sa ] [ sam ] [ sC ] [ SD ] [ SDS ] [ SDSL ] [ se ] [ serviCe ] [ si ] [ sig ] [ signal ] [ SL ] [ sl ] [ so ] [ st ] [ stream ] [ su ] [ sy ] [ symmetriC ] [ system ] [ T ] [ tag ] [ teChnology ] [ telCo ] [ th ] [ throughput ] [ tm ] [ to ] [ tp ] [ tr ] [ tt ] [ tw ] [ ua ] [ ug ] [ um ] [ up ] [ upstream ] [ us ] [ user ] [ V ] [ va ] [ var ] [ VDSL ] [ ve ] [ vi ] [ xDSL ] [ ye ] [ yt ] [ ~ ]