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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 10 – Glossary 355

LineFormat,T1ModernT1circuitsusuallyuseeitherSuperframe(sometimescalledSForD4)

orExtendedSuperframe(sometimescalledESF)lineformatting.Thetypeofframingusedis

determinedbyyourTelco.ESFispreferred.SeeESFandSF

LineSideThisisthesideofacentralofficeswitchtha

tthesubscriber'stelephonelinesare

connectedto.Themainreasonfordistinguishingbetweenthisandthetrunksideisthatcertain

customerrelatedfeatures(SuchasCLASSandCentrexfeatures)areinapplicabletotrunks.See

alsoTrunkSide.2)TheusersideofaPBX.Alsocalledthestationside.

LineTermination

SeeLT.

Livewire

TM

ThisisthetradenameusedbyAxiaAudio(adivisionofTelos‐Systems)todescribe

theaudiostreamsutilizedintheirnetworkedaudiosystem.

LocalAccessandTransportAreaSeeLATA.

LocalExchangeCarrierSeeLECandCLEC.

LongDistance IfyourlocalTelcoisaformerBellOperatingCompanyth

enanycalloutsideof

yourLATAoranyInterstatecallisconsideredlongdistanceandishandledbyanIEC.Theabove

istrueregardlessofwhetheryouarereferringtoadedicatedlineoradialupcall.2)However,

underthecurrentstateofderegulation,tollcallswithinaLA

TAmaynowbecoveredbytheIEC,

andinsomecasesRBOCsarebeingpermittedtohandleInterLATAcalls.

LoopThetelephonecircuitfromtheCOtothecustomer’spremises.Generallyreferstoa

coppercablecircuit.

LoopCurrentDisconnectSupervisionAnothernameforCPC.SeeCPC

LoopQ

ualificationProcessofactuallymeasuringthelossonaprospectiveISDNlinetoseeifit

canbeusedforISDNservice.Theactuallossontheline(usuallymeasuredat40kHz)isthe

determiningfactorwhetherISDNservicecanbeofferedwithoutarepeater.GenerallyISDNis

availableupto18,000feetfromtheser

vingCentralOffice.Itmaynotbeavailablewithinthis

range,ormaybeavailablefurtherfromtheCO.Onlyaloopqualificationcantellforsure.Notall

TelcoswillextendISDNlineswithrepeaters.

LoopStartLineAplainoldtelephoneline.Thetel

ephoneterminalsignalsthe“offhook”

conditionbyallowingDCcurrenttoflow.SeeGroundStartTrunk.SeealsoGlare.

LoopStartTrunkAplainoldtelephonelineconnectedtoaPBXswitch.SeeLoopStartLine.The

PBXsignalsthe“offhook”conditionbyallowingDCcurrenttoflo

w.GroundStartTrunksare

generallypreferredforuseonPBXstopreventglare.SeeGroundStartTrunk.SeealsoGlare.

TheTelcomaycallthisa“LoopStartLine”.

LOSLossOfSignal.AnLEDorotherindicatorthatilluminatesifasignalisabsent.This

terminologyiscommonlyusedwithT‐1equi

pment.

LT‐LineTerminationTheelectricalandprotocolspecificationsfortheCentralOfficeendofan

ISDNline.IfyouwishtoconnectanISDNterminal(suchasaZephyrXstream)toaPBXthePBX

mustsupportLTISDN.SeealsoNTandLineCard

LucentTe

chnologiesCompanywhichnowmakestheformerAT&T5ESSswitch,aswellas

variousotherpieceofTelcogearandsemiconductors.LucentwassplitofffromAT&Tin1996

andownsBellLabs.Asofapproximately1999Lucentsoldtheirtelephonesetmanufacturing

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