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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 10 – Glossary 359

RobbedBitSignalingAsignalingschemethat“borrows”bitsoneachT1channelforuseas

signalingchannels.OnSFT1’stherearetwobits,theAbitandtheBbitineachdirection.OnESF

T1’sthereisalsoaCandDbitineachdirection,althoughtheyar

erarelyused.Usingthesebits,

variousolderanalogtrunkinterfacescanbeemulatedoveraT1.Forinstance,dialpulseaddress

signalingusing10pulsepersecond(rotarystyle)digitgroupsoverthesebits.Sincerobbedbit

signalinginterfereswiththeleastsignificantbit,only7bitscanbeusedforsens

itivedata

applications,leavingonlya56kbpschannelfordataapplications.SeealsoCASandCCIS.

RolloverSeeHuntGroup

SinterfaceTheelectricalinterfacebetweentheNT1andtheTerminalAdapterorotherISDN

equipment.ISDNequipmentwithbuilt‐inNT1’sdonotnecessarilyprovideaccesstotheS

interface(theZephyrXstre

am,Zephyr,ZephyrExpressandTelosTWOdo).Multipledevicescan

shareanNT1byconnectingontheSinterface.AlsoknownastheSpassivebus.

S׎EuropeantermforISDNBRI.SeeBRIandISDN2.

S2MEuropeantermforISDNPRI.SeePRIandISDN30

SealingC

urrentUnliketelegraphy,teletypewriterandPOTSlines,mostdigitallines(suchas

ISDN)useavoltageratherthancurrentmodeofoperation.SealingCurrentallowsacontrolled

amountofcurrenttobepassedthroughatelecomcircuitforpurposesof“healing”resistive

faultscausedbycorrosion.BellcorespecifiessealingcurrentontheISDNUinterfaceintheUS

A.

TheSiemensEWSDswitchdoesnotprovidesealingcurrent.MostotherISDNcapableswitches

usedinNorthAmericado.

SF‐SuperframeAtypeofLineformatsupportedonT1circuits.TheTelcodeterminestheline

formatandlineencodingofyourline.ESFisth

epreferredLineFormatonT1circuits.SeeLine

Format.

SilenceSuppressionSeeStatisticalMultiplexing.

SLC‐96ASubscriberLoopCarrierCircuitsystemmanufacturedbyAT&T(nowLucent).SLC‐96

hasitsownversionofT1framingbetweenitandtheCO.SLC‐96andsimilar"SLIC"systemsmay

ormaynotperformaconcentra

tionfunction.TheinterfaceistheBellcoreTR‐008orthenewer

GR‐303interfacesthatarespecializedversionsofT1intendedtoallowtransparenttransportof

analogCLASSfeaturessuchasCallerID,CallWaiting,etc.TheGR‐303interfaceisspecifically

intendedtobeusedasacommonpointofinterconnectionbe

tweenalternativeequipment,

technologies,and/ornetworks(i.e.voice‐over‐DSL,voice‐over‐IP,etc))andthepublicswitched

network.SeethefollowinglinkforadditionalinformationfromTelcordia:

http://www.telcordia.com/resources/genericreq/gr303/index.html

SLIC1)SubscriberLineInterfaceCircuit,see“LineCard”.2)TheequipmentusedwiththeAT&T

(Luc

ent)SLCCSubscriberLoopCarrierCircuit,asystemusedtomultiplexanumberofsubscriber

loopsontoasinglecircuit(usuallyaT1circuit)toreducefixedcosts.3)Alsosometimesused

genericallyforotherbrandsofsimilarequipment.SeealsoSLC‐96.

SPID‐ServiceProfileIden

tifierOnthe“NationalISDN”,“AT&TCustomPMP”and“Custom

DMS”ISDNBRIprotocols,theTelcoswitchmustreceivecorrectSPID(s)fromtheCPEbeforeit

willallowaccesstoISDNservice.IntendedtoallowmultipleconfigurationsonISDNlinesshared

amongdifferenttypesofCPEequipment.WhileyourSPIDmayi

ncludeyourareacodeand

telephonenumber,theSPIDisdistinctfromthetelephonenumber.FortheNationalISDN,

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