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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 10 – Glossary 349

AlsocalledaBothWayTrunk.ThisisnotthesameasaTwo‐wayDIDtrunk.SeeDIDtrunk,Hunt

GroupandTrunk.

CommonChannelInterofficeSignalingSeeCCIS

CompetitiveLocalExchangeCarrierSeeCLEC.

ConcentrationThebasicpremiseistosharefacilitieswhereverpossible.Forinstance,while

theremaybethousandsofcusto

mersservedbyagivenCentralOffice,therewillbe

substantiallylessthanthatnumberofcallswhichcanbehandledsimultaneously.And,even

fewerlongdistancecallscanbemadesimultaneously.TheartofTrafficEngineeringistohave

enoughcapacitythatcallsarerarelyblocked,butnomoretha

nthatnumber.SeealsoChoke

ExchangeandBlocking.

CPC‐CallingPartyControlSometimesreferredtoas"CPCWink"or"disconnectsupervision".A

callsupervisionfeatureonananalogloopstartlinethatprovidestheabilityforaCO(Central

Office)tosignalthecalledpartywhenthecall

ingpartyhangsup.CPCallowsthePBX,key

system,ortelephoneansweringdevicetoresetthelinesothatitisreadytoacceptorinitiate

anothercall.CPCisaccomplishedbyeitheraloopcurrentdroporreversal.WithsomeCO

equipment,itisalsoprovidedifthecalledpartydropsthecall

.SeealsoMCLD.

CPE‐CustomerPremiseEquipmentCustomerownedequipmentlocatedathis/herfacility,such

asaCSUorterminal.IntheUSAandCanada,theNT1ispartoftheCPE.

CPN‐CalledPartyNumberEuropeanTerm.Thenumberthathasbeendialed.SeeCalledParty

Address.

CSD‐CircuitSw

itchedDataAdial‐updatacommunicationschannelwhich,onceestablished,

lookslikeatransparentdatapipe.Also,thetypeofISDNservicerequiredtoutilizethiscapability

ofanISDNcircuit.IncontrasttoCSV.

CSU‐ChannelServiceUnitTheNCTEusedintheUSA&Canadatotermina

teaT1line.Typically

theCSUmustbeprovidedbytheenduser.SeeNCTEandDSX1

CSU/DSUAdevicewhichincorporatesthefunctionsofaCSU(ChannelServiceUnit)andaDSU

(DataServiceUnit)MostcommonlyitinterfacesbetweenaSwitched‐56orDedicatedDigital

Servicecirc

uitandauser’sdataequipmentsuchastheZephyr.

CSVCircuitSwitchedVoice‐Adial‐upcommunicationscircuitforvoicegradecommunication.

Also,thetypeofISDNservicerequiredtousethiscapabilityofanISDNcircuit.IncontrasttoCSD

CustomISDN(USA&Canada)AnISDNprotocolwhichpre‐datesNationalISD

N‐1.Inmost

casesNationalISDN‐1isalsoavailable.TheNorthernTelecomDMS‐100switchSupports“DMS

CustomFunctional"ISDN.TheAT&T/Lucent5ESSswitchSupports“CustomPoint‐to‐Point”

(PTP)andCustomPoint‐to‐MultiPoint(PMP).TheISDNprotocolhasnorelationtowhereon

e

maycall.TelosequipmentdoesnotsupportPMP.

DChannel‐Data/DeltaChannelDependingonwhoyouask,itisDataorDelta.Thechannel

whichhandlesISDNnetwork‐relateddatabetweentheuser’sequipmentandtheTelcoswitch.

Usedtocarrydatatosetupcallsandreceivecalls.So

meTelco’salsoallowuserstousetheD

channeltoaccessthepacketdatanetwork,withappropriateterminalequipment.

D4SeeSuperframe.SeealsoLineFormat.

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