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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 10 – Glossary 348

astationcontestshouldnotoccurasthebusystatusinresponsetoacallattemptisconveyed

overtheseparateSS7network.Therefore,theneedforchokeexchangeshasprettymuch

disappeared.Nonetheless,manyTelcosstillinsistthatBroadcastersusespecialchokelinesfor

call‐inlines.Seeblockingandcon

centration.

CircuitAphysicalpaththroughwhichelectricalsignalscanpass.Itconsistsofanetworkof

conductorsandothercomponents,separatedbyinsulators.Technicallythistermcannotbe

appliedtofiberopticorother“non‐metallic”paths.Seealsochannel.

CircuitSwitchedDataSeeCSD

CircuitSwitchingAsystemwhereade

dicatedchannelisallocatedtotheusersofthatcallfor

thedurationofthatcall.Thatchannelisallocatedforthedurationofthecallregardlessif

informationisbeingtransmittedatanygivenmoment.Bandwidththroughthechannelisfixed,

atnotimemaythisbandwidthbeexceeded.Ifthisbandwid

thisnotuseditiswasted.While

inherentlyinefficient,thedependableandreliablenatureofcircuitswitchingmakesitideally

suitedtoreal‐timevoiceandaudio/videoconferencingapplications.WhenoverloadedCircuit

Switchednetworkswillrespond"allcircuitsarebusy…tryagainlater".Thisisinstarkcontrast

packe

tswitchednetworksortosystemswherestatisticalmultiplexingisused.Seestatistical

multiplexingandPacketSwitching.

CLASS‐CustomLocalAreaSignalingServices.Avarietyofenhancedfeatures(usuallyonanalog

lines)thattakeadvantageoftheabilityofmodernSS7technology’sabilitytotransmit

informationaboutthecalli

ngparty.CLASSincludessuchfeaturesasCallerID,Automatic

Callback,CallTrace(initiatedbysubscriber),SelectiveCallScreening,etc.

ClearCauseSeeCauseCode

CLEC‐CompetitiveLocalExchangeCarrierYourlocaltelephoneserviceproviderwhoisoneof

thenew‐generationprovidersratherthanaRBOCorIndependent.ACLECisr

eallyjustan

independent,albeitoneformedafterthedivestitureofAT&T.SeeLECandIndependent.

CLI‐CallingLineIdentityEuropeantermforCLID.SeeCLID.

CLID‐CallingLineIdentificationThisistheISDNandSS7equivalentofCallerID;I.E.thenumber

ofthecallingparty.SeealsoCallerIDandANI.

CO‐CentralOfficeTh

eTelcofacilitytowhichyourlocaltelephonecircuitlead.Contains

“Switches”and“Trunks”aswellasthelocaltelephonecircuits.

Codec‐COder/DECoderAdevicewhichtakesdigitizedaudioand“codes”itinordertoreduce

thetransmissionbitrateandwhichcanalsosimultaneously“deco

de”suchcodedaudio.Strictly

speaking,acodecdoesnotincludeanISDNterminaladapterandrelatedequipment.Simple

codecsarealsousedindigitaltelephony.Theseuseasimplecompandingschemetoreduce

channelnoise.

COL‐COnnectedLinenumberEuropeanTerm.Thenumbertowhichyouhaveconnected.This

maynotbethenu

mberyoudialedifcallforwardingisused.

CombinationTrunkAtrunk(channel)whichcanbothmakeandreceivecalls.Thisgenerally

referstoanaloggroundstartorloopstarttrunks,althoughthetermcanbeappliedtoISDNBRI

orPRIchannelsaswell.Ea

chcombinationtrunknormallyhasatelephonenumber,although

theyarefrequentlypartofahuntgroupandonlyonenumbermaybepublishedforthatgroup.

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