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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 10 – Glossary 347

CallingLineIDSeeCLID.SeealsoCallerID.

CallingPartyControlSeeCPC.

CASChannelAssociatedSignaling.Abit‐basedsignalingmethodusedondigitallines(suchas

T1)thatisperiodicallyinsertedintotheloworderbitalsousedfortheaudiotransmission.See

RobbedBitSignaling.

CauseCodeAcodereturnedbyswitchingequi

pmenttoISDNequipmentaspartofthecall

controlsignalingprotocol.Thecausecodeindicatesthatanetworkcall‐relatedeventhas

occurredorhasfailed.Sincethesecodesactuallycomefromthenetwork,thefactyouare

gettingacausecodeisanindica

tionthatthattheISDNcircuitisoperationalatsomelevel.

CCISCommonChannelInterofficeSignaling.Asignalingsystemwherenetworkinformation

suchasaddressandroutinginformationarehandledexternallytotheactualcommunications

(voice)path.SS7(SignalingSystem7)istheinternationallystandardizedCCISsystem.

DeploymentofCCISincreasedeffici

encysincenocommunications(voice)channelsareused

merelytoreportan“alltrunksbusy”or“farendbusy”conditions.Italsodecreasedtollfraud

substantiallysinceitremovedthepotentialforaccesstothesignalinginformationthatwas

inherenttoin‐bandsignalingschemes.CCISalsoenablesCLASSfeaturesaswellassophisticated

re‐routingfeaturesfor“intellige

ntnetwork”applications.Seealsoin‐bandsignaling.Seealso

SS7.

CentralOfficeSeeCO

Centrex‐CentralExchangeService.Anenhancedbusinesstelephoneserviceintendedtooffer

mostofthefeaturesofaPBXbutwherethelinesareallfromtheLE

Coutofapublicswitch.

OffersCLASS‐likefeaturesforbusinessuserssuchas4‐digit"inside"dialing,hold,transfer,

attendant,etc.

CEPT‐ConferenceonEuropeanPosts&Telecommunications.ThisisaEuropeanstandards

bodythatformerlysetthestandardsfortelephoneinterfacesfor26countries.

CEPTFormatTheusualra

teandframeformatforE1circuits.2.048mbps.SeeE1.

CEPTRateSeeCEPTformat.SeealsoE1.

ChannelAnactualpathyoucantalkorsenddataover.Thisiswhatyouarepayingthephone

companyfor.Forinstance,ISDNBRIlinescanbeorderedwith1or2activecha

nnelsandthese

channelscanbeconfiguredforvoicecalls(CSV),datacalls(CSD)orboth(alternateCSD/CSV).A

channeldoesnotnecessarilyhaveit’sownuniquetelephonenumber.SeeISDN.

ChannelAssociatedSignalingSeeCAS.SeealsoRobbedBitSignaling.

ChokeExchangeAtelephoneexchange,whichisas

signedtoRadioandTVstations,Promoters,

andotherusersthatwillbereceivinglargenumbersofsimultaneouscalls.Theideaistogroup

alloftheseusersonasingleexchangesowhenallroutesintothatexchangeareinuse“normal”

users(onotherexchanges)willnotexperienceblo

ckingofincomingoroutgoingcalls.Trunks

fromotherlocalexchangesintothechokeexchangearedeliberatelylimitedtojustafewpaths

socallerswillgetan"alltrunksbusy"insteadofcompletelyblockingtheirlocalexchange.

However,whenoneofthechokeexchangeusersexperiencesalargenumberofcalls(aswhen

yourstationr

unsacontest)theotherchokeexchangeuserswillbeblockedbecausealltrunks

intothechokeexchangewillbebusy.Inthemodernnetwork,usingCCISsignalingsuchasSS7,

actualtrunksarenotusedtoconvey"busy"or"alltrunksbusy"conditions.Thusblocki

ngdueto

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