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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 7 – Ordering ISDN for Countries Using ETS300 (EURO ISDN) 328

CSD and CSV

RecallthateachISDNBRIhastwopossibleBchannels.Itispossibletoorderalinewithoneor

bothoftheBchannelsenabled–andeachmaybeusedforvoiceand/ordatause.Phone

terminologyfortheclassofserviceisCSVforCircuitSwitchedVoiceconnectionsandCSDfor

CircuitSwitch

edDataconnections.(IncontrasttoPSD,PacketSwitchedData,thisispossible,

butirrelevanttoourneeds.)

CSDisusedforcodecconnections.Eventhoughyoumaybesendingvoice,thecodec’soutput

willbeindataformandthereforemustbehandledtransparentlybythete

lephonenetwork.

ThishappensbecausetheZephyrXstreamindicatesthatthisisaCSDcall(overtheDchannel)

whenthecallissetup.

CSVisforinterworkingwithvoicetelephoneservice,andallowsISDNtointerworkwithanalog

phonelinesandphonesatthefarend.CSVisrequiredwhencom

municatingtoaZephyrXport

thatisonaPOTSline.

YouwillbeorderingoneormoreISDNBRI2B+DcircuitswithCSD(required)andCSVoneachB

channel.EuroISDNnormallyprovidesbothCSVandCSD.

NT1s

TheISDNstandardspecifiestworeferencepoints,the“U”andthe“S”interface

s.TheUisthe

single‐pair(2‐wire)barecopperfromtheTelcoCO.Adevicecalleda“NetworkTermination,

Type1”convertsthistothetwo‐pair(4‐wire)Sinterface.TheZephyrXstreamincludesabuilt‐in

NT1.ThisisforuseintheUSA&Canada.Youshouldnotconn

ecttotheUinterfaceinother

countrieswithoutfirstconsultingtheTelco.Theymayhaveregulationsagainstdoingso,and

theywillprobablyprovidepowerforremotepoweringanNT1,andthispowercoulddamage

yourZephyrXstream’sISDNinterface.

TheolderZephyrclassicunitssoldoutsidetheUSAmayonlyhaveanSin

terface.Ifyouplanon

takingthoseunitstoCanadaorNorthAmericayouwillneedtorentorpurchaseanexternalNT1

forusewhileinthosecountries.OnerentalsourceisSilverLake.Seetheirwebsiteat

www.silverlakeaudio.com

.

PP vs PMP

TheSinterfaceallowsformultipleterminalstobeconnectedsimultaneously.Thisiscalled

PointtoMulti‐Point(PMP)operation.Whenasingleterminalisusedthisisreferredtoasa

PointtoPointconfiguration(PP).

TheXstreamcanbeusedineitherenvironment.Ifyouintendtohaveotherte

rminalssharethe

SinterfacewiththeXstream,youshouldmakesureyourTelcoconfigurestheirswitchproperly

tosupportthis(PMP).Youwillalsoneedtofollowthecorrectterminationrulesifyouwillhave

multipleterminals.

Line Deactivation

TheEuroISDNstandardallowsISDNBRIlinestobedeactivatedbytheTel

ecomwhennotinuse.

Itisimpossibletodistinguishadeactivatedlinefromalinethatisdefectiveandoutofservice,

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