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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 9: The V.35/X.21 Interface Option 155

Adtran

901ExplorerAve

Huntsville,AL35806

800‐827‐0807

www.adtran.com





Adtranmakesallsortofequipmentforthetelecomindustry.TheTelcosbuyequipmentfrom

Adtran.Reputablecompany.MostUSATelosDealerscarryAdtranequipment.

AnappropriateCSU/DSU(ChannelServiceUnit/DataServiceUnit)isrequiredtointerconnect

thelinewiththeZephyrXstream.DialingisperformedusingtheCSU/DSUdire

ctly.Popular

modelsaretheAdtranDSUIIIS4W(for4wirecircuits,Adtranpart#1202013L1)andDSUIII

S2W(for2wirecircuits,Adtranpart#1200015L2)seewww.adtran.com

oryourAdtrandealer.

AdtranalsomakesCSU/DSU'sforusewithdedicated56or64kbpscircuits.Seebelow.

IfthelocationwithSwitched56isonlytobeusedtemporarily,youmightwishtorentthe

CSU/DSUratherthanpurchaseone.Onerentalsourceis:

SilverLakeAudio

90SouthLongBeachRd

RockvilleCentre,NY11570

516‐763‐177

6

www.silverlakeaudio.com





Inmostareas,switched56andISDNare“inter‐worked”withintheCentralOfficeswitches,so

thatsubscribersofbothservicescanconnecttoeachother(ata56kbpsrate,ofcourse).

Therefore,thefarendunitmaybeonISDNorSwitched56.

IftwoSwitched56circuitsareavailable(aswellastwoCSU/DSU's)StereoorMo

no128

operationispossible.

T1 Circuits

Thispermitssubscriberaccesstoupto24channelsof64kbpseach.T1circuitsintothedialup

networkarefrequentlyusedwithprivatetelephonesystems(i.e.PBXs).However,dedicatedT1

servicebetweentwolocationsisavailable.Th

isoptionhasbecomeincreasinglypopularfor

STLs.

T1requiresaspecialMultiplexerorDSU(availablefromAdtranandothers)tobreakoutthe

individualchannels.Theseareusuallymodular,permittingeachchannel(timeslot)tobeused

individuallyasdesired.

EachZephyrXstreamwouldrequire1or2channelsforbi‐dire

ctionalmonoandstereo,

respectively,iftheV.35splitmodewereused.Inthatcase,eachchannelwouldbebrokenout

bythemultiplexerintoaseparateV.35/X.21port.

Orasingle112,128,256,0r384kbpsconnectioncanbeused,iftheXstreamV.35singleis

selectedfortheIn

terfaceintheTELmenu.SeeAppendix6(SpecialOperationalModes)for

moreonV.35Singleoperation.

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