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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 7: ISDN BASICS 140

Zephyr Xstream ISDN Compatibility

Protocols

TheTelconetworkandtheZephyrXstreamcommunicateviaa‘protocol’–thelanguagethe

userequipmentandthetelephonenetworkusetoconverse(ontheDchannel)forsettingup

callsandthelike.Thisiswheretherearedifferencesdependinguponthecentraloffice

equipmentusedonthelineandthesta

ndardswhicharesupportedbythatparticular

equipment.WhileeachtypewillworkwiththeZephyrXstream,thedifferencesneedtobe

takenintoaccountwhenlinesareorderedandtheZephyrXstreamsetup.

IntheUSA,telephonecompaniesuseeitherAT&T/Lucent5ESS,NorthernTelecom/NortelDMS‐

100,orSieme

nsEWSDswitches.EachofthesecansupporttheNationalISDN1(NI‐1)protocol

standard,whichhasbeenspecifiedbyBellcore,thetechnicallabthatwasjointlyownedbythe

phonecompanies.However,bothAT&TandNorthernTelecomhad“custom”versionsofISDN

whichpre‐datetheNI‐1s

tandardandafewswitcheshavenotbeenupgradedtothenewerNI‐1

standard.

t

CURIOSITY NOTE!

There is also a newer National ISDN-2 (NI-2) standard, but it designed to be compatible with

NI-1 for all of the basic functions.

InEurope(aswellasmuchoftherestoftheworld),thecommonstandardisEuro‐ISDN,

followingtheETS300standards.Itisan(apparentlysuccessful!)attemptforalloftheEuropean

telephonenetworkstouseasingle,compatibleprotocol.

InJapan,theprotocolusediscalledINS64.

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