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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 8 – Ordering ISDN for the USA and Canada 333

Details, Details

Inordertocommunicateaccuratelywhatitisyouneed,wethinkyoushouldbefamiliarwith

thevocabularyusedtodescribeISDN.Aswithanything,forbestresults,ithelpstoknowwhat

youaretalkingabout.Foranin‐depthglossaryofterminologypleasecheckAppendix10

(Glossary)orTelos’websiteathttp://www.telos‐systems.com

.

Protocols

Inaperfectworld,allISDNterminalequipmentwouldworkwithallISDNlines,withoutregard

forsucharcanaas5ESS,DMS100,CSV/CSD,SPIDs,etc.TheUSAISDN“standard”hadbeen

evolvingforseveralyears.Thegoodnewsisthatithasnowsettleddown,withmostnew

installationsusingNa

tionalISDN‐1orNationalISDN‐2(seebelow).

Attheircentraloffices,thetelephonecompaniesuseAT&T/LUCENT5ESS,NorthernTelecom

DMS100,orSiemensEWSDswitchingequipment.WhileeachwillworkwiththeZephyr

Xstream,therearesomedifferences,whichneedtobetakenintoaccountwhenlinesare

orderedandused.Ea

chhas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.

Therearestandardprotocolsthatallswitchesmayprovide,calledNationalISDN‐1(NI‐1)and

NationalISDN‐2(NI‐2)

.TheseprotocolswerestandardizedandspecifiedbyBellcore,the

technicallabjointlyownedbythephonecompanies.However,bothAT&TandNorthern

TelecomhadversionsofISDNwhichpredatedtheNI‐1standardandafewswitchesmaynot

beenupgradedtothenewformat.Inthatcaseyouwouldneedtouseoneoftheolder

"custo

m"protocols.

ThereisalsoanewerNI‐2standard,butitisdesignedtobecompatiblewithNI‐1forallofthe

basicfunctionsandthereforeisacceptabletodevicesuchastheZephyrthatuseNI‐1.

SPIDs

ServiceProfileIdentification(SP

ID)numbersarerequiredinallbutoneoftheAT&Tprotocols.

Thesenumbersaregiventotheuserbythephonecompanyandmustbeenteredcorrectlyinto

theZephyrXstreaminorderfortheconnectiontofunction.SPIDsusuallyconsistofthephone

numberplusafewprefixorsuffixdigits(itmayormaynoti

ncludetheareacode).Thereis

frequentconfusionbetweenphonenumbersandSPIDs,evenamongTelcopersonnel.While

theSPIDfrequentlyincludesthecorrespondingphonenumber,thisisnotnecessarilythecase.

TheintentionoftheSPIDistoallowtheTelcoequipmenttoauto

maticallyadapttovarioususer

requirements,bysensingdifferentSPIDsfromeachtypeorconfigurationofuserterminal.

Noneofthismatterswithourapplication,butwemustentertheSPIDsnevertheless.BellSouth

hasproposed,andmostoftheothertelephonecompanieshaveagreedtoimplement,a

standardizedSPIDfornewinstallations.Thishasbee

nimplementedbymostTelcos.The

standardisareacode+phonenumber+0101(XXXYYYZZZZ0101).SeeAppendix4foralistofSPID

formatsusedbytheTelcospriortothestandard.

UnlessyouareusingtheAT&TPTPprotocol,yourTelcoservicerepresentativeshouldgiveyou

oneSPIDforeachBc

hannelyouorder.Don’tletthephonecompanyinstallerleavewithout

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