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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 331

Appendix 8: Ordering ISDN for the USA & Canada

ThissectionappliestousersinCanada&USAandisintendedtohelpyouwhenitcomestimeto

orderyourISDNlines.WeassumeyouhavereadthedescriptionofISDNinsection7(ISDN

Basics)andarefamiliarwithISDN’sbasicconcepts.Ifyouhavenotreadthatsection,doingso

nowwillhelpyoutobette

runderstandtheinformationthatfollows.

BecauseISDNintheUSAiscomplex,thereisoccasionallyconfusionaboutwhatitisandhowto

getit.Ifyouknowwhotocallandprovidethemwithcompleteinformation,theISDNordering

processcanbesimpleandstraightforward.Thisguid

etakesyouthroughtheprocessstep‐by‐

step.TelosTechnicalSupportisavailabletoansweranyfurtherquestionsyoumayhave.Don’t

take“no”forananswerifyourTelcodoesnotunderstandyourneeds.

OnoneISDNBRIcircuit,therearethreesimultaneousbi‐dire

ctionalchannels:two64kbps

“bearer”or“B”channelsforthetransmissionofuserinformationandone16kbps“data”or“D”

channelforcallset‐upandstatuscommunication.Thatiswhythisissometimescalled2B+D

service.YoucanusetheBchannels,butonlythephonecompaniesandequipment

manufacturerscanusuallyusetheDch

annel.ISDNcomesintoyourfacilityontwowires,just

likeplainoldtelephoneservice(POTS).

Fromtheperspectiveoftelephonenetworkrouting,eachchannelappearstobeaseparateline

withitsownnumberandindependentdial‐outcapabilities.Sinceeachhastobediale

dor

answeredseparately,theyappeartobe“lines”tousersalso.WerefertoaBchannelasa“line”

ontheZephyrXstream’smenu.

TheZephyrXstream’sinternalISDNinterface(sometimescalledbyitsgenericname“Terminal

Adapter”)isusedtoconnecttodigitalISDNtelephonecircuits.Iteasilyadaptstothevarious

typesofserviceofferedbytherangeofCentralOffice(CO

)switchesinstalledbytelephone

companiesintheUSAandCanada.

Ordering ISDN

Dealing with the Phone Company

Asisoftenthecasewhenbroadcastersinterfacewithphonepeople,thelinesofcommunication

onISDNcangetalittletangled.

Thefirstorderofbusinessistofindsomeonewhokn

owswhatISDNis.Whileyourusual

accountagentwillbethenormalentrypoint,youmightbetalkingtoseveralpeoplebeforeyou

findonewhounderstandsyourneeds.

SomeoftheregionalBellcompaniesofferasinglepointofcontactnu

mberforswitcheddigital

services,whilesomeTelcosuse“resellers”.Notethatinsomecasesthephonecompanywill

needtodoa“loopqualification”(linelosstest)beforetheycanverifythatISDNwillbeavailable

atyourlocation.

Herearesomecontactnumbersweuse–ifyouhaveparti

cularlypositiveornegative

experienceswiththeseoffices,pleaseletusknow.

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