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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 334

providingyouwiththephonenumbersofyourBchannels(oftencalled"DirectoryNumbers",or

"DNs")andyourSPIDs!

Directory Number (DN)

Thesearesimplyyoursevendigitphonenumbers,aswouldbelistedinyourlocaltelephone

directory,andneedtobeenteredintoyourZephyrXstream.NormallyeachISDNBRIcircuitwill

havetwoDNsandtwoSPIDs.Ea

chDNcorrespondstoagivenSPIDandwhenyouenterthis

information,youmustenterthemtoreflectthisrelationship.

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chann

elsenabled–andeachmaybeenabledforvoiceand/ordatause.Phone

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

SwitchedData.(IncontrasttoPSD,PacketSwitchedData,whichispossiblebutirrelevanttoour

needs.)

CSVisnotrequiredforTel

osZephyrXstreamhi‐fidelityaudioconnections.Eventhoughyou

maybesendingvoice,thecodec’soutputwillbeinadataformandmustbehandled

transparentlybythetelephonenetwork.ThishappensbecausetheZephyrXstreamindicates

thatthisisaCSDcall(overtheDchann

el)whenthecallissetup.

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

phonelinesandphones.CSVisrequiredtoplacecallstoaZephyrXportthatisusingaPOTS

line.

YouwillbeorderingoneormoreISDNBR

I2B+DcircuitswithCSD(required)andCSV(optional)

oneachBchannel.AlternateCSD/CSVshouldberequested.

NT1s

TheISDNstandardspecifiestworeferencepoints,the“U”(2‐wire)andthe“S”(4‐wire)

interfaces.TheUisthesingle‐pairbarecopperfromtheTelcoCO.Adevicecalleda“Network

Termina

tion,Type1”convertsthistothetwo‐pairSinterface.

InEurope,Asia,SouthAmerica,andmostoftheworld,theNT1isalwaysprovidedbythephone

company.TheZephyrXstreamprovidesboththeUinterface(onan6‐position4‐pinminiature

“RJ‐11style”modularcon

nector)andtheSinterface(onan8‐position8‐pinminiature“RJ‐45

style”modularconnector).

Terminals and Terminal Types

AnyequipmentconnectedtoanISDNlineisa‘terminal’–whetherphone,computer,orcodec.

“Point‐to‐point”linessupportoneterminal,while“multipoint”linescanhaveuptoeightin

someappli

cations.

“TerminalType”isaparametersometimesrequestedbythephonepeople.Theappropriate

valuefortheZephyrXstreamvariesdependinguponprotocolandisincludedontheorder

forms.

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