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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 7: ISDN BASICS 137

Z

ZEPHYR CLASSIC VS XSTREAM COMPARISON!

Most versions of the Zephyr Classic can operate without Directory Numbers. Zephyr Xstream

requires the DNs be present to receive incoming calls.

MultipleSubscriberNumbers(MSNs)

MSNsperformthesamefunctionwhentheISDNprotocolusedisETS300(EuroISDN)orINS64

(JapaneseISDN).Inthiscase,useoftheMSNisentirelyoptional.IfnoMSNsareentered,the

firstcalltoanyofthenumbersassociatedtotheISDNcir

cuitwillringinas“line1”ifthat“line”

isidle.If“line1”isinusethecallwillringinon“line2”.Thisispreciselythesamebehavioras

whenalinewiththe“AT&TCustomPTP”protocolisused.

Long-Distance Digital Connectivity

Long‐distanceconnectivityisroutinelyavailableinmostpartsoftheUSAfro

mcarrierssuchas

AT&T,Sprint,andVerizon.Connectivitybetweenanytwogivenpointsissomewhatvariable.

The“dial1+”defaultcarriermaybechosenatthetimeyouordertheline,justaswith

traditionalvoicelines.Also,justaswithvoicelines,youmaycho

oseacarrieronaper‐callbasis

byprefixingthenumberwiththe1010XXXcarrierselectioncode.

Youmustdialthefullnumber,includingthe1or011+countrycodefollowingtheprefix.

Somelong‐distanceconnectionsarelimitedto56kbps/channel.Thislimitationisbecoming

morerare.Th

ereisnocertainwaytoknowinadvance.Occasionally,someconnectionsmay

workat64Kbpsandnot56Kbps.Therefore,youmayneedtotryboth.

TheZephyrXstreamprovidesstandardrateadaptation(officiallyknownas‘CCITTV.110’)from

56to64kbpsandviceversawhenrequired.Bitrateadaptationh

appensautomaticallywithin

theZephyrXstreamdependingupontherateselectedbythecallingparty.SincetheZephyr

Xstreamcannotcommunicateatbothratessimultaneously,itwillignorerateadaptation

informationonthesecondincomingcallremainingattheratesetforthepriorcall.

Inourexperience,theonlysurewaytoknowifaconnectiongive

nbetweentoparticularpoints

willworkistotryit,firstat64kbpsandthenat56kbpsifthehigherratefails.

i

ISDN TIP!

Not all carriers can handle “Circuit Switched Data” (CSD) connections at all. This type of

connection is what makes real-time low-delay audio transmission possible, and is required.

For the latest information, check Appendix 10 (Ordering ISDN in the USA & Canada).

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