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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 13: Deep Tech Information and Troubleshooting 280

13.6.3 Audio Difficulties

Condition: ISDN Connecting OK, But No Audio

WhatisthestateoftheLOCKLEDs?

ChecktheLOCKLED.OnmeansOK,connectedandreceivingvaliddata.Ifnot

illuminated,trycyclingthroughreceivemodestoseeifyoucan“find”themodeatthe

otherend.

Whathappenswhenyoucallyourself?

Trycallingyourself,fromoneISD

Nlinetotheother(assumingyouhavebothavailable).

Usea56kbpsratefirst,asthisisthemostuniversal.SetRcvmodetoL3StereoandXmt

toL3DualorL3Stereo)Audioshouldworkinbothdirections.Thisconfirmsthatthe

ZephyrisOK,andthattheproblemli

essomewheredownstream,probablyintheTelco’s

connectionfacilitieseitherbetweenitsowncentralofficeswitchingequipmentortothe

long‐distancecarrieryouaretryingtouse.

Whathappenstoyourlo calaudiowhenyoutryanISDNloopback?

Ifsuccessful,thiseliminatesover70%oftheXstreamcircui

tryastheculprit.Remaining

suspectswouldbeprimarilytheISDNcard,ortheV.35card(ifrelevanttoyour

problem).Remember,XmtandRcvmodesmustbecompatible.

Arethecodingmodessetproperly?

TheXmt(transmit)andRcv(receive)modesandthebitratemustbesetinconj

unction

withthoseoftheunitattheotherend.TheBitRateandSampleRatesettingmustalso

match.

Whathappensifyoutryadifferentlongdistancecarrierforthecall?

Whathappensifyoutrythecallat56vs64(orviceversa)?

Whathappensifyo

utryreversingthedirectionofthecall?

Whathappensifyoutryplacingalocalcallasalongdistancecall?

Sincemostofthenetworkusesseparatetransmitandreceivepaths,itisentirely

possibletohaveapathinonedirectionbutnottheother.Theabovetestsma

yforce

youthroughthenetworkviaadifferentpath.

Iflocalcallsareok,butlongdistancecallsfailwithallthreemajorlongdistancecarriers,

thenitislikelythereisatrunkproblembetweenyourlocalCOandthetandemswitch.

Condition: No Audio In Both Directions

DoestheZephyrXstream’sloopbackisol

atetheproblem?

Seeabovefortipsonusingtheloopbackmodes.

Ontheotherhand,ifyoucan’treceivedistantaudio,butgetadelayedversionofyour

owntransmittedsignal,it’spossiblethatoneoftheXstreamswasleftintheloopback

mode.We’vealsorunacrosssituationswereapie

ceoftheTelco’snetworkgearwas

leftinloopbackmode.

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