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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 279

• ISDN

Thisoptioncausestwodifferentthingstohappen.

a) DatacomingintheISDNinterface(whenINTERFACEissettoISDN)

issentbackoutthesamechannel(s)oftheinterface.Therefore,the

unitontheotherendshouldbeabletoreceiveitsownaudioback

(assumingitisconfigure

dforcompatibleTransmitandReceive

modes).Ifthisisthecase,thenetworkpathisfunctioning.

b) Codecdatafromtheencoderispassedbacktothedecoder(when

INTERFACEissettoISDN).Therefore,youshouldreceiveyourown

audioback(assumingitisconfiguredforcompa

tibleTransmitand

Receivemodes)withdelayandqualitydependantonthecoding

modeused.Thistestsover70%oftheXstream'sfunctionality.

Thismodecanbeusedtoauditionthevariouscodingmodesevenwhenno

ISDNcircuitispresent.

A

U

D

I

O

DECODER

OFF

ON

OFF

ON

ENCODER

clk

TxD

RxD

RxC

TxC

clk

data

data

audio

audio

Xstream

SEND

RCV

OFF

ON

OFF

ON

ISDN

Interface

AUDIO LOOPBACK

SWITCHES

IONIOFF

ISDN LOOPBACK

SWITCHES

TheAUDIOandISDNloopbackmodesareillustratedabove.The

switchesontheleftsideareactivatedfortheAUDIOLOOPBACK

modewhiletheswitchesontherightareactivatedfortheISDN

LOOPBACKmode.



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