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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 3: GUIDED TOUR of the HARDWARE 25

ISDN Interface

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IMPORTANT!

As with any piece of modern electronic gear, it is advisable that precautions be taken to

prevent damage caused by power surges. Standard telephone line surge protectors can be used

to offer some degree of protection at the U interface jack. Special protectors are available for

the S interface.

It is the user’s responsibility to ensure that adequate protection is provided.

Section 5 has additional information.

UInterface(2wire)‐foruseintheUSAandCanada

TheISDNUinterfaceisforconnectionwith“raw”2B1QBRIISDNcircuitsasprovidedprimarilyin

theUSA&Canada.Whenthisjackisused,youwillbeusingZephyrXstream’sbuilt‐inNT1

(NetworkTerminator).Thisisa6‐positi

on/4‐pinminiaturemodularjackwiththefollowingpin

out.

PIN FUNCTION

1 No Connection

2 No Connection

3 Line (R)

4 Line (T)

5 No Connection

6 No Connection (Top)

ISDN U interface connector. Note, the polarity

of the line connections should not matter.

UInterfaceSyncLED

AgreenLED,locatedbelowtheUinterfacejack,showsthestatusofthebuilt‐inNT1.Normal

statusisindicatedbytheLEDbeinglit.Rapidflashing(aboutfivetimespersecond)indicatesa

lossoftheISDNatthelowest(physical)level.IftheNT1cancont

actthecentraloffice(oran

activeUrepeater),theLEDwillblinkslowly(aboutoncepersecond)astheSconnection

betweentheNT1andtherestoftheISDNinterfaceoccurs.TheLEDwillcomeonsolidlywhen

allhandshakingiscompletedandthebasiclineconnection(OSILayer1)isgood.Ifth

isLEDdoes

notlightcontinuouslyonceyouhaveconnectedyourISDNcircuit,youmaywishtoskipaheadto

Section13.4(DeepTechInformation‐Troubleshooting)forinformationontroubleshooting

problems.

U

U Sync LED

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