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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 290

Condition: Able to connect and lock to a distant site using IP, but audio dropouts

occur frequently

DolocalLANconnectionsworkok(orwithagreatlyreducednumberofdropouts?

Increasingthebuffersettingmayhelp.AlsonotethattheXstreamhaserror

concealmenttechnologywhenusingAAC,sowerecommendusingthatprotocolforthis

reason.

TryincreasingthebuffersizeintheCODECmenu

WhatQOS(Q

ualityofService)mechanismisinplaceontheIPpathbetweenthetwosites?

SuchQOScontroliscurrentlyimpossibleifthepathincludesthepublicInternet.QOS

optionsonaprivatenetworkarelimited.IfnootherequipmentissharingtheIPlink,

thenQOSisanon‐issue.Assoonasotherequi

pmentsharesthelink,ithastheabilityto

useallbandwidthattimesitneedsit(whendownloadingortransferringafile,for

example).

YournetworkequipmentandIPlinkserviceprovidermaybeabletoassistwith

strategies.AqualifiedInformationTechnologistwillbeinvalua

ble.

Onecrudestrategy,whenonlyafewdeviceswillsharethelink,istousetheEthernet

porttolimitbandwidth.Forexample,ifyourprimarypoint‐to‐pointlinkisat100Mbps

(megabitspersecond),anditisfedfromasingleEthernethubusinganEt

hernet100

Base‐T(100megabit)hubyoucouldconnectalimitednumberof10Base‐T(10megabit)

devices.Inthiscaseyoushouldbeabletouseeighttonine10Base‐Tdevices.These

devicesmustnotuse100Base‐Tortheycanswampthe100mega

bitconnection.

Thesamesetupcouldbeusedwithsmallernumberof10Base‐Tconnectionsifthelink

wereatalowerrate(i.e.youcouldconnectthree10Base‐Tdevicesifthelinkwere50

Mbps).

Unfortunately,theusualcaseisthatthepoint‐to‐pointlinkisataratemu

chlowerthan

10mbps‐often,2.048or1.544kbps(kilobitspersecond)orless.Inthiscase,the

simplestrategyabovecannotbeused.

AnotherproblemwithIPdeliveryis"packetloss".MostIPprovidersdonotguaranteea

specificdegreeofpacketloss.Noteth

attherearesomeexceptions.Inparticular,

MPLS‐basedservicesoftenprovidemorethanone“classofservice”orprioritylevel

whichcanallowthesystemdesignertoprotectbandwidthforcriticaloperationssuchas

codecs.

Whatisthe"packetloss"oftheIPpath?

Doestheproblemdisappearifotherdevicesarere

movedfromtheIPnetwork(i.e.doesitworkif

theIPnetworkisnotsharedoneitherend)?

Condition: Unable to connect in IP streaming modes.

YourfirewallandroutermaynotbepermittingtheIPstreamstopasstotheXstream.Youmay

needtouseportforwardingtopasstheaudiopacketstoth

eXstream.Attheminimumyou

mustopentheUDPport(defaultis9150).

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