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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 8: LIVEWIRE

TM

– IP Audio 149

801.1ptagging,802.1pVLANID,802.1qPriority,&DSCPClassofService

802.1ptaggingisnecessarywithintheLivewirenetworktomarkhigh‐priorityaudiopackets.

ThisinformationisusedbytheEthernetswitchesinthepacketschedulingandqueuing

mechanism.Itprovideslow‐jitterpacketforwardingofLivewireclockandlow‐latencyaudio

streams.

Ontheotherhand,Standardstreamsdon’tneedtag

ging,becausetheyarenotlow‐latency.By

default,standardstreamsaremarkedwithTypeofService(DSCPcodepoints)informationin

theIPheaderwhichcanbeusedbyL3switchestoprovidebetterservicetoouraudiostreams

thantobesteffortIPtraffic.

ThereisanoptiontoenableL2802.1ptaggingonsta

ndardstreams,andthismaybeusedwith

switcheswhichdonotusetheDSCPinformationincludedintheTOSfieldoftheIPheader.We

donotenablethis

taggingbydefault,becauseitwouldn’tworkincross‐overEthernet

connectiontoPCs;mostnetworkcardsdonotaccept802.1pframesbydefault.

Youshouldnotneedtochangethesedefaultsettingsunlessyouarebuildingasystemwhichis

notbasedonourrecommendations.

InAxianodesandtheXstr

eam,theVLANIDsettingisaread‐onlyvalue.Itisalways0and

cannotbechanged.AsaresultLivewireaudioalwaysusesthenativeVLANassignedtotheport

oftheswitch.

“DSCPClassofService”isastandarddescribingthetaggingofIPframeswithservice

information.Networkequi

pmentcanbesetuptoprovidedifferentforwardingdelayanddrop

precedencedependingontheserviceinformation.Ourdefaultsarecompatiblewithmost

EthernetequipmentdefaultsforclassofserviceLivewirerequires;youshouldnotneedto

changethemunlessinstructedbyAxiaSupport.



8.2 Livewire Audio Settings



TherearetwowaystosetupLivewireaudio,BasicMode(shownbydefault)andExpertMode.

ThedifferencebetweenthesetwomodesisthatExpertModeallowsyoutocustomizethe

codecbackfeeds.Wewilltakealookatbothscenarios.



LivewireConfiguration–BasicMode

Thismodewillbefullya

dequateformostusers.Itassumesthedefaultbackfeedforthecodec.

Thisistheautomaticmix‐minuscreatedbythemixengineandwillconsistofthePGMorAUX

busasconfiguredonyourElementorothercontrolsurface.



Inthisexample,thesourcesbeingdeliveredtotheLivewirene

tworkhavebeenidentifiedasZXS

SRC1andZXSSRC2.Thesearesimplynametagsandtheycanbevirtuallyanythingyouwant.

Wesuggestyoumakethemdescriptiveanduniquesoyouwillbeabletoeasilydeterminethe

sourceifyouhavemultipleXstreamcodecsinyourfa

cility.



Thechannelnumbersthatyouspecifymustbecarefullychosen.Theymustbeuniquesince

duplicatechannelnumbersinaLivewirenetworkwillresultinmulticastcollisionsand“lessthan

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