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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 6: AUDIO CODING REFERENCE 131

alsousefulfornetworkoperationscenters,orotherbusyfacilities,where

theequipmentmustbestretchedasfaraspossible.

Connectivity

TheXstream'sMPEGbitstreamsfollowstandardISOformat,andmaybeusedtocommunicate

withanycodecthatsupportsthisstandard.InmodesthatrequiretwoISDNchannels,the

chann

el‐splitting(IMUX)methodbecomesanissue.

Layer2iswidelysupportedbymanymanufacturers.TheZephyrXstreamsupportstheCDQ

splittingscheme,soitmaybeusedtocommunicatewiththecodecsfromavarietyofvendors

thatsupportthismode.

InLayer‐3Zephyrsetthestandard.Othercode

csthatsupportLayer‐3usetheFhG/Telos

protocoldevelopedforZephyrclassic(Buchtasplitting).

Teloshaslongbeenaproponentofinternationalstandardsforcodecinteroperability.The

specificationsofourIMUXsystem,developedforAACandAAC‐LD,isavailablewithoutroyalty,

andispublishedonourwebsiteforreferencebyothermanufa

cturers.

TheXstream’sG.722modeoffersconnectivitywithalmostallcodecsthatusethiscoding

method,andwhichdonotusetherareH.221framingscheme.Wesupportthemorecommon

"SRT"(StatisticalRecoveryTiming)method.

Ancillarydatatransmissionisnotstandardizedandisthereforenotavailablebe

tweencodecs

madebydifferentmanufacturers.





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