USER’S MANUAL
Section 6: AUDIO CODING REFERENCE 131
alsousefulfornetworkoperationscenters,orotherbusyfacilities,where
theequipmentmustbestretchedasfaraspossible.
Connectivity
TheXstream'sMPEGbitstreamsfollowstandardISOformat,andmaybeusedtocommunicate
withanycodecthatsupportsthisstandard.InmodesthatrequiretwoISDNchannels,the
chann
el‐splitting(IMUX)methodbecomesanissue.
Layer2iswidelysupportedbymanymanufacturers.TheZephyrXstreamsupportstheCDQ
splittingscheme,soitmaybeusedtocommunicatewiththecodecsfromavarietyofvendors
thatsupportthismode.
InLayer‐3Zephyrsetthestandard.Othercode
csthatsupportLayer‐3usetheFhG/Telos
protocoldevelopedforZephyrclassic(Buchtasplitting).
Teloshaslongbeenaproponentofinternationalstandardsforcodecinteroperability.The
specificationsofourIMUXsystem,developedforAACandAAC‐LD,isavailablewithoutroyalty,
andispublishedonourwebsiteforreferencebyothermanufa
cturers.
TheXstream’sG.722modeoffersconnectivitywithalmostallcodecsthatusethiscoding
method,andwhichdonotusetherareH.221framingscheme.Wesupportthemorecommon
"SRT"(StatisticalRecoveryTiming)method.
Ancillarydatatransmissionisnotstandardizedandisthereforenotavailablebe
tweencodecs
madebydifferentmanufacturers.