ITU-T J.285 (12 2007) (英) Architecture for synchronised programme……

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1、InternationalTelecommunicationUnionITU-TJ.285TELECOMMUNICATION(12/2007)STANDARDIZATIONSECTOROFITUSERIESJ:CABLENETWORKSANDTRANSMISSIONOFTELEVISION,SOUNDPROGRAMMEANDOTHERMULTIMEDIASIGNALSDigitaltransmissionoftelevisionsignalsArchitectureforsynchronisedprogrammetransferwithpu

2、lloperationoverIP-basednetworksITU-TRecommendationJ.285ITU-TRecommendationJ.285ArchitectureforsynchronisedprogrammetransferwithpulloperationoverIP-basednetworksSummaryITU-TRecommendationJ.285definesrequirementsofIP-basedmaterialtransferfromremotesitestoabroadcaststationcon

3、trolledbythebroadcaststationside.TherequirementsarebasedonthegenericrequirementsdefinedinITU-TRecommendationJ.284withtheanalysisofseveralusecaseswhicharealsodescribedinthisRecommendation.Tosatisfytherequirements,thisRecommendationalsodefinesthearchitectureforprogrammemater

4、ialtransferinsynchronizationwithpulloperation.Thearchitectureisonlyrelevanttotransferoffile-basedmaterialssuchascomputerfiles.Thatis,transferofunfiledmaterialssuchassignalsfromequipmentlikecamerasandmicrophonesarenottakenintoaccountinthisRecommendation.Thearchitecturealsoe

5、nablessynchronizedtransferofmultiplefilessimultaneously,whichofferstheopportunityforthereceivertoswitchreceivingfilesfromonetotheothersaccordingtoaneditdecisionlist(EDL).SourceITU-TRecommendationJ.285wasapprovedon14December2007byITU-TStudyGroup9(2005-2008)undertheITU-TReco

6、mmendationA.8procedure.ITU-TRec.J.285(12/2007)iFOREWORDTheInternationalTelecommunicationUnion(ITU)istheUnitedNationsspecializedagencyinthefieldoftelecommunications,informationandcommunicationtechnologies(ICTs).TheITUTelecommunicationStandardizationSector(ITU-T)isapermanent

7、organofITU.ITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationAssembly(WTSA),whichmeetseveryfouryears,establishesthetopicsforst

8、udybytheITU-Tstudygroupswhich,inturn,produceRecommendationsonthesetopics.TheapprovalofITU