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页数:18页
时间:2019-10-18
《ITU-T J.285 (12 2007) (英) Architecture for synchronised programme……》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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
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