ITU-T H.242 Amendment 1 (09 2005) (英) System for e

InternationalTelecommunicationUnionITU-TH.242TELECOMMUNICATIONSTANDARDIZATIONSECTOROFITUAmendment1(09/2005)SERIESH:AUDIOVISUALANDMULTIMEDIASYSTEMSInfrastructureofaudiovisualservices–CommunicationproceduresSystemforestablishingcommunicationbetweenaudiovisualterminalsusingdigitalchannelsupto2Mbit/sAmendment1:Supportfor14kHzaudiobandwidthextensionofG.722.1AnnexCinH.242ITU-TRecommendationH.242(2004)–Amendment1ITU-TH-SERIESRECOMMENDATIONSAUDIOVISUALANDMULTIMEDIASYSTEMSCHARACTERISTICSOFVISUALTELEPHONESYSTEMSH.100–H.199INFRASTRUCTUREOFAUDIOVISUALSERVICESGeneralH.200–H.219TransmissionmultiplexingandsynchronizationH.220–H.229SystemsaspectsH.230–H.239CommunicationproceduresH.240–H.259CodingofmovingvideoH.260–H.279RelatedsystemsaspectsH.280–H.299SystemsandterminalequipmentforaudiovisualservicesH.300–H.349DirectoryservicesarchitectureforaudiovisualandmultimediaservicesH.350–H.359QualityofservicearchitectureforaudiovisualandmultimediaservicesH.360–H.369SupplementaryservicesformultimediaH.450–H.499MOBILITYANDCOLLABORATIONPROCEDURESOverviewofMobilityandCollaboration,definitions,protocolsandproceduresH.500–H.509MobilityforH-SeriesmultimediasystemsandservicesH.510–H.519MobilemultimediacollaborationapplicationsandservicesH.520–H.529SecurityformobilemultimediasystemsandservicesH.530–H.539SecurityformobilemultimediacollaborationapplicationsandservicesH.540–H.549MobilityinterworkingproceduresH.550–H.559Mobilemultimediacollaborationinter-workingproceduresH.560–H.569BROADBANDANDTRIPLE-PLAYMULTIMEDIASERVICESBroadbandmultimediaservicesoverVDSLH.610–H.619Forfurtherdetails,pleaserefertothelistofITU-TRecommendations.ITU-TRec.H.242(2004)/Amd.1(09/2005)iITU-TRecommendationH.242Systemforestablishingcommunicationbetweenaudiovisualterminalsusingdigitalchannelsupto2Mbit/sAmendment1Supportfor14kHzaudiobandwidthextensionofG.722.1AnnexCinH.242SummaryThisamendmentaddstheBAScodesignallingandH.221multiplexallocationtosupportAnnexC/G.722.1(14kHzaudiobandwidthextensionoftheG.722.1)inH.320systems.SourceAmendment1toITU-TRecommendationH.242(2004)wasapprovedon13September2005byITU-TStudyGroup16(2005-2008)undertheITU-TRecommendationA.8procedure.iiITU-TRec.H.242(2004)/Amd.1(09/2005)FOREWORDTheInternationalTelecommunicationUnion(ITU)istheUnitedNationsspecializedagencyinthefieldoftelecommunications.TheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganofITU.ITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationAssembly(WTSA),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-Tstudygroupswhich,inturn,produceRecommendationsonthesetopics.TheapprovalofITU-TRecommendationsiscoveredbytheprocedurelaiddowninWTSAResolution1.InsomeareasofinformationtechnologywhichfallwithinITU-T'spurview,thenecessarystandardsarepreparedonacollaborativebasiswithISOandIEC.NOTEInthisRecommendation,theexpressionAdministrationisusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.CompliancewiththisRecommendationisvoluntary.However,theRecommendationmaycontaincertainmandatoryprovisions(toensuree.g.interoperabilityorapplicability)andcompliancewiththeRecommendationisachievedwhenallofthesemandatoryprovisionsaremet.Thewordsshallorsomeotherobligatorylanguagesuchasmustandthenegativeequivalentsareusedtoexpressrequirements.TheuseofsuchwordsdoesnotsuggestthatcompliancewiththeRecommendationisrequiredofanyparty.INTELLECTUALPROPERTYRIGHTSITUdrawsattentiontothepossibilitythatthepracticeorimplementationofthisRecommendationmayinvolvetheuseofaclaimedIntellectualPropertyRight.ITUtakesnopositionconcerningtheevidence,validityorapplicabilityofclaimedIntellectualPropertyRights,whetherassertedbyITUmembersorothersoutsideoftheRecommendationdevelopmentprocess.AsofthedateofapprovalofthisRecommendation,ITUhadnotreceivednoticeofintellectualproperty,protectedbypatents,whichmayberequiredtoimplementthisRecommendation.However,implementorsarecautionedthatthismaynotrepresentthelatestinformationandarethereforestronglyurgedtoconsulttheTSBpatentdatabase.ITU2005Allrightsreserved.Nopartofthispublicationmaybereproduced,byanymeanswhatsoever,withoutthepriorwrittenpermissionofITU.ITU-TRec.H.242(2004)/Amd.1(09/2005)iiiCONTENTSPage1)ChangestoTable52–BAScapabilitiesthatcanbeincludedinavalidcapabilityset(Note1)...................................................................................................................12)ChangestoAppendixVI..............................................................................................1ITU-TRec.H.242(2004)/Amd.1(09/2005)1ITU-TRecommendationH.242Systemforestablishingcommunicationbetweenaudiovisualterminalsusingdigitalchannelsupto2Mbit/sAmendment1Supportfor14kHzaudiobandwidthextensionofG.722.1AnnexCinH.2421)ChangestoTable52–BAScapabilitiesthatcanbeincludedinavalidcapabilityset(Note1)UpdateTable52asfollows:Table52/H.242–BAScapabilitiesthatcanbeincludedinavalidcapabilityset(Note1)Au