ITU-T H.247 (09 1998) (英) Multipoint extension for broadband ……

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1、INTERNATIONALTELECOMMUNICATIONUNIONITU-TH.247TELECOMMUNICATION(09/98)STANDARDIZATIONSECTOROFITUSERIESH:AUDIOVISUALANDMULTIMEDIASYSTEMSInfrastructureofaudiovisualservices–CommunicationproceduresMultipointextensionforbroadbandaudiovisualcommunicationsystemsandterminalsITU-TRecommendationH.247(Previous

2、lyCCITTRecommendation)ITU-TH-SERIESRECOMMENDATIONSAUDIOVISUALANDMULTIMEDIASYSTEMSCharacteristicsoftransmissionchannelsusedforotherthantelephonepurposesH.10–H.19Useoftelephone-typecircuitsforvoice-frequencytelegraphyH.20–H.29TelephonecircuitsorcablesusedforvarioustypesoftelegraphtransmissionorH.30–H.

3、39simultaneoustransmissionTelephone-typecircuitsusedforfacsimiletelegraphyH.40–H.49CharacteristicsofdatasignalsH.50–H.99CHARACTERISTICSOFVISUALTELEPHONESYSTEMSH.100–H.199INFRASTRUCTUREOFAUDIOVISUALSERVICESGeneralH.200–H.219TransmissionmultiplexingandsynchronizationH.220–H.229SystemsaspectsH.230–H.23

4、9CommunicationproceduresH.240–H.259CodingofmovingvideoH.260–H.279RelatedsystemsaspectsH.280–H.299SystemsandterminalequipmentforaudiovisualservicesH.300–H.399SupplementaryservicesformultimediaH.450–H.499Forfurtherdetails,pleaserefertoITU-TListofRecommendations.ITU-TRECOMMENDATIONH.247MULTIPOINTEXTENS

5、IONFORBROADBANDAUDIOVISUALCOMMUNICATIONSYSTEMSANDTERMINALSSummaryThisRecommendationdescribesandspecifiesthemeansbywhichthreeormoreH.310audiovisualcommunicationterminalsoperatinginthenativemodemaycommunicatesimultaneouslyoverB-ISDNand/orcustomerpremisesATMnetwork,suchcommunicationbeingdesignateda"mul

6、tipointcall".ItalsocoversconferenceconfigurationsincludingotherH-seriesterminals.SourceITU-TRecommendationH.247waspreparedbyITU-TStudyGroup16(1997-2000)andwasapprovedundertheWTSCResolutionNo.1procedureonthe25thofSeptember1998.FOREWORDITU(InternationalTelecommunicationUnion)istheUnitedNationsSpeciali

7、zedAgencyinthefieldoftelecommunications.TheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganoftheITU.TheITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingReco