ITU-TH.283(051999)(英)Remotedevicecontrollogical…….pdf

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1、INTERNATIONALTELECOMMUNICATIONUNION+TELECOMMUNICATION(05/99)STANDARDIZATIONSECTOROFITUSERIESH:AUDIOVISUALANDMULTIMEDIASYSTEMSInfrastructureofaudiovisualservices–Relatedsystemsaspects5HPRWHGHYLFHFRQWUROORJLFDOFKDQQHOWUDQVSRUWITU-TRecommendationH.283(PreviouslyCCITTRecommendati

2、on)ITU-TH-SERIESRECOMMENDATIONS$8',29,68$/$1'08/7,0(',$6<67(06CharacteristicsoftransmissionchannelsusedforotherthantelephonepurposesH.10–H.19Useoftelephone-typecircuitsforvoice-frequencytelegraphyH.20–H.29TelephonecircuitsorcablesusedforvarioustypesoftelegraphtransmissionorH.30–H.39simulta

3、neoustransmissionTelephone-typecircuitsusedforfacsimiletelegraphyH.40–H.49CharacteristicsofdatasignalsH.50–H.99CHARACTERISTICSOFVISUALTELEPHONESYSTEMSH.100–H.199INFRASTRUCTUREOFAUDIOVISUALSERVICESGeneralH.200–H.219TransmissionmultiplexingandsynchronizationH.220–H.229SystemsaspectsH.230–H.239Com

4、municationproceduresH.240–H.259CodingofmovingvideoH.260–H.2795HODWHGVWHPVDVSHFWV+±+SystemsandterminalequipmentforaudiovisualservicesH.300–H.399SupplementaryservicesformultimediaH.450–H.499)RUIXUWKHUGHWDLOVSOHDVHUHIHUWR,787/LVWRI5HFRPPHQGDWLRQV,7875(&200(1'$7,21+

5、5(027('(9,&(&21752//2*,&$/&+$11(/75$1632576XPPDUThisRecommendationdescribesthelogicalchanneltransporttocarrytheremotedevicecontrolprotocolformultimediaapplications(RecommendationH.282)forusewithsystemsthatusepacketswitchednetworks,suchasthoseaccordingtoRecommendationH.323.ThisRecommendat

6、iondescribesthelogicalchanneltransport(LCT)servicesandprotocol.LCTcancarryH.282protocolinanH.323point-to-pointormultipointconference.LCTisusedwithinabidirectional,unreliableH.245logicalchannel.LCTprovidesthefollowingservices,accessedatitsserviceaccesspoint:•managingtheNodeListofallRDCparticipan

7、tsintheconference;•exchangeofH.282devicelistcapabilityinformation;•sendingandreceivingH.282protocolmessagesbetweennodes.6RXUFHITU-TRecommendationH.283waspreparedbyITU-TStudyGroup16(1997-2000)andwasapprovedundertheWTSCResolutionNo.