ITU-T F.740 (08 1993) (英) Audiovisual interactive services

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1、INTERNATIONALTELECOMMUNICATIONUNION)45 4&TELECOMMUNICATION(08/93)STANDARDIZATIONSECTOROFITU/0%2!4)/.3!.$15!,)49/&3%26)#%!5$)/6)35!,3%26)#%!5$)/6)35!,).4%2!#4)6%3%26)#%3)45 4Recommendation&(Previously“CCITTRecommendation”)FOREWORDTheITU-T(Tel

2、ecommunicationStandardizationSector)isapermanentorganoftheInternationalTelecommunicationUnion(ITU).TheITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommen-dationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorl

3、dTelecommunicationStandardizationConference(WTSC),whichmeetseveryfouryears,etablishesthetopicsforstudybytheITU-TStudyGroupswhich,intheirturn,produceRecommendationsonthesetopics.TheapprovalofRecommendationsbytheMembersoftheITU-TiscoveredbytheprocedurelaiddowninWTSCRes

4、olutionNo.1(Helsinki,March1-12,1993).ITU-TRecommendationF.740waspreparedbyITU-TStudyGroup1(1993-1996)andwasapprovedundertheWTSCResolutionNo.1procedureonthe31stofAugust1993.___________________NOTEInthisRecommendation,theexpression“Administration”isusedforconcisenessto

5、indicatebothatelecommunicationadministrationandarecognizedoperatingagency.ãITU1994Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromtheITU.CON

6、TENTSRecommendationF.740(08/93)Page1Introduction....................................................................................................................................................12DefinitionoftheAVIService............................................

7、............................................................................13DescriptionoftheAVIService......................................................................................................................23.1AVIgeneralaspects........................

8、..................................................................................................23.2Themainroles.................