ITU-TF.813(021995)(英)Virtualpathserviceforreserved…….pdf

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1、INTERNATIONALTELECOMMUNICATIONUNION)45 4&TELECOMMUNICATION(02/95)STANDARDIZATIONSECTOROFITU/0%2!4)/.3!.$15!,)49/&3%26)#%)3$.3%26)#%36)245!,0!4(3%26)#%&/22%3%26%$!.$0%2-!.%.4#/--5.)#!4)/.3)45 4Recommendation&(Previously“CCITTRecommendation”)FOREWORDTheITU-T(Teleco

2、mmunicationStandardizationSector)isapermanentorganoftheInternationalTelecommunicationUnion(ITU).TheITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommen-dationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardization

3、Conference(WTSC),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-TStudyGroupswhich,intheirturn,produceRecommendationsonthesetopics.TheapprovalofRecommendationsbytheMembersoftheITU-TiscoveredbytheprocedurelaiddowninWTSCResolutionNo.1(Helsinki,March1-12,1993).ITU-TRecommendationF.813w

4、aspreparedbyITU-TStudyGroup1(1993-1996)andwasapprovedundertheWTSCResolutionNo.1procedureonthe21stofFebruary1995.___________________NOTEInthisRecommendation,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.ãITU1995Allright

5、sreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromtheITU.CONTENTSRecommendationF.813(02/95)Page1Definition..........................................................................

6、.............................................................................12Description.....................................................................................................................................................12.1Generaldescription....................................

7、.......................................................................................12.2Specificterminology............................................................................................................