ITU-TI.251.6(021995)(英)Numberidentificationsupplementary…….pdf

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1、INTERNATIONALTELECOMMUNICATIONUNION)45 4)TELECOMMUNICATION(02/95)STANDARDIZATIONSECTOROFITU).4%'2!4%$3%26)#%3$)')4!,.%47/2+)3$.3%26)#%#!0!"),)4)%3#/..%#4%$,).%)$%.4)&)#!4)/.2%342)#4)/.#/,2)45 42ECOMMENDATION)(Previously“CCITTReco

2、mmendation”)FOREWORDTheITU-T(TelecommunicationStandardizationSector)isapermanentorganoftheInternationalTelecommunicationUnion(ITU).TheITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommen-dationsonthemwithaviewtostandardizingtelec

3、ommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationConference(WTSC),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-TStudyGroupswhich,intheirturn,produceRecommendationsonthesetopics.TheapprovalofRecommendationsbytheMembersofthe

4、ITU-TiscoveredbytheprocedurelaiddowninWTSCResolutionNo.1(Helsinki,March1-12,1993).ITU-TRecommendationI.251.6wasrevisedbyITU-TStudyGroup1(1993-1996)andwasapprovedundertheWTSCResolutionNo.1procedureonthe21stFebruary1995.___________________NOTEInthisRecommendation

5、,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.ãITU1995Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotoco

6、pyingandmicrofilm,withoutpermissioninwritingfromtheITU.CONTENTSRecommendationI.251.6(02/95)Page1Definition.......................................................................................................................................................12De

7、scription.....................................................................................................................................................12.1Generaldescription.................................................................................

8、..........................................12.2Specificterminology............................................................................................................