ITU-T I.233.1-2 (10 1991) (英) Frame mode bearer services

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1、INTERNATIONALTELECOMMUNICATIONUNION##)44)THEINTERNATIONALTELEGRAPHANDTELEPHONECONSULTATIVECOMMITTEE).4%'2!4%$3%26)#%3$)')4!,.%47/2+)3$.'%.%2!,3425#452%!.$3%26)#%#!0!"),)4)%3&2!-%-/$%"%!2%23%26)#%32ECOMMENDATION)Geneva,1992FOREWORDTheCCIT

2、T(theInternationalTelegraphandTelephoneConsultativeCommittee)isapermanentorganoftheInternationalTelecommunicationUnion(ITU).CCITTisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsona

3、worldwidebasis.ThePlenaryAssemblyofCCITTwhichmeetseveryfouryears,establishesthetopicsforstudyandapprovesRecommendationspreparedbyitsStudyGroups.TheapprovalofRecommendationsbythemembersofCCITTbetweenPlenaryAssembliesiscoveredbytheprocedurelaiddowninCCITTResolutionNo.

4、2(Melbourne,1988).RecommendationI.233waspreparedbyStudyGroupXVIIIandwasapprovedundertheResolutionNo.2procedureonthe25thofOctober1991.___________________CCITTNOTES1)InthisRecommendation,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunication

5、Administrationandarecognizedprivateoperatingagency.2)AlistofabbreviationsusedinthisRecommendationcanbefoundinAnnexEandC.ãITU1992Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmic

6、rofilm,withoutpermissioninwritingfromtheITU.RecommendationI.233RecommendationI.233FRAMEMODEBEARERSERVICESRecommendationI.210describestheprinciplesfordefiningtelecommunicationservicessupportedbyanISDNincludingtheconceptofbearerservices,teleservicesandsupplementaryser

7、vices.Italsoprovidesthemeansforthedefinitionanddescriptionofsuchservices.ArecommendedsetofbearerservicecategoriesisdefinedinRecommendationI.230.ThepurposeofthisRecommendationistodescribearecommendedsetofframemodebearerservices(FMBS),todescribeindividualframemodebear

8、erservicesandtorecommendtheirprovisioninanISDN.Bearerservicesaredescribedbyprosedefinitionsanddescriptions,byattributesandtheirvaluesandby