ITU-T I.432.3 (02 1999)(英) B-ISDN user-network int

INTERNATIONALTELECOMMUNICATIONUNIONITU-TI.432.3TELECOMMUNICATIONSTANDARDIZATIONSECTOROFITU(02/99)SERIESI:INTEGRATEDSERVICESDIGITALNETWORKISDNuser-networkinterfaces–Layer1RecommendationsB-ISDNuser-networkinterface–Physicallayerspecification:1544kbit/sand2048kbitsoperationITU-TRecommendationI.432.3(PreviouslyCCITTRecommendation)ITU-TI-SERIESRECOMMENDATIONSINTEGRATEDSERVICESDIGITALNETWORKForfurtherdetails,pleaserefertoITU-TListofRecommendations.GENERALSTRUCTURETerminologyI.110–I.119DescriptionofISDNsI.120–I.129GeneralmodellingmethodsI.130–I.139TelecommunicationnetworkandserviceattributesI.140–I.149GeneraldescriptionofasynchronoustransfermodeI.150–I.199SERVICECAPABILITIESScopeI.200–I.209GeneralaspectsofservicesinISDNI.210–I.219CommonaspectsofservicesintheISDNI.220–I.229BearerservicessupportedbyanISDNI.230–I.239TeleservicessupportedbyanISDNI.240–I.249SupplementaryservicesinISDNI.250–I.299OVERALLNETWORKASPECTSANDFUNCTIONSNetworkfunctionalprinciplesI.310–I.319ReferencemodelsI.320–I.329Numbering,addressingandroutingI.330–I.339ConnectiontypesI.340–I.349PerformanceobjectivesI.350–I.359ProtocollayerrequirementsI.360–I.369GeneralnetworkrequirementsandfunctionsI.370–I.399ISDNUSER-NETWORKINTERFACESApplicationofI-seriesRecommendationstoISDNuser-networkinterfacesI.420–I.429Layer1RecommendationsI.430–I.439Layer2RecommendationsI.440–I.449Layer3RecommendationsI.450–I.459Multiplexing,rateadaptionandsupportofexistinginterfacesI.460–I.469AspectsofISDNaffectingterminalrequirementsI.470–I.499INTERNETWORKINTERFACESI.500–I.599MAINTENANCEPRINCIPLESI.600–I.699B-ISDNEQUIPMENTASPECTSATMequipmentI.730–I.739TransportfunctionsI.740–I.749ManagementofATMequipmentI.750–I.799RecommendationI.432.3(02/99)iITU-TRECOMMENDATIONI.432.3B-ISDNUSER-NETWORKINTERFACE–PHYSICALLAYERSPECIFICATION1544kbit/sAND2048kbit/sOPERATIONSummaryThisRecommendationcoversPhysicalLayercharacteristicsfortransportingATMcellsusingexistingPrimaryRateISDNsystems.Itincludesboth1544and2048kbit/sinterfacesattheTBandSBreferencepointsoftheB-ISDNUser-NetworkInterface(UNI).ThesePhysicalLayercharacteristicsmaybeusedtotakeadvantageofexistingtransmissionequipmentandbuildingwiring.ThisRecommendationispartoftheI.432-series,andincludesreferencestoRecommendationI.432.1ongeneralcharacteristics,andRecommendationI.432.2onOAMaspects.SourceITU-TRecommendationI.432.3waspreparedbyITU-TStudyGroup13(1997-2000)andwasapprovedundertheWTSCResolutionNo.1procedureonthe15thofFebruary1999.KeywordsATM,B-ISDN,UNI,User-NetworkInterface.RecommendationI.432.3(02/99)iiFOREWORDITU(InternationalTelecommunicationUnion)istheUnitedNationsSpecializedAgencyinthefieldoftelecommunications.TheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganoftheITU.TheITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationConference(WTSC),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-TStudyGroupswhich,intheirturn,produceRecommendationsonthesetopics.TheapprovalofRecommendationsbytheMembersoftheITU-TiscoveredbytheprocedurelaiddowninWTSCResolutionNo.1.InsomeareasofinformationtechnologywhichfallwithinITU-T’spurview,thenecessarystandardsarepreparedonacollaborativebasiswithISOandIEC.NOTEInthisRecommendationthetermrecognizedoperatingagency(ROA)includesanyindividual,company,corporationorgovernmentalorganizationthatoperatesapubliccorrespondenceservice.ThetermsAdministration,ROAandpubliccorrespondencearedefinedintheConstitutionoftheITU(Geneva,1992).INTELLECTUALPROPERTYRIGHTSTheITUdrawsattentiontothepossibilitythatthepracticeorimplementationofthisRecommendationmayinvolvetheuseofaclaimedIntellectualPropertyRight.TheITUtakesnopositionconcerningtheevidence,validityorapplicabilityofclaimedIntellectualPropertyRights,whetherassertedbyITUmembersorothersoutsideoftheRecommendationdevelopmentprocess.AsofthedateofapprovalofthisRecommendation,theITUhadnotreceivednoticeofintellectualproperty,protectedbypatents,whichmayberequiredtoimplementthisRecommendation.However,implementorsarecautionedthatthismaynotrepresentthelatestinformationandarethereforestronglyurgedtoconsulttheTSBpatentdatabase.ITU1999Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromtheITU.RecommendationI.432.3(02/99)iiiCONTENTSPage1Scope..........................................................................................................................12Background................................................................................................................13References..................................................................................................................14Definitionsandabbreviations.....................................................................................24.1Definitions...............................................................................