ITU-T X.1 (03 2000) International user classes of

INTERNATIONALTELECOMMUNICATIONUNIONX.1TELECOMMUNICATIONSTANDARDIZATIONSECTOROFITU(03/00)SERIESX:DATANETWORKSANDOPENSYSTEMCOMMUNICATIONSPublicdatanetworks–ServicesandfacilitiesInternationaluserclassesofservicein,andcategoriesofaccessto,publicdatanetworksandintegratedservicesdigitalnetworks(ISDNs)ITU-TRecommendationX.1(PreviouslyCCITTRecommendation)ITU-TX-SERIESRECOMMENDATIONSDATANETWORKSANDOPENSYSTEMCOMMUNICATIONSForfurtherdetails,pleaserefertoITU-TListofRecommendations.PUBLICDATANETWORKSServicesandfacilitiesX.1–X.19InterfacesX.20–X.49Transmission,signallingandswitchingX.50–X.89NetworkaspectsX.90–X.149MaintenanceX.150–X.179AdministrativearrangementsX.180–X.199OPENSYSTEMSINTERCONNECTIONModelandnotationX.200–X.209ServicedefinitionsX.210–X.219Connection-modeprotocolspecificationsX.220–X.229Connectionless-modeprotocolspecificationsX.230–X.239PICSproformasX.240–X.259ProtocolIdentificationX.260–X.269SecurityProtocolsX.270–X.279LayerManagedObjectsX.280–X.289ConformancetestingX.290–X.299INTERWORKINGBETWEENNETWORKSGeneralX.300–X.349SatellitedatatransmissionsystemsX.350–X.399MESSAGEHANDLINGSYSTEMSX.400–X.499DIRECTORYX.500–X.599OSINETWORKINGANDSYSTEMASPECTSNetworkingX.600–X.629EfficiencyX.630–X.639QualityofserviceX.640–X.649Naming,AddressingandRegistrationX.650–X.679AbstractSyntaxNotationOne(ASN.1)X.680–X.699OSIMANAGEMENTSystemsManagementframeworkandarchitectureX.700–X.709ManagementCommunicationServiceandProtocolX.710–X.719StructureofManagementInformationX.720–X.729ManagementfunctionsandODMAfunctionsX.730–X.799SECURITYX.800–X.849OSIAPPLICATIONSCommitment,ConcurrencyandRecoveryX.850–X.859TransactionprocessingX.860–X.879RemoteoperationsX.880–X.899OPENDISTRIBUTEDPROCESSINGX.900–X.999RecommendationX.1(03/00)iITU-TRECOMMENDATIONX.1INTERNATIONALUSERCLASSESOFSERVICEIN,ANDCATEGORIESOFACCESSTO,PUBLICDATANETWORKSANDINTEGRATEDSERVICESDIGITALNETWORKS(ISDNs)SummaryThisRecommendationdescribesinternationaluserclassesofservicein,categoriesofaccessto,publicdatanetworksandIntegratedServicesDigitalNetworks(ISDN).Detailsforleasedcircuit,circuit-switched,packet-switched,andframerelaydatatransmissionservicesareprovided.ThisrevisionincludestheaccesstoFRDTSviaB-ISDN.SourceITU-TRecommendationX.1wasrevisedbyITU-TStudyGroup7(1997-2000)andwasapprovedundertheWTSCResolutionNo.1procedureon31March2000.iiRecommendationX.1(03/00)FOREWORDITU(InternationalTelecommunicationUnion)istheUnitedNationsSpecializedAgencyinthefieldoftelecommuni-cations.TheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganoftheITU.TheITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationConference(WTSC),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-TStudyGroupswhich,intheirturn,produceRecommendationsonthesetopics.TheapprovalofRecommendationsbytheMembersoftheITU-TiscoveredbytheprocedurelaiddowninWTSCResolutionNo.1.InsomeareasofinformationtechnologywhichfallwithinITU-T’spurview,thenecessarystandardsarepreparedonacollaborativebasiswithISOandIEC.NOTEInthisRecommendation,theexpressionAdministrationisusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.INTELLECTUALPROPERTYRIGHTSTheITUdrawsattentiontothepossibilitythatthepracticeorimplementationofthisRecommendationmayinvolvetheuseofaclaimedIntellectualPropertyRight.TheITUtakesnopositionconcerningtheevidence,validityorapplicabilityofclaimedIntellectualPropertyRights,whetherassertedbyITUmembersorothersoutsideoftheRecommendationdevelopmentprocess.AsofthedateofapprovalofthisRecommendation,theITUhadnotreceivednoticeofintellectualproperty,protectedbypatents,whichmayberequiredtoimplementthisRecommendation.However,implementorsarecautionedthatthismaynotrepresentthelatestinformationandarethereforestronglyurgedtoconsulttheTSBpatentdatabase.
ITU2000Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromtheITU.RecommendationX.1(03/00)iiiCONTENTSPage1Introduction....................................................................................................................................................12Accesstoaleasedcircuitdatatransmissionservice.......................................................................................33Accesstoacircuit-switcheddatatransmissionservice...................................................................................44Accesstoapacket-switcheddatatransmissionservice..................................................................................65Accesstoaframerelaydatatransmissionservice..........................................................................................10RecommendationX.1(03/00)1RecommendationX.1RecommendationX.1(03/00)INTERNATIONALUSERCLASSESOFSERVICEIN,ANDCATEGORIESOFACCESSTO,PUBLICDATANETWORKSANDINTEGRATEDSERVICESDIGITALNETWORKS(ISDNs)(Geneva,