ISO IEC 14474-1998 Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Functional requi.pdf

1、BC Referencenumbe r ISO/IEC14474:1998(E) INTERNATIONAL STANDARD ISO/IEC 14474 Firstedition 19981215 Informationtechnology Telecommunicationsandinformation exchangebetweensystemsPrivate IntegratedServicesNetworkFunctional requirementsforstaticcircuitmode interPINXconnections Technologiesdelinformatio

2、nTlcommunicationsetchange dinformationentresystmesRseauprivintgrationdeservices ExigencesfonctionnellespourlesconnexionsinterPINXenmodecircuit statiqueISO/IEC14474:1998(E) ISO/IEC1998 Allrightsreserved.Unlessotherwisespecified,nopartofthispublicationmaybereproducedorutilizedinany formorbyanymeans,el

3、ectronicormechanical,includingphotocopyingandmicrofilm,withoutpermissionin writingfromthepublisher. ISO/IECCopyrightOfficeCasepostale56CH1211Genve20Switzerland PrintedinSwitzerland ii Foreword ISO(theInternationalOrganizationforStandardization)andIEC(theInternational ElectrotechnicalCommission)formt

4、hespecializedsystemforworldwidestandardization. NationalbodiesthataremembersofISOorIECparticipateinthedevelopmentof InternationalStandardsthroughtechnicalcommitteesestablishedbytherespective organizationtodealwithparticularfieldsoftechnicalactivity.ISOandIECtechnical committeescollaborateinfieldsofm

5、utualinterest.Otherinternationalorganizations, governmentalandnongovernmental,inliaisonwithISOandIEC,alsotakepartinthe work. Inthefieldofinformationtechnology,ISOandIEChaveestablishedajointtechnical committee,ISO/IECJTC1.DraftInternationalStandardsadoptedbythejointtechnical committeearecirculatedton

6、ationalbodiesforvoting.PublicationasanInternational Standardrequiresapprovalbyatleast75%ofthenationalbodiescastingavote. InternationalStandardISO/IEC14474waspreparedbyJointTechnicalCommittee ISO/IECJTC1, Informationtechnology,SubcommitteeSC6, Telecommunicationsand informationexchangebetweensystems.

7、AnnexAformsanintegralpartofthisInternationalStandard.INTERNATIONALSTANDARD ISO/IEC ISO/IEC14474:1998(E) 1 InformationtechnologyTelecommunicationsandinformationexchange betweensystemsPrivateIntegratedServicesNetworkFunctional requirementsforstaticcircuitmodeinterPINXconnections 1.Scope ThisInternatio

8、nalStandardisapartofthefunctionalrequirementsforthePrivateIntegratedServicesNetwork(PISN) anddefinesthefunctionsandproceduresthatarerequiredbyPrivateIntegratedServicesNetworkexchanges(PINXs) andtheinterveningnetwork(IVN)inordertoestablishInterPINXConnections(IPC).TheIPCisusedforthetransfer ofsignall

9、inganduserinformationbetweenPINXs. ThePrivateSignallingSystemNo.1(PSS1)asdefinedinISO/IEC11572and11574definesthesignallingprocedures andprotocolforcallcontrolbetweenPINXsattheQreferencepoint.Theseproceduresareindependentofthetypesof IVNs,calledscenariosusedtointerconnectthePINXs.ISO/IECTR14475descri

10、bestheuseofvarioustypesofIVNs whichprovidetheinterconnectionsofPINXs. InordertoconnectaPINXtoanotherPINX,mappingfunctionsarerequiredtoadaptthespecificinterfacesattheC referencepointtotheapplicationattheQreferencepoint.Assuch,mappingfunctionsprovideforphysicaladaptation totheinterfaceattheCreferencep

11、oint.Mappingfunctionsalsoprovideforthemappingofuserchannelsand signallinginformationattheQreferencepointtotheappropriatechannelsortimeslotsattheCreferencepoint.TheC andQreferencepointsaredefinedinISO/IEC115791. ThetypesofinterfacesattheCreferencepointcoveredbythisInternationalStandardare: 1 1544kbit

12、/sunstructureddigitalleasedline 2 1544kbit/sstructureddigitalleasedline 3 2048kbit/sunstructureddigitalleasedline 4 2048kbit/sstructureddigitalleasedline 5 64kbit/sunrestricteddigitalleasedline 6 1544kbit/sISDNPrimaryRateusernetworklayer1interface 7 2048kbit/sISDNPrimaryRateusernetworklayer1interfac

13、e 8 ISDNBasicRateusernetworklayer1interface AttheQreferencepointthemappingsprovidea64kbit/sserviceforuserchannelsandapacketmodeserviceforthe signallingchannel.Theappliedmappingisastaticmapping,i.e.thereisafixedrelationshipbetweenuserand signallingchannelsattheQreferencepointandthetimeslotsoftheinter

14、faceattheCreferencepoint.Anychangesare subjecttoadministrativeactions. ThisInternationalStandardspecifiesPINXmappingfunctionsbetweentheQreferencepointandtheCreferencepoint forIVNswhichprovideeitherdedicatedorsemipermanent,nonuseractivation,circuitmodeIPCs.ThededicatedIPC istheconnectionpermanentlyes

15、tablished,usuallyforthedurationofacontractualperiod.ThesemipermanentIPCis theconnectionwhoseresourcesarereservedforspecifiedtimesduringacontractualperiod.ThesemipermanentIPCis establishedbymanagementcontrolwithorwithoutuseractivations.InthisInternationalStandard,thesemipermanent IPCestablishedbymana

16、gementcontrolwithuseractivationisoutsidethescope. TheIVNcanbeadedicatedphysicallink,dedicatedtransmissionsystemoracrossconnectsystem,orsemipermanent connectionsystem.IVNswhichincludeinversemulitlexertechniques(e.g.channelaggregationinaccordancewith ISO/IEC13871)arecoveredbythisInternationalStandards

17、ofarastheysupportoneoftheinterfaceslistedabove. ThisInternationalStandardalsospecifiesmappinginformation.AtbothsidesofthePINX,mappinginformationis requiredtoadministerthescenarios. ThisInternationalStandardisapplicabletoPINXswhichcanbeinterconnectedtoformaPrivateIntegratedServices Network(PISN)andwh

18、ichsupportsignallingprotocolsattheQreferencepoint.ISO/IEC14474:1998(E) ISO/IEC 2 2.Conformance InordertoconformtothisInternationalStandard,aPINXshallsatisfytherequirementsidentifiedintheProtocol ImplementationConformanceStatement(PICS)proformainannexA. 3.Normative References Thefollowingstandardscon

19、tainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthis InternationalStandard.Atthetimeofpublication,theeditionsindicatedwerevalid.Allstandardsaresubjectto revision,andpartiestoagreementsbasedonthisInternationalStandardareencouragedtoinvestigatethepossibilityof applyingthemostrecen

20、teditionsofthestandardsindicatedbelow.MembersofIECandISOmaintainregistersof currentlyvalidInternationalStandards. 1 ISO/IEC115791:1994,InformationtechnologyTelecommunicationsandinformationexchangebetween systemsPrivateintegratedservicesnetworkPart1:ReferenceconfigurationforPISNExchanges(PINX) . 2 IS

21、O/IECTR14475:1996, InformationtechnologyTelecommunicationsandinformationexchangebetween systemsPrivateIntegratedServicesNetworkArchitectureandScenariosforPrivateIntegratedServices Networking. 3 ISO/IEC11572:1997, InformationtechnologyTelecommunicationsandinformationexchangebetweensystems PrivateInte

22、gratedServicesNetworkCircuitmodebearerservicesInterexchangesignallingprocedures andprotocol . 4 ISO/IEC11574:1994, InformationtechnologyTelecommunicationsandinformationexchangebetweensystems PrivateIntegratedServicesNetworkCircuitmode64kbit/sbearerservicesServicedescription, functionalcapabilitiesan

23、dinformationflows . 5 ITUTRec.G.703(1991), Physical/electricalcharacteristicsofhierarchicaldigitalinterface . 6 ITUTRec.G.704(1995), Synchronousframestructuresusedatprimaryandsecondaryhierarchicallevels . 7 ITUTRec.G.706(1991), Framealignmentandcyclicredundancycheck(CRC)proceduresrelatingtobasic fra

24、mestructuresdefinedinRecommendationG.704 . 8 ITUTRec.I.431(1993), PrimaryrateusernetworkinterfaceLayer1specification . 9 ITUTRec.I.430(1995), BasicrateusernetworkinterfaceLayer1specification . 10 ITUTRec.I.412(1988), ISDNusernetworkinterfacesInterfacestructuresandaccesscapabilities . 11 ITUTRec.I.14

25、0(1993), AttributeTechniqueforthecharacterizationofTelecommunicationServicessupported byanISDNandNetworkCapabilitiesofanISDN . 12 ITUTRec.I.210(1993), PrinciplesofTelecommunicationServicesSupportedbyandISDNandtheMeansto describethem . 13 ITUTRec.Q.921(1993), ISDNUserNetworkInterfaceLayer2specificati

26、on . 14 ISO/IEC238236: 1) , InformationtechnologyVocabularyPart36:PrivateIntegratedServicesNetwork . 15 ISO/IEC13871:1995, InformationtechnologyTelecommunicationsandinformationexchangebetweensystems PrivatetelecommunicationsnetworksDigitalchannelaggregation . 1)Tobepublished.ISO/IEC ISO/IEC14474:199

27、8(E) 3 4.Definitions ForthepurposesofthisInternationalStandard,thefollowingdefinitionsapply. 4.1External definitions PISN(PrivateIntegratedServicesNetwork) 14 PINX(PrivateIntegratedServicesNetworkExchange) 14 IVN(InterveningNetwork) 14 SW(SwitchingFunctionalgrouping) 1 MP(MappingFunctionalgrouping)

28、1 QReferencePoint 1 CReferencePoint 1 IPC(InterPINXConnection) 14 IPL(InterPINXLink) 14 4.2Specific Definitions 4.2.1Channel Ameansofbidirectionaltransmissionofuserorsignallinginformationbetweentwopoints. 4.2.1.1Dq channel Achannelusedtoconveysignallinginformationincludingcallcontrolinformationbetwe

29、entheQreferencepointsof twopeerPINXs. 4.2.1.2Uq channel AchannelusedtoconveyuserinformationbetweentheQreferencepointsoftwoPINXs. 4.2.2Signalling Functions 4.2.2.1 QSIG(SignallinginformationflowattheQreferencepoint) Thegenerictermdescribingthesignallinginformationflows(i.e.notaspecificsignallingproto

30、col),withinaDq channel. 4.2.2.2 CSIG(SignallinginformationflowattheCreferencepoint) Thegenerictermdescribingaccesssignallinginformationflows(i.e.notaspecificsignallingprotocol),betweenaPINX andanIVN,attheCreferencepoint. 4.3 SymbolsandAbbreviations B Timeslotprovidingof64kbit/sbearercapability C CRe

31、ferencePoint Dq Dqchannel IPC InterPINXConnection IVN InterveningNetwork MP MappingFunctionalgrouping PINX PrivateIntegratedServicesNetworkExchange Q QReferencePoint QAB IndicatesaQreferencepointthatisassociatedwiththeinterconnectionbetweenPINXAandB QAC IndicatesaQreferencepointthatisassociatedwitht

32、heinterconnectionbetweenPINXAandC. SW SwitchingFunctionalgrouping Uq UqchannelISO/IEC14474:1998(E) ISO/IEC 4 5.Introduction FortheconceptofmappingfunctionreferenceismadetoISO/IECTR144752. 5.1 TypeofIVN TheIVNssupportingpermanentcircuitmodeIPCsareasfollows: DedicatedTransmissionSystem SemiPermanently

33、establishedchannelsofcircuitmodenetwork 5.1.1 DedicatedTransmissionSystem TheIPCisprovidedbyatransmissionmechanism.TheIPCisestablishedbymanagement,seeFigure5.1. Q nUq+Dq PINX Q nUq+Dq PINX MP MP CC PhysicalMedium Figure5.1DedicatedPhysicalmedium ThetransmissionMediumcanprovideunstructuredorchanneliz

34、edbitstream. 5.1.2SemiPermanent Connection ThededicatedorthesemipermanentIPCsareprovidedbyasemipermanentcircuitmodemechanismintheintervening network,inwhichtheIPCsarepermanentlyestablishedbymanagementcontrolwithorwithoutuseractivation.The channelsonanIPC(signallinganduserinformationchannelsbetweenas

35、sociatedtwoPINXs)attheQreferencepoint aremappedontopreassignedtimeslotsprovidingof64kbit/sbearercapabilityoftheIVNaccessattheCreference point. ThisscenarioprovidesmultipleIPCsleadingtodifferentPINXs. (m+n+2)B (m+1)B (n+1)B PINXA Q AB Q AC mU Q+D QAB nU Q+D QAC MP nU Q+D QAC PINXC MP PINXB Q AB mU Q+

36、D QAB MP Q AC C C C X IVN Figure5.2SemipermanentConnection 5.2 IVNInterfacetypes TheTable1showsthecategorizationofthescenariotypeofpermanentcircuitmodeinterPINXconnections.It categorizestheIVNtypesintermsofthecharacteristicsofthedigitalleasedlinefortheprovisionofIPC.IVNinterface typesareonlystandard

37、izedincertainregions.Theinternationalavailabilityofthefullbitstreamisoutsidethescopeof thisInternationalStandard.ISO/IEC ISO/IEC14474:1998(E) 5 Table5.1IVNInterfaceTypes IVNInterfaceTypes Structurization Note 1 Unstructured1544kbit/sdigitalleasedline 2 Structured1544kbit/sdigitalleasedline 1536kbit/

38、stimeslots Note1 3 Structured1544kbit/sdigitalleasedline 24x64kbit/stimeslots Note3 4 Unstructured2048kbit/sdigitalleasedline 1984kbit/stimeslots 5 Structured2048kbit/sdigitalleasedline 1984kbit/stimeslots Note2 6 Structured2048kbit/sdigitalleasedline 31x64kbit/stimeslots Note3 7 64kbit/sdigitalleas

39、edline 64kbit/stimeslot 8 ISDN1544kbit/sPrimaryRateInterface AccordingtoITUTRec.I.431 9 ISDN2048kbit/sPrimaryRateInterface AccordingtoITUTRec.I.431 10 ISDNBasicRateInterface AccordingtoITUTRec.I.430 Note1: ThistypeofleasedlinethatisusedtointerconnectPINXsisadigitaltransmissionlinkprovidingprimaryrat

40、e(1544 kbit/s)capability.Inthismappingtype,thederivedchannelattheQreferencepointshallbemappedontothetime slottheinformationtransferrateofwhichisat64kbit/swithoutalterationbetweenthePINXs. Note2: InEuropeandAustraliaitispossibletoget2048kbit/sleasedlinesintwodifferentways.Alternative1is unstructuredv

41、ersion,whichprovidesunstructuredbitstreamat2048kbit/s(thereisnochannelisation).Alternative2 isachannelizedversioninwhichtimeslot0isnotnecessarilytransparent.Normallyhowevertheleasedlineoffers theremaining31channelssothattheycanbeusedas1984kbit/soras31x64kbit/s. Forthecaseofanunstructuredleasedline,i

42、tshouldbeconsideredasoneIPCat2048kbit/s.Onepossiblemapping istomapitto31x64kbit/schannels.Forthestructuredcaseespeciallywhenusedwithacrossconnecttheinterface shouldbeconsideredasproviding31IPCscashat64kbit/s. Note3: Itisamakeofsubscription,whileall64kbit/stimeslotsarethoughconnectedendtoend.Timeslotsequence integrityisguranteed. 5.3 IPCBearerCapabilities IPCBearerCapabilitiesdependonIVNInterfacedescribinginthetablebelow. IneachIVNtypes,thebearercapabilitiesshallbetheassumeinbothPINXsforanygivenchannelattheQreference point.While,asadefau