ISO 11898-1-2003原版完整標(biāo)準(zhǔn)

ProvidedbyIHSunderlicensewithISONoreproductionornetworkingpermittedwithoutlicensefromIHSProvidedbyIHSunderlicensewithISONoreproductionornetworkingpermittedwithoutlicensefromIHSSoldto:IHSStandardsStorePurchase,348409NotforResale,05/17/200611:48:43MDTINTERNATIONALSTANDARD

Firstedition2003-12-01Roadvehicles—Controllerareanetwork(CAN)—Part1:DatalinklayerandphysicalsignallingVéhiculesroutiers—Gestionnairederéseaudecommunication(CAN)—Partie1:CoucheliaisonetsignalisationphysiqueReferencenumberISO11898-1:2003(E)CopyrightInternationalOrganizationforStandardization

?ISO2003ISO11898-1:2003(E)PDFdisclaimerPDFdisclaimerThisPDFfilemaycontainembeddedtypefaces.InaccordancewithAdobe'slicensingpolicy,thisfilemaybeprintedorviewedbutshallnotbeeditedunlessthetypefaceswhichareembeddedarelicensedtoandinstalledonthecomputerperformingtheediting.Indownloadingthisfile,partiesacceptthereintheresponsibilityofnotinfringingAdobe'slicensingpolicy.TheISOCentralSecretariatacceptsnoliabilityinthisarea.AdobeisatrademarkofAdobeSystemsIncorporated.DetailsofthesoftwareproductsusedtocreatethisPDFfilecanbefoundintheGeneralInforelativetothefile;thePDF-creationparameterswereoptimizedforprinting.EverycarehasbeentakentoensurethatthefileissuitableforusebyISOmemberbodies.Intheunlikelyeventthataproblemrelatingtoitisfound,pleaseinformtheCentralSecretariatattheaddressgivenbelow.?ISO2003Allrightsreserved.Unlessotherwisespecified,nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromeitherISOattheaddressbeloworISO'smemberbodyinthecountryoftherequester.ISOcopyrightofficeCasepostale56CH-1211Geneva20Tel.+41227490111Fax+41227490947E-mailcopyright@WebPublishedinSwitzerlandCopyrightInternationalOrganizationforStandardization

?ISO2003—AllrightsreservedProvidedbyIHSunderlicensewithISONoreproductionornetworkingpermittedwithoutlicensefromIHSSoldto:IHSStandardsStorePurchase,348409NotforResale,05/17/200611:48:43MDTProvidedbyIHSunderlicensewithISONoreproductionornetworkingpermittedwithoutlicensefromIHSSoldto:IHSStandardsStorePurchase,348409NotforResale,05/17/200611:48:43MDTISO11898-1:2003(E)Contents PageForeword vScope 1Conformance 1Normativereferences 1Termsanddefinitions 2Symbolsandabbreviatedterms 3BasicconceptsofCAN 5CANproperties 5Frames 5Busaccessmethod 5Informationrouting 5Systemflexibility 5Dataconsistency 5Remotedatarequest 6Errordetection 6Errorsignallingandrecoverytime 6ACK 6Automaticretransmission 6Faultconfinement 6Error-active 6Error-passive 6Bus-off 7LayeredarchitectureofCAN 7ReferencetoOSImodel 7Protocolspecification 8Formatdescriptionofservices 9LLCinterface 9DescriptionofLLCsublayer 10General 10ServicesofLLCsublayer 10FunctionsofLLCsublayer 14StructureofLLCframes 14LimitedLLCframes 16InterfacebetweenLLCandMAC 16Services 16TTCoption 16DescriptionofMACsublayer 17General 17ServicesofMACsublayer 17FunctionalmodelofMACsublayerarchitecture 21StructureofMACframes 24Framecoding 29Orderofbittransmission 30Framevalidation 30Mediumaccessmethod 30Errordetection 32Errorsignalling 33?ISO2003—AllrCopyrightInternationalOrganizationforStandardizationightsreserved iii?ISO2003—AllrISO11898-1:2003(E)Overloadsignalling 33Busmonitoring 33LLCandMACsublayerconformance 33Physicallayer 33General 33Functionalmodel 33ServicesofPL 34PLSsublayerspecification 35PLS-PMAinterfacespecification 39Descriptionofsupervisor 39Faultconfinement 39Busfailuremanagement 44Bibliography 45CopyrightInternationalOrganizationforStandardization

?ISO2003—AllrightsreservedISO11898-1:2003(E)ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/IECDirectives,Part2.ThemaintaskoftechnicalcommitteesistoprepareInternationalStandards.DraftInternationalStandardsadoptedbythetechnicalcommitteesarecirculatedtothememberbodiesforvoting.PublicationasanInternationalStandardrequiresapprovalbyatleast75%ofthememberbodiescastingavote.Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocumentmaybethesubjectofpatentrights.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.ISO11898-1waspreparedbyTechnicalCommitteeISO/TC22,Roadvehicles,SubcommitteeSC3,Electricalandelectronicequipment.ThisfirsteditionofISO11898-1,togetherwithISO11898-2,replacesISO11898:1993,whichhasbeentechnicallyrevised.WhereasthereplacedInternationalStandardcoveredboththeCANDLLandthehigh-speedPL,ISO11898-1specifiestheDLL,includingLLCandMACsublayers,aswellasthePLSsublayer,whileISO11898-2specifiesthehigh-speedMAU.ISO11898consistsofthefollowingparts,underthegeneraltitleRoadvehicles—Controllerareanetwork(CAN):Part1:DatalinklayerandphysicalsignallingPart2:High-speedmediumaccessunitPart3:Low-speed,fault-tolerant,mediumdependentinterfacePart4:Time-triggeredcommunication?ISO2003—AllrCopyrightInternationalOrganizationforStandardizationightsreserved v?ISO2003—AllrProvidedbyIHSunderlicensewithISONoreproductionornetworkingpermittedwithoutlicensefromIHSProvidedbyIHSunderlicensewithISONoreproductionornetworkingpermittedwithoutlicensefromIHSSoldto:IHSStandardsStorePurchase,348409NotforResale,05/17/200611:48:43MDTCopyrightInternationalOrganizationforStandardizationINTERNATIONALSTANDARD ISO11898-1:2003(E)Roadvehicles—Controllerareanetwork(CAN)—Part1:DatalinklayerandphysicalsignallingScopeThispartofISO11898specifiesthedatalinklayer(DLL)andphysicalsignallingofthecontrollerareanetwork(CAN):aserialcommunicationprotocolthatsupportsdistributedreal-timecontrolandmultiplexingforusewithinroadvehicles.WhiledescribingthegeneralarchitectureofCANintermsofhierarchicallayersaccordingtotheISOreferencemodelforopensystemsinterconnection(OSI)establishedinISO/IEC7498-1,itprovidesthecharacteristicsforsettingupaninterchangeofdigitalinformationbetweenmodulesimplementingtheCANDLL—itselfspecifiedaccordingtoISO/IEC8802-2andISO/IEC8802-3—withdetailedspecificationofthelogicallinkcontrol(LLC)sublayerandmediumaccesscontrol(MAC)sublayer.ConformanceTheconformanceoftheDLLshallbetestedaccordingtoISO16845.NormativereferencesThefollowingreferenceddocumentsareindispensablefortheapplicationofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.ISO/IEC7498-1,Informationtechnology—OpenSystemsInterconnection—BasicReferenceModel:TheBasicModelISO/IEC8802-2,Informationtechnology—Telecommunicationsandinformationexchangebetweensystems—Localandmetropolitanareanetworks—Specificrequirements—Part2:LogicallinkcontrolISO/IEC8802-3,Informationtechnology—Telecommunicationsandinformationexchangebetweensystems—Localandmetropolitanareanetworks—Specificrequirements—Part3:Carriersensemultipleaccesswithcollisiondetection(CSMA/CD)accessmethodandphysicallayerspecificationsISO16845,Roadvehicles—Controllerareanetwork(CAN)—Conformancetestplan?ISO2003—AllrCopyrightInternationalOrganizationforStandardizationightsreserved 1?ISO2003—AllrProvidedbyIHSunderlicensewithISONoreproductionornetworkingpermittedwithoutlicensefromIHSSoldto:IHSStandardsStorePurchase,348409NotforResale,05/17/200611:48:43MDTProvidedbyIHSunderlicensewithISONoreproductionornetworkingpermittedwithoutlicensefromIHSSoldto:IHSStandardsStorePurchase,348409NotforResale,05/17/200611:48:43MDTISO11898-1:2003(E)TermsanddefinitionsForthepurposesofthisdocument,thefollowingtermsanddefinitionsapply.4.1bitratenumberofbitspertimeduringtransmission,independentofbitrepresentation4.2bitstuffingfillingusingbitstoprovidebusstatechangesrequiredforperiodicresynchronizationwhenusinganNRZbitrepresentationNOTEWheneverthetransmittinglogicencountersacertainnumber(stuffwidth)ofconsecutivebitsofequalvalueinthedata,itautomaticallystuffsabitofcomplementaryvalue—astuffbit—intotheoutgoingbitstream.Receiversdestufftheframe,i.e.theinverseprocedureiscarriedout.4.3bittimetBdurationofonebit4.4bustopologyofacommunicationnetwork,whereallnodesarereachedbypassivelinkswhichallowtransmissioninbothdirections4.5buscomparatordeviceconvertingphysicalsignalsusedfortransferacrossthecommunicationmediumbackintologicalinformationordatasignals4.6busdriverdeviceconvertinginformationordatasignalsintophysicalsignalssothatthesesignalscanbetransferredacrossthecommunicationmedium4.7busstateoneoftwocomplementarylogicalstates:dominantorrecessiveNOTEThedominantstaterepresentsthelogical0,andtherecessivestaterepresentsthelogical1.Duringsimultaneoustransmissionofdominantandrecessivebits,theresultingbusstateisdominant.Whennotransmissionisinprogress,thebusisidle.Duringthattimeitisintherecessivestate.4.8contention-basedarbitrationCSMAarbitrationprocedurewheresimultaneousaccessofmultiplenodesresultsinacontention4.9framedatalinkPDUspecifyingthearrangementandmeaningofbitsorbitfieldsinthesequenceoftransferacrossthetransmissionmedium4.10multicastaddressingwhereasingleframeisaddressedtoagroupofnodessimultaneouslyNOTE Broadcastisaspecialcaseofmulticast,wherebyasingleframeisaddressedtoallnodessimultaneously.CopyrightIternationalOrganizationforStandardization

?ISO2003—AllrightsreservedISO11898-1:2003(E)4.11multimastersystempartitionedintoseveralnodeswhereeverynodemaytemporarilycontroltheactionofothernodes4.12nodeassembly,linkedtoacommunicationnetwork,capableofcommunicatingacrossthenetworkaccordingtoacommunicationprotocolspecificationNOTE ACANnodeisanodecommunicatingacrossaCANnetwork.4.13non-return-to-zeroNRZmethodofrepresentingbinarysignals,i.e.withinoneandthesamebittimethesignalleveldoesnotchange,whereastreamofbitshavingthesamelogicalvalueprovidesnoedges4.14priorityattributetoaframecontrollingitsrankingduringarbitration,ahighpriorityincreasestheprobabilitythataframewinsthearbitrationprocess4.15protocolformalsetofconventionsorrulesfortheexchangeofinformationbetweennodes,includingthespecificationofframeadministration,frametransferandPL4.16receivernodewhenifitisnotatransmitterandthebusisnotidle4.17time-triggeredcommunicationoptionwhereaframecanbetransmittedataspecifictimeslot,alsoprovidingaglobalsynchronizationofclocksandallowingthedisablingoftheautomaticretransmissionofframes4.18transmitternodeoriginatingadataframeorremoteframe,whichstaystransmitteruntilthebusisidleagainoruntilthenodelosesarbitrationSymbolsandabbreviatedtermsACK acknowledgementBCH Bose-Chaudhuri-HocquenghemBR bitratetB bittimeCAN controllerareanetworkCRC cyclicredundancycheckCSMA carriersensemultipleaccessDLC datalengthcodeDLL datalinklayer?ISO2003—AllrCopyrightInternationalOrganizationforStandardizationightsreserved 3?ISO2003—AllrISO11898-1:2003(E)EOF endofframeFCE faultconfinemententityIC integratedcircuitIDE identifierextensionflagLAN localareanetworkLLC logicallinkcontrolLME layermanagemententityLPDU LLCprotocoldataunitLSB leastsignificantbitLSDU LLCservicedataunitMA mediumaccessMAC mediumaccesscontrolMAU mediumaccessunitMDI mediumdependentinterfaceMPDU MACprotocoldataunitMSB mostsignificantbitMSDU MACservicedataunitNRZ non-return-to-zeroOSI opensysteminterconnectionOVLD overloadPCI protocolcontrolinformationPDU protocoldataunitPL physicallayerPLS physicalsignallingPMA physicalmediumattachmentREC receiveerrorcounterRTR remotetransmissionrequestSDU servicedataunitSJW synchronizationjumpwidthSOF startofframeSRR substituteremoterequestTEC transmiterrorcounterTTC timetriggeredcommunicationCopyrightIternationalOrganizationforStandardization

?ISO2003—AllrightsreservedISO11898-1:2003(E)BasicconceptsofCANpropertiesCANshallhavethefollowingproperties:multi-masterpriority-basedbusaccess;non-destructivecontention-basedarbitration;multicastframetransferbyacceptancefiltering;remotedatarequest;configurationflexibility;system-widedataconsistency;errordetectionanderrorsignalling;automaticretransmissionofframesthathavelostarbitrationorhavebeendestroyedbyerrorsduringtransmission;distinctionbetweentemporaryerrorsandpermanentfailuresofnodesandautonomousswitching-offofdefectivenodes.FramesInformationonthebusshallbesentinfixedformatframesofdifferentbutlimitedlength.Whenthebusisidle,anyconnectednodemaystarttotransmitanewframe.BusaccessmethodWhenthebusisidle,anynodemaystarttotransmitaframe.Iftwoormorenodesstarttotransmitframesatthesametime,thebusaccessconflictshallberesolvedbycontention-basedarbitrationusingtheidentifier.Themechanismofarbitrationshallensurethatneitherinformationnortimeislost.Thetransmitterwiththeframeofhighestpriorityshallgainthebusaccess.InformationroutingInCANsystemsanodeshallnotmakeuseofanyinformationaboutthesystemconfiguration(e.g.nodeaddress).Instead,receiversacceptordonotacceptinformationbaseduponaprocesscalledframeacceptancefiltering,whichdecideswhetherthereceivedinformationisrelevantornot.Thereisnoneedforreceiverstoknowthetransmitteroftheinformationandviceversa.SystemflexibilityNodesmaybeaddedtotheCANnetworkwithoutrequiringanychangeinthesoftwareorhardwareofanynode,iftheaddednodeisnotthetransmitterofanydataframeandiftheaddednodedoesnotrequireanyadditionaltransmitteddata.DataconsistencyWithinCANaframeshallsimultaneouslybeacceptedeitherbyallnodesorbynone.Thusdataconsistencyshallbeapropertyofthesystemachievedbytheconceptsofmulticastandbyerrorhandling.?ISO2003—AllrCopyrightInternationalOrganizationforStandardizationightsreserved 5?ISO2003—AllrISO11898-1:2003(E)RemotedatarequestBysendingaremoteframe,anoderequiringdatamayrequestanothernodetosendthecorrespondingdataframe.Thedataframeandthecorrespondingremoteframeshallbenamedbythesameidentifier.ErrordetectionFordetectingerrors,thefollowingmeasuresshallbeprovided:monitoring(transmitterscomparethebitlevelstobetransmittedwiththebitlevelsdetectedonthebus);15-bitCRC;variablebitstuffingwithastuffwidthof5;framecheck;acknowledgecheck.ErrorsignallingandrecoverytimeCorruptedframesshallbeflaggedbyanytransmittingnodeandanynormallyoperating(error-active)receivingnode.Suchframesshallbeabortedandretransmittedaccordingtotheimplementedrecoveryprocedure(see8.3.4).Therecoverytimefromdetectinganerroruntilthepossiblestartofthenextframeshallbetypicallyseventeen(17)totwenty-three(23)bittimes[inthecaseofaheavilydisturbedbus,uptothirty-one(31)bittimes],iftherearenofurthererrors.ACKAllreceiversshallchecktheconsistencyofthereceivedframeandshallacknowledgeaconsistentframeandshallflaganinconsistentframe.Aframethatisnotacknowledgediscorruptedandshallbeflaggedbythetransmittingnode.AutomaticretransmissionFramesthathavelostarbitrationandframesthathavebeendisturbedbyerrorsduringtransmissionshallberetransmittedautomaticallywhenthebusisidleagain.Aframethatwillberetransmittedshallbehandledasanyotherframe,i.e.itparticipatesinthearbitrationprocesstogainbusaccess.IncaseofTTC,theautomaticretransmissionshallbedisabled(see9.2.5).FaultconfinementCANnodesshallbeabletodistinguishshortdisturbancesfrompermanentfailures.Defectivetransmittingnodesshallbeswitchedoff.Switchedoffmeansanodeislogicallydisconnectedfromthebus,sothatitcanneithersendnorreceiveanyframes(see).Error-activeAnerror-activenodeshallnormallytakepartinbuscommunicationandsendanactiveerrorflagwhenanerrorhasbeendetected.Theactiveerrorflagshallconsistofsix(6)consecutivedominantbitsandshallviolatetheruleofbitstuffingandallfixedformatsappearinginaregularframe(see).Error-passiveAnerror-passivenodeshallnotsendanactiveerrorflag.Ittakespartinbuscommunication,butwhenanerrorhasbeendetectedapassiveerrorflagshallbesent.Thepassiveerrorflagshallconsistofsix(6)CopyrightIternationalOrganizationforStandardization

?ISO2003—AllrightsreservedISO11898-1:2003(E)consecutiverecessivebits.Aftertransmission,anerror-passivenodeshallwaitsomeadditionaltimebeforeinitiatingafurthertransmission(seesuspendtransmissionin,and).Bus-offAnodeshallbeinthebus-offstatewhenitisswitchedofffromthebusduetoarequestofFCE.Inthebus-offstate,anodeshallneithersendnorreceiveanyframes.Anodeshallstarttherecoveryfrombus-offstateonlyuponauserrequest.LayeredarchitectureofCANReferencetoOSImodelAccordingtotheOSIreferencemodel,theCANarchitectureofthispartofISO11898shallrepresentthetwolayers,DLL,andPL.SeeFigure1.Figure1—LayeredarchitectureofCAN?ISO2003—AllrCopyrightInternationalOrganizationforStandardizationightsreserved 7?ISO2003—AllrISO11898-1:2003(E)AccordingtoISO/IEC8802-2andISO/IEC8802-3,theDLLhasbeensubdividedintoLLC,andMAC.ThePLhasbeensubdividedintoPLS,PMA,andMDI.TheMACsublayeroperationsshallbesupervisedbyanFCE.Faultconfinementshallbeaself-checkingmechanismthatdistinguishesshortdisturbancesfrompermanentfailures(forfaultconfinement,see13.1).ThePLmaybesupervisedbyanentitythatdetectsandmanagesfailuresofthephysicalmedium.ProtocolspecificationTwopeerprotocolentitiesshallcommunicatewitheachotherbyexchangingframesorPDUs.AnNPDUshallconsistofN-PCIand(N)-userdata.NPDUshallbepassedtoa(N1)-layerentityviaa(N1)-SAP.TheNPDUshallbepassedbymeansofthe(N1)-SDUtothe(N1)-layer,theservicesofwhichallowthetransferoftheNPDU.TheSDUshallbetheinterfacedatawhoseidentityispreservedbetween(N)-layerentities,i.e.itrepresentsthelogicaldataunittransferredbyaservice.TheDLLoftheCANprotocolshallnotprovideeitherthemeansformappingoneSDUintomultiplePDUsorformappingmultipleSDUsintoonePDU,i.e.anNPDUisdirectlyconstructedfromtheassociatedNSDUandthelayer-specificcontrolinformationN-PCI.Figure2illustratesthedatalinksublayerinteractions.Figure2—ProtocollayerinteractionsCopyrightIternationalOrganizationforStandardization

?ISO2003—AllrightsreservedISO11898-1:2003(E)FormatdescriptionofservicesFormatdescriptionofserviceprimitivesServiceprimitivesshallbewrittenasservice.type([parameter1,...])whereserviceindicatesthenameoftheservice,e.g.L_DatafordatatransferserviceprovidedbytheLLCsublayer,typeindicatesthetypeoftheserviceprimitives(see7.3.2),and[parameter1,...]isthelistofvaluespassedtotheserviceprimitives.Thesquarebracketsindicatethatthisparameterlistmaybeempty.TypesofserviceprimitivesServiceprimitivesshallbeofthreegenerictypes:Service.RequestTherequestprimitiveshallbepassedfromthe(N)-user(serviceuser)tothe(N)-layer(serviceprovider)torequestinitiationoftheservice.Service.IndicationTheindicationprimitiveshallbepassedfromthe(N)-layertothe(N)-usertoindicateaninternal(N)-layer(orsublayer)eventwhichissignificanttothe(N)-user.Thiseventmaybelogicallyrelatedtoaremoteservicerequest,ormaybecausedbyaneventinternaltothe(N)-layer(orsublayer).Service.ConfirmTheconfirmprimitiveshallbepassedfromthe(N)-layer(orsublayer)tothe(N)-usertoconveytheresultsofoneormoreassociatedpreviousservicerequest(s).Thisprimitivemayindicateeitherfailuretocomplyorsomelevelofcompliance.Itshallnotnecessarilyindicateanyactivityattheremotepeerinterface.LLCinterfaceTheLLCsublayershalloffertwotypesofconnectionlesstransmissionservicestotheLLCuser:unacknowledgeddatatransferservice;unacknowledgedremotedatarequestservice.Theinterfaceservicedatasentfromortotheusershallbeasin8.2.2.ThemessagessentbetweenLLCuserandLLCsublayershallbeasshownina)andb)ofTable1.TheLLCinterfacemessagessentfromandtothesupervisorFCEshallbeasin13.1.3.Table1—MessagesbetweenLLCuserandLLCsublayera)MessagesentfromLLCusertoLLCsublayerUsertoLLCmessageMeaningReset_RequestRequesttosetthenodeintoaninitialstateb)MessagessentfromLLCsublayertoLLCuserLLCtousermessageMeaningReset_ResponseResponsetotheReset_RequestNode_StatusIndicatesthecurrentstatusofthenode,i.e.itsignalswhetherornotthenodeisinthebus-offstate.?ISO2003—AllrCopyrightInternationalOrganizationforStandardizationightsreserved 9?ISO2003—AllrISO11898-1:2003(E)DescriptionofLLCsublayerGeneralTheLLCsublayerdescribestheupperpartoftheOSIDLL.Itisrelatedwiththoseprotocolissuesthatareindependentofthetypeofmediumaccessmethod.ServicesofLLCsublayerTypesofconnectionless-modetransmissionservicesTheLLCsublayershalloffertwotypesofconnectionless-modetransmissionservices:UnacknowledgeddatatransferserviceThisserviceshallprovidemeansbywhichLLCusersexchangeLSDUwithoutestablishingadata-linkconnection.Thedatatransfermaybepoint-to-point,multicastorbroadcast.UnacknowledgedremotedatarequestserviceThisserviceshallprovidemeansusedbyanLLCusertorequestaremotenodeforanLSDUtransmissionwithoutestablishingadata-linkconnection.Theremotenodeshallbasicallyservethedatarequestinthefollowingtwoways:Therequesteddatamaybepreparedbytheremoteuserfortransmission.InthiscasethedatashallbelocatedinaremotenodebufferandshallbetransmittedbytheremoteuserLLCentityuponreceptionoftheremoterequestframe.Therequesteddatashallbetransmittedbytheremoteuseruponreceptionoftheremoterequestframe.AccordingtothetwodifferentLLCservices,twotypesofframessentfromortotheusershallbeused:LLCdataframe;LLCremoteframe.TheLLCdataframeshallcarrydatafromatransmittertoareceiver.TheLLCremoteframeshallbetransmittedtorequesttransmissionofadataframe(withthesameidentifier)froma(single)remotenode.Inbothcases,theLLCsublayershallnotifythesuccessfultransmissionorreceptionofaframetotheuser.ServiceprimitivespecificationGeneralTheserviceprimitivespecificationofthissubclausedescribesindetailtheLLCserviceprimitivesandtheirassociatedparameters.ThecompletelistofLLCserviceprimitivesshallbeasgiveninTable2.CopyrightItenationalOrganizationforStandardization

?ISO2003—AllrightsreservedISO11898-1:2003(E)Table2—LLCserviceprimitivesoverviewUnacknowledgeddatatransferserviceL_Data.RequestRequestfordatatransferL_Data.IndicationIndicationofdatatransferL_Data.ConfirmConfirmdatatransferUnacknowledgedremotedatarequestserviceL_Remote.RequestRequestforremotedatarequestL_Remote.IndicationIndicationofremotedatarequestL_Remote.ConfirmConfirmationremotedatarequestTheparametersassociatedwiththedifferentLLCserviceprimitivesshallbeasgiveninTable3.Table3—ListofLLCserviceprimitiveparametersLLCserviceprimitiveparametersIdentifierIdentifiesthedataanditspriorityDLCDLCDataDatatheuserwantstotransmitTransfer_StatusConfirmationparameterL_Data.RequestFunctionTheL_Data.RequestprimitiveshallbepassedfromtheLLCusertotheLLCsublayertorequestthatanLSDUbesenttooneormoreremoteLLCentities.SemanticsofL_Data.RequestprimitiveTheprimitiveshallprovideparametersasfollowsL_Data.Request(IdentifierDLCData)TheparameterDatashallb