【英文标准名称】:Informationprocessingsystems-FibreDistributedDataInterface(FDDI)-Physicallayerprotocol(PHY-2)
【原文标准名称】:信息处理系统.光纤分布式数据接口(FDDI).物理层协议(PHY-2)
【标准号】:BSISO/IEC9314-7-1998
【标准状态】:现行
【国别】:英国
【发布日期】:1998-12-15
【实施或试行日期】:1998-12-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:信息交流;接口;编码(数据转换);语义学;光纤;物理层(开放系统互连);权标环网;数据链路层;纤维光缆;数据传输方法;协议;开放系统互连;数据传输;光纤分布数据接口(FIBERDISTRIBUTEDDATAINTERFACE);计算机网络;通信网;纤维光学;符号
【英文主题词】:Communicationprocedures;Controlprocedures;Datainterface;Dataprocessing;Datatransmission;Definition;Definitions;FDDI;Informationinterchange;Informationtechnology;Interfaces;Interfaces(dataprocessing);Networkinterconnection;Opticalfibres;Opticalwaveguides;Physicallayers;Protocols
【摘要】:ThispartofISO/IEC9314specifiesthePhysicalLayerProtocol(PHY),theuppersublayerofthePhysicalLayer,forFibreDistributedDataInterface(FDDI).FDDIprovidesahigh-bandwidth(100Mbit/s),general-purposeinterconnectionamonginformationprocessingsystems,subsystemsandperipheralequipment,usingfibreopticsorothertransmissionmedia.FDDIcanbeconfiguredtosupportasustaineddatatransferrateofatleast80Mbit/s(10Mbyte/s).FDDIprovidesconnectivityformanynodesdistributedoverdistancesofmanykilometersinextent.CertaindefaultparametervaluesforFDDI(e.g.timersettings)arecalculatedonthebasisofupto1000transmissionlinksorupto200kmtotalfibre-pathlength(typicallycorrespondingto500nodesand100kmofdualfibrecable,respectively);however,theFDDIprotocolscansupportmuchlargernetworksbyincreasingtheseparametervalues.Asshowninfigure1,FDDIconsistsofa)PhysicalLayer(PL),whichisdividedintotwosublayers:1)APhysicalMediumDependent(PMD),whichprovidesthedigitalbasebandpoint-to-pointcommunicationbetweennodesintheFDDInetwork.ThePMDprovidesallservicesnecessarytotransportasuitablycodeddigitalbitstreamfromnodetonode.ThePMDdefinesandcharacterizesthefibre-opticdriversandreceivers,medium-dependentcoderequirements,cables,connectors,powerbudgets,opticalbypassprovisions,andphysical-hardware-relatedcharacteristics.ItspecifiesthepointofinterconnectabilityforconformingFDDIattachments.TheinitialPMDstandarddefinesattachmenttomulti-modefibre.AlternativePMDsublayerstandardsarebeingdevelopedforattachmenttoothertransmissionmediaandformappingtoSynchronousOpticalNetwork(SONET),2)APhysicalLayerProtocol(PHY),whichprovidesconnectionbetweenthePMDandtheDataLinkLayer.PHYestablishesclocksynchronizationwiththeupstreamcode-bitdatastreamanddecodesthisincomingcode-bitstreamintoanequivalentsymbolstreamforusebythehigherlayers.PHYprovidesencodinganddecodingbetweendataandcontrolindicatorsymbolsandcodebits,mediumconditioningandinitializing,thesynchronizationofincomingandoutgoingcode-bitclocks,andthedelineationofoctetboundariesasrequiredforthetransmissionofinformationtoorfromhigherlayers.InformationtobetransmittedonthemediumisencodedbythePHYusingagrouptransmissioncode.ThedefinitionofPHYiscontainedinthispartofISO/IEC9314.b)ADataLinkLayer(DLL),whichisdividedintotwoormoresublayers:1)AnoptionalHybridRingControl(HRC),whichprovidesmultiplexingofpacketandcircuitswitcheddataonthesharedFDDImedium.HRCcomprisestwointernalcomponents,aHybridMultiplexer(H-MUX)andanIsochronousMAC(I-MAC).H-MUXmaintainsasynchronous125μscyclestructureandmultiplexesthepacketandcircuitswitcheddatastreams,andI-MACprovidesaccesstocircuitswitchedchannels,2)AMediaAccessControl(MAC),whichprovidesfairanddeterministicaccesstothemedium,addressrecognition,andgenerationandverificationofframechecksequences.Itsprimaryfunctionisthedeliveryofpacketdata,includingframegeneration,repetition,andremoval,3)AnoptionalLogicalLinkControl(LLC),whichprovidesacommonprotocolforanyrequiredpacketdataadaptationservicesbetweenMACandtheNetworkLayer.LLCisnotspecifiedbyFDDI,4)AnoptionalCircuitSwitchingMultiplexer(CS-MUX),whichprovidesacommonprotocolforanyrequiredcircuitdataadaptationservicesbetweenI-MACandtheNetworkLayer.CS-MUXisnotspecifiedbyFDDI.c)AStationManagement(SMT),whichprovidesthecoordinationnecessaryatthenodeleveltomanagetheprocessesunderwayinthevariousFDDIlayerssuchthatanodemayworkcooperativelyonaring.SMTprovidesservicessuchascontrolofconfigurationmanagement,faultisolatio
【中国标准分类号】:L65
【国际标准分类号】:33_180_01;35_110
【页数】:56P.;A4
【正文语种】:英语