【英文标准名称】:Conditionmonitoringanddiagnosticsofmachines-Vibrationconditionmonitoring-Part2:processing,analysisandpresentationofvibrationdata.
【原文标准名称】:机器的工况监测和诊断.振动条件监测.第2部分:振动数据的处理、分析和表示
【标准号】:NFE90-373-2-2006
【标准状态】:现行
【国别】:法国
【发布日期】:2006-04-01
【实施或试行日期】:2006-04-20
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:声学;模拟;分析方法;条件控制;条件试验;数据表示;诊断;诊断系统;数字的;解释;机械振动;机器;测量;机械工程;监控;处理;额定值;编写;表示法;信号强度;监督(认可);试验;振动;振动工程;振动测量;振动试验
【英文主题词】:
【摘要】:
【中国标准分类号】:J04
【国际标准分类号】:17_160
【页数】:41P;A4
【正文语种】:其他


【英文标准名称】:Informationprocessingsystems-FibreDistributedDataInterface(FDDI)-Mediaaccesscontrol-2(MAC-2)
【原文标准名称】:信息处理系统.光纤分布式数据接口(FDDI).介质存取控制-2(MAC-2)
【标准号】:BSISO/IEC9314-8-1998
【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】:纤维光学;数据传输方法;光纤分布数据接口(FIBERDISTRIBUTEDDATAINTERFACE);数据传输;开放系统互连;计算机网络;地址(数据处理);纤维光缆;语义学;信息交流;接口;权标环网;数据链路层;物理层(开放系统互连);光纤
【英文主题词】:Communicationprocedures;Controlprocedures;Datainterface;Dataprocessing;Datatransmission;Definition;Definitions;FDDI;Informationinterchange;Informationtechnology;Interfaces;Interfaces(dataprocessing);MAC;Networkinterconnection;Opticalfibres;Opticalwaveguides;Tokenring
【摘要】:ThispartofISO/IEC9314specifiestheMediaAccessControl(MAC),themiddlesublayeroftheDataLinkLayer(DLL),forFibreDistributedDataInterface(FDDI).FDDI(ISO/IEC9314)providesahigh-bandwidth(100Mbit/s),general-purposeinterconnectionamonginformationprocessingsystems,subsystemsandperipheralequipment,usingfibreopticsorothertransmissionmedia.FDDIcanbeconfiguredtosupportasustaineddatatransferrateofatleast80Mbit/s(10Mbyte/s).FDDIprovidesconnectivityformanynodesdistributedoverdistancesofmanykilometresinextent.CertaindefaultparametervaluesforFDDI(e.g.timersettings)arecalculatedonthebasisofupto1000transmissionlinksorupto200kmtotalfibrepathlength(typicallycorrespondingto500nodesand100kmofdualfibrecable,respectively);however,theFDDIprotocolscansupportmuchlargernetworksbyincreasingtheseparametervalues.Asshowninfigure1,ISO/IEC9314consistsofa)APhysicalLayer(PL),whichisdividedintotwosublayers:1)APhysicalMediumDependent(PMD),whichprovidesthedigitalbasebandpoint-to-pointcommunicationbetweennodesintheFDDInetwork.ThePMDprovidesallservicesnecessarytotransportasuitablycodeddigitalbitstreamfromnodetonode.ThePMDdefinesandcharacterizesthefibre-opticdriversandreceivers,medium-dependentcoderequirements,cables,connectors,powerbudgets,opticalbypassprovisions,andphysical-hardware-relatedcharacteristics.ItspecifiesthepointofinterconnectabilityforconformingFDDIattachments.TheinitialPMDstandard,ISO/IEC9314-3,definesattachmenttomulti-modefibre.AdditionalPMDsublayerstandardsarebeingdevelopedforattachmenttosingle-modefibreandSONET.2)APhysicalLayerProtocol(PHY),whichprovidesconnectionbetweenthePMDandtheDataLinkLayer.PHYestablishesclocksynchronizationwiththeupstreamcode-bitdatastreamanddecodesthisincomingcode-bitstreamintoanequivalentsymbolstreamforusebythehigherlayers.PHYprovidesencodinganddecodingbetweendataandcontrolindicatorsymbolsandcodebits,mediumconditioningandinitializing,thesynchronizationofincomingandoutgoingcode-bitclocks,andthedelineationofoctetboundariesasrequiredforthetransmissionofinformationtoorfromhigherlayers.InformationtobetransmittedonthemediumisencodedbythePHYusingagrouptransmissioncode.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.ThedefinitionofMACiscontainedinthispartoflSO/IEC9314.3)AnoptionalLogicalLinkControl(LLC),whichprovidesacommonprotocolforanyrequiredpacketdataadaptationservicesbetweenMACandtheNetworkLayer.LLCisnotspecifiedbyFDDI.4)AnoptionalCircuitSwitchingMultiplexer(CS-MUX),whichprovidesacommonprotocolforanyrequiredcircuitdataadaptationservicesbetweenI-MACandtheNetworkLayer.CS-MUXisnotspecifiedbyFDDI.c)AStationManagement(SMT),whichprovidesthecontrolnecessaryatthenodeleveltomanagetheprocessesunderwayinthevariousFDDIlayerssuchthatanodemayworkcooperativelyonaring.SMTprovidesservicessuchascontrolofconfigurationmanagement,faultisolationandrecovery,a
【中国标准分类号】:L65
【国际标准分类号】:33_180_01;35_110
【页数】:108P.;A4
【正文语种】:英语