NF L31-557-2002 航空航天系列.室温条件下高负荷、宽系列、带自动润滑轴承衬的耐蚀钢制关节轴承.尺寸和负载
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【英文标准名称】:Aerospaceseries-Bearing,sphericalplainincorrosionresistingsteelwithself-lubricatingliner-Wideseries-Elevatedloadatambienttemperature-Dimensionsandloads.
【原文标准名称】:航空航天系列.室温条件下高负荷、宽系列、带自动润滑轴承衬的耐蚀钢制关节轴承.尺寸和负载
【标准号】:NFL31-557-2002
【标准状态】:现行
【国别】:法国
【发布日期】:2002-09-01
【实施或试行日期】:2002-09-20
【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】:钢;飞机机架轴承;尺寸;公差(测量);重型;环境温度;宽的;关节轴承;航空运输;材料;覆层;耐腐蚀钢;作标记;航空航天运输;飞行器;规范(验收);自润滑;航天运输;表面处理;轴承;负荷
【英文主题词】:
【摘要】:
【中国标准分类号】:V22
【国际标准分类号】:49_035
【页数】:9P;A4
【正文语种】:其他
基本信息
| 标准名称： | 运输船舶状态代码 |
| 中标分类： |
公路、水路运输 >>
公路、水路运输综合 >>
电子计算机应用 |
| 发布日期： | |
| 实施日期： | 1985-10-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 9页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 公路 水路运输 公路 水路运输综合 电子计算机应用
【英文标准名称】:Informationtechnology-FibreDistributedDataInterface(FDDI)-Part7:Physicallayerprotocol(PHY-2)
【原文标准名称】:信息技术光纤分布式数据接口(FDDI)第7部分:物理层协议
【标准号】:ISO/IEC9314-7-1998
【标准状态】:现行
【国别】:国际
【发布日期】:1998-08
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/IECJTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:通信规程;数据处理;物理层;协议;光波导;信息交换;数据传输;定义;控制规程;数据接口;光学纤维;界面;信息技术;光纤分布数据接口(FIBERDISTRIBUTEDDATAINTERFACE);接口;网络互连
【英文主题词】:
【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,faultisolationandrec
【中国标准分类号】:L78
【国际标准分类号】:33_180_01;35_110
【页数】:50P;A4
【正文语种】:英语
