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MIL-PRF-81542B, PERFORMANCE SPECIFICATION, LIFE RAFT, INFLATABLE, SINGLE-PLACE (5 FEB 2007) [SUPERSEDING MIL-L-81542A(AS)]., This specification covers the requirements for an inflatable one-man, single place life raft.【英文标准名称】:Informationtechnology-Datacommunications-X.25PacketLayerProtocolforDataTerminalEquipment
【原文标准名称】:信息技术数据通信数据终端设备用X25包级协议
【标准号】:ISO/IEC8208-2000
【标准状态】:现行
【国别】:国际
【发布日期】:2000-11
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:通信规程;数据传送;网络层;计算机终端;数据处理;数据终端;包交换网络;网络互连;数据通信;信息交换;信息技术
【英文主题词】:Communicationprocedures;Computerterminals;Datacommunication;Dataprocessing;Dataterminals;Datatransfer;Informationinterchange;Informationtechnology;Networkinterconnection;Networklayers;Packetswitchingnetworks
【摘要】:ThisInternationalStandardspecifiestheprocedures,formatsandfacilitiesatthePacketLayerforDataTerminalEquipment(DTE)operatinginconformancewithITU-TRecommendationX.25.BothVirtualCallandPermanentVirtualCircuitmodesofoperationarecovered.ThePacketLayerprotocolspecifiedhereincanbeusedinbothOpenSystemsInterconnection(OSI)andnon-OSIenvironments.WhenusedwithinthecontextofOSI,thePacketLayerprotocolisencompassedintheNetworkLayeroftheOSIReferenceModel,ITU-TRec.X.200IISO/IEC7498-1.ThisInternationalStandardcoversDTEoperationatthePacketLayerwhenaccessingapublicorprivatepacket-switchednetworkconformingtoITU-TRecommendationX.25bymeansofadedicatedpathoracircuit-switchedconnection.ItalsocoverstheadditionalPacketLayerproceduresnecessaryfortwoDTEsconformingtothisInternationalStandardtocommunicatedirectly(i.e.,withoutaninterveningpacket-switchednetwork)overadedicatedpath,acircuit-switchedconnection,oralocalareanetwork(LAN).ThisInternationalStandardalsocoversprivatenetworksthatuseITU-TRecommendationX.25toconnecttopacket-switchedpublicdatanetworksandthatmayalsoofferanX.25interfacetoaDTE(seeannexA).Toevaluateconformanceofaparticularimplementation,itisnecessarytohaveastatementofwhichcapabilitiesandoptionshavebeenimplemented.SuchastatementiscalledaProtocolImplementationConformanceStatement(PICS),asdefinedinITU-TRec.X.290|ISO/IEC9646-1.AnnexBprovidesthePICSproformainaccordancewiththerelevantguidancegiveninITU-TRec.X.296|ISO/IEC9646-7.ThefirsteditionofthisInternationalStandardwasbasedonthe1984CCITTRedBooktextofRecommendationX.25.Italsocontainedthenecessaryprovisionsforcompatibilitywiththeearlier1980CCITTYellowBooktextofRecommendationX.25.Thesecondeditionwasbasedonthe1988CCITTBlueBooktextofRecommendationX.25.Thethirdeditionisbaseduponthe1993versionofX.25.Thisfourtheditionisbasedonthe1996versionofX.25.Retainedwithinthisfourtheditionarethenecessaryprovisionsforcompatibilitywiththe1993,1988,1984and1980versionsofX.25.ThedifferencesbetweenvariouseditionsofthisInternationalStandardaresummarizedinannexC.ItshouldbenotedthatthisInternationalStandardandITU-TRecommendationX.25asitappliestoDTEsaredifferentinscope.ThisInternationalStandardcontainsthespecificationsthatITU-TRecommendationX.25placesonDTEs.Inaddition,thisInternationalStandardcontainsaddedspecificationstofacilitateinterworkingbetweenDTEsandtocoverdirectDTE-to-DTEoperation.ThisbroaderscopehastoberecognizedintheapplicationofthisInternationalStandard.
【中国标准分类号】:L78
【国际标准分类号】:35_100_30
【页数】:170P;A4
【正文语种】:英语