NF C93-902-12-2006 光纤互联装置和无源元件.基本试验和测量程序.第2-12部分:试验.冲击

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【英文标准名称】:Informationtechnology-Frameworkforprotocolidentificationandencapsulation
【原文标准名称】:信息技术.识别和封闭协议构架
【标准号】:BSISO/IEC14765-1997
【标准状态】:现行
【国别】:英国
【发布日期】:1997-12-15
【实施或试行日期】:1997-12-15
【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】:数据处理;协议;信息交流;电信;数据链路层;数据传送;识别方法;灌封式的;网络互连;开放系统互连
【英文主题词】:Datalinklayers;Dataprocessing;Definitions;Identificationmethod;Informationinterchange;Informationtechnology;Networkinterconnection;OSI;Protocols;Telecommunications
【摘要】:Inalayeredapproachtoprotocolarchitecture,protocolshavearelationshiptooneanothersuchthataprotocolatlayer(n)usestheservicesofthelayerbelowit-the(n-1)services-which,inturn,areprovidedbyalayer(n-1)protocol.Oneoftheservicesusedbyalayer(n)protocolistheencapsulationofits(n)ProtocolDataUnits(PDUs)inawaywhichistransparenttoit.Suchencapsulationisrealizedbythecarriageofthe(n)PDUsasuserdatainan(n-1)ServiceDataUnit(SDU).Inalimitedcase,theoperationofaparticularprotocolatlayer(n-1)impliestheoperation,abovelayer(n-1),ofasinglelayer(n)protocolorsinglesetofrelated(n)/(n+1)...protocols.However,inamoregeneralcase,theremaybemorethanoneprotocol(orsetofrelatedprotocolsstarting)atlayer(n)thatcanoperateabovelayer(n-1)inagivenenvironment.Insuchcases,thereisaneedforexplicitidentificationoftheprotocol(orsetofprotocolsstarting)atlayer(n).Therealsomaybeaneedtomanipulatethe(n-1)protocol(i.e.theencapsulatingprotocol)incertainwaysspecifictothelayer(n)protocol(i.e.theencapsulatedprotocol).Suchmanipulationsformthebasisofasetofproceduresthatmustbespecifiedforthelayer(n)protocol.Theaboveobservationsregardingprotocolidentificationandencapsulationarealsoapplicableincaseswherean(n)layerisfurtherdividedintosublayers.Casesinwhichan(n)protocoloperatesforthepurposeofestablishingaparalleluniverseofprotocols(regardlessofthelayeredstructureofthatuniverse)alsogiverisetoaneedforthe(n)protocoltobeabletoidentifytheprotocol(s)intheparalleluniverse.Inthesecases,however,thereisnoencapsulating/encapsulatedrelationshipbetweenthe(n)protocolandtheparalleluniversesetofprotocols.Theaboveprinciplesleadtoaneedtoestablishaframeworkforprotocolidentificationandencapsulation.Theseprinciplesapplytotherelationshipbetweentwoprotocols(recognizingthatoneofthemmaybeasetofrelatedprotocols)andcanbeappliedrecursively.ThisRecommendation|InternationalStandardprovidesaframeworkforexplicitprotocolidentificationandforprotocolencapsulation.Implicitprotocolidentification(see4.2)isbeyondthescopeofthisRecommendation|InternationalStandard.
【中国标准分类号】:L79
【国际标准分类号】:35_100_01
【页数】:26P.;A4
【正文语种】:英语


【英文标准名称】:Measurementoftheelectricalpropertiesofelectronictubesandvalves;methodsofmeasuringnoisefactor
【原文标准名称】:电子管电气性能测试.第6部分:噪声系数的测量方法
【标准号】:DIN44402-6-1972
【标准状态】:现行
【国别】:德国
【发布日期】:1972-03
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:电气工程;电子工程;温度;定义;特性;测量技术;电子管;测量
【英文主题词】:temperature;measurement;definitions;electronictubes;electricalengineering;electrontubes;measuringtechniques;properties;electronicengineering
【摘要】:Measurementoftheelectricalpropertiesofelectronictubesandvalves;methodsofmeasuringnoisefactorDieseNormstimmtsachlichübereinmitderIEC-Empfehlung151-4,Ausgabe1963.Measurementsoftheelectricalpropertiesofelectronictubesandval
【中国标准分类号】:L35
【国际标准分类号】:31_100
【页数】:3P;A4
【正文语种】:德语