ISO/IEC 8802-5-1998 信息技术系统间远程通信和信息交换局域网和城域网特殊要求第5部分:令牌环访问方法和物理层规范

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【英文标准名称】:Informationtechnology-Telecommunicationsandinformationexchangebetweensystems-Localandmetropolitanareanetworks-Specificrequirements-Part5:Tokenringaccessmethodandphysicallayerspecifications
【原文标准名称】:信息技术系统间远程通信和信息交换局域网和城域网特殊要求第5部分:令牌环访问方法和物理层规范
【标准号】:ISO/IEC8802-5-1998
【标准状态】:现行
【国别】:国际
【发布日期】:1998-09
【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】:网络互连;局域网;信息技术;人类;局部地区网络;电信;媒体通路控制;城域网;定义;标志环;信息交换;物理层;数据处理;多路存取计算机
【英文主题词】:Dataprocessing;Definition;Definitions;Informationinterchange;Informationtechnology;LAN;Localareanetworks;MAC;MAN;Mediumaccesscontrol;Metropolitanareanetworks;Networkinterconnection;Physicallayers;Telecommunications;Tokenring
【摘要】:Forthepurposeofcompatibleinterconnectionofdataprocessingequipmentviaalocalareanetwork(LAN)usingthetokenringaccessmethod,thispartofISO/IEC8802a)Providesageneraldescriptionofthetokenringlocalareanetwork(LAN)architecture(clause2);b)Definestheframeformat,includingthedelimiters,addressfields,informationfield,andframe-checksequence(FCS).DefinestheMediumAccessControl(MAC)frames,timers,anderrorcounters(clause3);c)DefinestheMACprotocolsincludingfinitestatemachinesandstatetables(clause4);d)DefinesthesystemlevelPhysicallayer(PHY)signalingspecificationsthatarespecifictoaringstation(clause5);e)Definesthemanagedobjectsnecessarytomanagetheserviceandprotocolelementsthatarein-volvedinthemanagementofatokenringstation(clause6);f)DefinesthePHYstationattachmentspecificationfor4and16Mbit/soperation.Thisincludesthetransmitter,receiver,mediuminterfaceconnector,andtransmissionchannelforbothshieldedtwistedpair(STP)andunshieldedtwistedpair(UTP)media(clause7);g)Definestheconcentrator,incorporatingmultipletrunkcouplingunits(TCUs),fortheattachmentofagroupofstationstothering(clause8);h)Includestheprotocolimplementationconformancestatement(PICS)proformaincompliancewiththerelevantrequirements,andinaccordancewiththerelevantguidance,giveninISO/IEC9646-2:1994(annexA);i)Includeschanneldesignexamplesandformulasforcalculatingcablingandconcentratorsystemconfigurations(annexB);j)Describesjittercomponentsandprovidesanexampleofjitterbuildupusingaphaselocklooprecoverycircuit(annexC);k)Providesinformativetransmitterfilterdesignexample(annexD);1)Providesrecommendedguidelinesforsafetyandoperatingenvironments(annexE);m)IllustratestheMACfinitestatemachinesinanotationsimilartothatusedinISO/IEC8802-5:1992(annexF);n)Describesmajorimprovementsmadeafterthefirsteditionofthestandard(annexG);o)ProvidesasamplealgorithmfortheparsingofMACframes(annexH);p)Providesrecommendationsfortheuseoftokenringaccessprioritiestosupportmultimediatraffic(annexI);q)Providesbiterrorrate(BER)criteriaforlobemediatesting(annexP).Aparticularemphasisofthisstandardistospecifytheexternallyvisiblecharacteristicsneededforinterconnectioncompatibility,whileavoidingunnecessaryconstraintsuponandchangestointernaldesignandimplementationoftheheterogeneousprocessingequipmenttobeinterconnected.TheapplicationsenvironmentfortheLANisintendedtobecommercialandlightindustrial.TheuseoftokenringLANsinhomeandheavyindustrialenvironments,whilenotprecluded,hasnotbeenconsideredinthedevelopmentofthisstandard.Thisstandard,theThirdEditionofthispartofISO/IEC8802,providesenhancementsandcorrectionstotheSecondEdition.TheSecondEditionprovidedgreaterspecificityandimprovedclaritytotheFirstEdition(1992-06-12)toensureinteroperabilityofthevariouscomponentsinthetokenringnetwork.Theintentofthiseditionistomaintaininteroperabilitywithstationsdesignedtothisspecificationandstationsdesignedtoprioreditionsofthestandard.However,interoperabilitywithpriorimplementations(particularlyinregardtoclause7)cannotbeguaranteedduetononspecificitywithinthe1992edition.AnnexGliststhespecificdifferencesbetweenthesecondeditionandthefirstedition.Thefollowingitemsaresubjectsforfuturestudy:a)Controlledbitalteringbyanydeviceexceptastation.b)Methodologytoassurehandlingofjoiningofmultipleringsasmaybeusedbymanagedconcen-tratorstoassurenormalinsertionprocessprotectionmechanisms(suchasduplicateaddresstestorringparameterservernotification).c)Ri
【中国标准分类号】:L78
【国际标准分类号】:35_100_10;35_110
【页数】:243P;A4
【正文语种】:英语