标准资料网-标准资料免费资源平台

【英文标准名称】:Informationtechnology-Telecommunicationsandinformationexchangebetweensystems-High-leveldatalinkcontrol(HDLC)procedures
【原文标准名称】:信息技术.系统间远程通信和信息交换.高级数据链路控制(HDLC)规程
【标准号】:ISO/IEC13239-2002
【标准状态】:现行
【国别】:国际
【发布日期】:2002-07
【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】:控制规程;高级数据链路控制规程;数据链层;信息技术;开放系统互连;信息交换;数据传送;数据处理;电信;定义
【英文主题词】:Controlprocedures;Datalinklayers;Dataprocessing;Datatransfer;Definitions;High-leveldatalinkcontrol;Informationinterchange;Informationtechnology;OSI;Telecommunications
【摘要】:ThisInternationalStandardspecifiestheframestructures,theelementsofprocedures,theclassesofprocedures,thecontentandformatofthegeneralpurposeExchangeIdentification(XID)frame,andameansforresolution/negotiationofadatalinklayeraddressinswitchedenvironmentsfordatacommunicationsystemsusingbit-orientedhigh-leveldatalinkcontrol(HDLC)procedures.NOTE—Theuseofthephrase"bit-oriented",referringtotheHDLCcontrolprocedures,pertainstotheallocationofanon-integralnumberofbitstovarioussubfieldsusedforHDLCcontrolpurposes.However,theframeasanentiretymaybeconstructedfromoctet-orientedunits(e.g.,start-stopmode)fortransmissionpurposes.Theframestructureportiondefinestherelativepositionsofthevariouscomponentsofthebasicframeformatandthenon-basicframeformat.Themechanismsusedtoachievebitpatternindependence(transparency),whereandwhenrequired,withintheframearealsodefined.Inaddition,threeframecheckingsequences(FCS)arespecified;therulesforaddressfieldextensionaredefined;andtheaddressingconventionsavailablearedescribed.Theelementsofproceduresportionspecifieselementsofdatalinkcontrolproceduresforsynchronousorstart/stop,code-transparentdatatransmissionusingindependentframenumberinginbothdirections.TheseHDLCelementsofproceduresaredefinedspecificallyintermsoftheactionsthatoccuronreceiptofcommandsatasecondarystation,atributarystation,apeerstation,oracombinedstation.ThisInternationalStandardisintendedtocoverawiderangeofapplications;forexampleone-way,two-wayalternateortwo-waysimultaneousdatacommunicationbetweendatastationswhichareusuallybuffered,includingoperationsondifferenttypesofdatacircuits;forexamplemultipoint/point-to-point,duplex/half-duplex,switched/non-switched,synchronous/start-stop,etc.Thedefinedelementsofproceduresaretobeconsideredasacommonbasisforestablishingdifferenttypesofdatalinkcontrolprocedures.ThisInternationalStandarddoesnotdefineanysinglesystemandshouldnotberegardedasaspecificationforadatacommunicationsystem.Notallofthecommandsorresponsesarerequiredforanyparticularsystemimplementation.TheclassesofproceduresportiondescribestheHDLCunbalancedclassesofprocedures,theHDLCbalancedclassofprocedures,andtheHDLCconnectionlessclassesofproceduresforsynchronousorstart/stopdatatransmission.Fortheunbalancedclasses,thedatalinkconsistsofaprimarystationplusoneormoresecondarystationsandoperatesineitherthenormalresponsemodeortheasynchronousresponsemodeinapoint-to-pointormultipointconfiguration.Forthebalancedclass,thedatalinkconsistsoftwocombinedstationsandoperatesintheasynchronousbalancedmodeinapoint-to-pointconfiguration.Fortheunbalancedconnectionlessclass,thedatalinkconsistsofacontrolstationplusoneormoretributarystationsandoperatesintheunbalancedconnectionless-modeinapoint-to-pointormultipointconfiguration.Forthebalancedconnectionlessclass,thedatalinkconsistsoftwopeerstationsandoperatesinthebalancedconnectionless-modeinapoint-to-pointconfiguration.Ineachclass,abasicrepertoireofcommandsandresponsesisdefined,butthecapabilityofthedatalinkmaybemodifiedbytheuseofoptionalfunctions.Balancedoperationisintendedforuseincircumstanceswhichrequireequalcontrolateitherendofthedatalink.OperationalrequirementsarecoveredinaccordancewiththeoverallHDLCarchitecture.ThecontentandformatoftheExchangeIdentification(XID)frameportionbuildsonthefactthattheprincipaluseoftheXIDframeistoexchangedatalinkinformationbetweentwoormoreHDLCstations.ForthepurposeofthisInternationalStandard,datalinkinformationshallincludeanyandallesse
【中国标准分类号】:L79
【国际标准分类号】:35_100_20
【页数】:128P;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforOperatingPerformanceofAnion-ExchangeMaterialsforStrongAcidRemoval
【原文标准名称】:清除强酸用阴离子交换材料使用性能的标准试验方法
【标准号】:ASTMD3087-1991
【标准状态】:现行
【国别】:美国
【发布日期】:1991
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:水;试验;操作;酸
【英文主题词】:water;testing;operation;acids
【摘要】:
【中国标准分类号】:G17
【国际标准分类号】:71_100_40
【页数】:4P;A4
【正文语种】:英语