ASTM E678-2007 技术数据的评估用标准实施规程

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【英文标准名称】:Cableddistributionsystemsfortelevisionandsoundsignals.Passivecoaxialwidebanddistributionequipment
【原文标准名称】:电视和声信号用电缆分布系统.第4部分:无源同轴宽带分布设备
【标准号】:BSEN50083-4-1995
【标准状态】:作废
【国别】:英国
【发布日期】:1995-04-15
【实施或试行日期】:1995-04-15
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:可视信号;电缆电视;电信系统;性能;功率损耗;电连接器;有线传输(电信);电子设备及元件;电视网;等级(质量);连接;视频信号;通信设备;电视系统;电信;声信号;广播网;技术文献;口述;通信网;公式
【英文主题词】:
【摘要】:
【中国标准分类号】:M31
【国际标准分类号】:33_060_40
【页数】:28P;A4
【正文语种】:英语


【英文标准名称】:Industrialcommunicationnetworks-Fieldbusspecifications-Part4-2:Data-linklayerprotocolspecification-Type2elements(IEC61158-4-2:2007);EnglishversionEN61158-4-2:2008,onlyonCD-ROM
【原文标准名称】:工业通讯网络.现场总线规范.第4-2部分:数据联络层协议规范.2型元件.仅为CD-ROM
【标准号】:DINEN61158-4-2-2008
【标准状态】:作废
【国别】:德国
【发布日期】:2008-09
【实施或试行日期】:2008-09-01
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:总线系统;总线;电路网络;通信;控制设备;控制系统;控制工艺学;数据通信;数据链层;数据连接系统;数据处理;数据设备;数据传送;定义;数字的;数字数据;数字工程;数字信号;电子数据处理;电气工程;电子仪器;电子系统;英语;现场总线;制导系统;工业的;工业设施;信息交换;信息处理;信息技术;接口;接口(数据处理);链路层;开放系统互连;OSI;过程控制;过程控制工程;过程控制系统;协议规范;协议;信号;规范;规范(验收);传输媒质;传输协议
【英文主题词】:Bussystems;Buses(dataprocessing);Circuitnetworks;Communication;Controlequipment;Controlsystems;Controltechnology;Datacommunication;Datalinklayers;Datalinksystem;Dataprocessing;Dataservices;Datatransfer;Definition;Definitions;Digital;Digitaldata;Digitalengineering;Digitalsignals;EDP;Electricalengineering;Electronicinstruments;Electronicsystems;Englishlanguage;Fieldbus;Guidancesystems;Industrial;Industrialfacilities;Informationinterchange;Informationprocessing;Informationtechnology;Interfaces;Interfaces(dataprocessing);Linklayers;Opensystemsinterconnection;OSI;Processcontrol;Processcontrolengineering;Processcontrolsystems;Protocolspecification;Protocols;Signals;Specification;Specification(approval);Transmissionmedia;Transmissionprotocol
【摘要】:1.1GeneralThedata-linklayerprovidesbasictime-criticalmessagingcommunicationsbetweendevicesinanautomationenvironment.Thisprotocolprovidescommunicationopportunitiestoallparticipatingdata-linkentities,sequentiallyandinacyclicsynchronousmanner.Foregroundscheduledaccessisavailablefortime-criticalactivitiestogetherwithbackgroundunscheduledaccessforlesscriticalactivities.Deterministicandsynchronizedtransferscanbeprovidedatcyclicintervalsupto1msanddeviceseparationsof25km.Thisperformanceisadjustabledynamicallyandon-linebyre-configuringtheparametersofthelocallinkwhilstnormaloperationcontinues.Bysimilarmeans,DLconnectionsandnewdevicesmaybeaddedorremovedduringnormaloperation.Thisprotocolprovidesmeanstomaintainclocksynchronizationacrossanextendedlinkwithaprecisionbetterthan10μs.ThisprotocoloptimizeseachaccessopportunitybyconcatenatingmultipleDLSDUsandassociatedDLPCIintoasingleDLPDU,therebyimprovingdatatransferefficiencyfordata-linkentitiesthatactivelysourcemultiplestreamsofdata.Themaximumsystemsizeisanunlimitednumberoflinksof99nodes,eachwith255DLSAPaddresses.Eachlinkhasamaximumof224relatedpeerandpublisherDLCEPs.1.2SpecificationsThisstandardspecifiesa)proceduresforthetimelytransferofdataandcontrolinformationfromonedata-linkuserentitytoapeeruserentity,andamongthedata-linkentitiesformingthedistributeddata-linkserviceprovider;b)thestructureofthefieldbusDLPDUsusedforthetransferofdataandcontrolinformationbytheprotocolofthisstandard,andtheirrepresentationasphysicalinterfacedataunits.1.3ProceduresTheproceduresaredefinedintermsofa)theinteractionsbetweenpeerDL-entities(DLEs)throughtheexchangeoffieldbusDLPDUs;b)theinteractionsbetweenaDL-service(DLS)providerandaDLS-userinthesamesystemthroughtheexchangeofDLSprimitives;c)theinteractionsbetweenaDLS-providerandaPh-serviceproviderinthesamesystemthroughtheexchangeofPh-serviceprimitives.1.4ApplicabilityTheseproceduresareapplicabletoinstancesofcommunicationbetweensystemswhichsupporttime-criticalcommunicationsserviceswithinthedata-linklayeroftheOSIorfieldbusreferencemodels,andwhichrequiretheabilitytointerconnectinanopensystemsinterconnectionenvironment.Profilesprovideasimplemulti-attributemeansofsummarizinganimplementation’scapabilities,andthusitsapplicabilitytovarioustime-criticalcommunicationsneeds.1.5ConformanceThisstandardalsospecifiesconformancerequirementsforsystemsimplementingtheseprocedures.Thisstandarddoesnotcontainteststodemonstratecompliancewithsuchrequirements.
【中国标准分类号】:N18;P76
【国际标准分类号】:35_100_20;35_160;35_240_50
【页数】:229P.;A4
【正文语种】:英语