【英文标准名称】:WirelessFeaturesDescription:MobileAccessHunting(MAH)
【原文标准名称】:无线电通信特征:移动存取搜索(MAH)
【标准号】:ANSI/TIA-664-514-B-2007
【标准状态】:现行
【国别】:美国
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:移动无线电通信系统;无线电工程;电信
【英文主题词】:Features;Mobileradiosystems;Radioengineering;Telecommunications;Wireless
【摘要】:MobileAccessHunting(MAH)causesacalltoaPilotDirectoryNumbertosearchalistofterminationaddressessequentiallyforonethatisidleandabletobealerted.Ifaparticularterminationaddressisbusy,inactive,failstorespondtoapagingrequest,ordoesnotansweralertingbeforeatime-out,thenthenextterminationaddressinthelististried.Onlyoneterminationaddressisalertedatatime.Themobiletelephonesinthegroupmaybealertedusingdistinctivealerting.AdditionalcallsmaybedeliveredtotheMAHPilotDirectoryNumberatanytime.
【中国标准分类号】:M19
【国际标准分类号】:33_070_50
【页数】:
【正文语种】:英语
基本信息
| 标准名称： | 道路交通阻塞度及评价方法 |
| 中标分类： |
公路、水路运输 >>
交通管理 >>
交通秩序管理 |
| 发布部门： | 中华人民共和国公安部 |
| 发布日期： | 1995-08-17 |
| 实施日期： | 1996-01-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 4 |
适用范围
本标准规定了道路交通中的机动车周期性阻塞的评定指标和测定方法。本标准适用于公安交通管理部门对道路交通阻塞程序的评价。
前言
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目录
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引用标准
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所属分类： 公路 水路运输 交通管理 交通秩序管理
【英文标准名称】:Industrialcommunicationnetworks.Fieldbusspecifications.Data-linklayerprotocolspecification.Type18elements
【原文标准名称】:工业通讯网络.现场总线规范.数据链路层协议规范.18型元件
【标准号】:BSEN61158-4-18-2008
【标准状态】:作废
【国别】:英国
【发布日期】:2008-05-30
【实施或试行日期】:2008-05-30
【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】: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;数据链路层;数据连接系统;数据处理;数据服务;数据传送;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;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(数据处理);链路层;开放系统互连;物理层;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】:Automaticcontrolsystems;Busnetworks;Bussystems;Buses(dataprocessing);Circuitnetworks;Communication;Communicationnetworks;Communicationprocedures;Computernetworks;Controlequipment;Controlsystems;Controltechnology;Datacommunication;Datalinklayer(OSI);Datalinklayers;Datalinksystem;Dataprocessing;Dataservices;Datatransfer;Datatransmission;Definitions;Digital;Digitaldata;Digitalengineering;Digitalsignals;EDP;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-linkentitiesa)inasynchronously-startingcyclicmanner,accordingtoapre-establishedschedule,andb)inacyclicoracyclicasynchronousmanner,asrequestedeachcyclebyeachofthosedata-linkentities.Thusthisprotocolcanbecharacterizedasonewhichprovidescyclicandacyclicaccessasynchronouslybutwithasynchronousrestartofeachcycle.1.2SpecificationsThispartofIEC61158specifiesa)proceduresforthetimelytransferofdataandcontrolinformationfromonedata-linkuserentitytoapeeruserentity,andamongthedata-linkentitiesformingthedistributeddatalinkserviceprovider;b)proceduresforgivingcommunicationsopportunitiestoallparticipatingDL-entities,sequentiallyandinacyclicmannerfordeterministicandsynchronizedtransferatcyclicintervalsuptoonemillisecond;c)proceduresforgivingcommunicationopportunitiesavailablefortime-criticaldatatransmissiontogetherwithnon-time-criticaldatatransmissionwithoutprejudicetothetime-criticaldatatransmission;d)proceduresforgivingcyclicandacycliccommunicationopportunitiesfortime-criticaldatatransmissionwithprioritizedaccess;e)proceduresforgivingcommunicationopportunitiesbasedonstandardISO/IEC8802-3mediumaccesscontrol,withprovisionsfornodestobeaddedorremovedduringnormaloperation;f)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.1.5ConformanceThispartofIEC61158doesnotspecifyindividualimplementationsorproducts,nordotheyconstraintheimplementationsofdata-linkentitieswithinindustrialautomationsystems.Thereisnoconformanceofequipmenttothisdata-linklayerservicedefinitionstandard.Instead,conformanceisachievedthroughimplementationofthecorrespondingdata-linkprotocolthatfulfillstheType18data-linklayerservicesdefinedinthisstandard.
【中国标准分类号】:N17
【国际标准分类号】:25_040_40;35_100_20;35_160;35_240_50
【页数】:40P.;A4
【正文语种】:英语