BS ISO/IEC 9594-1-1995 信息技术.开式式系统互连.概念、模型和服务综述

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【英文标准名称】:Informationtechnology-Opensystemsinterconnection-Overviewofconcepts,modelsandservices
【原文标准名称】:信息技术.开式式系统互连.概念、模型和服务综述
【标准号】:BSISO/IEC9594-1-1995
【标准状态】:作废
【国别】:英国
【发布日期】:1997-03-15
【实施或试行日期】:1997-03-15
【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】:应用层(开放系统互连);验证;通信规程;信息交流;计算机网络;数据传送;协议;通信网;数据传输;开放系统互连;(OSI)指南;指南(OSI);情报系统;数据处理
【英文主题词】:Applicationlayer;Communicationservice;Dataprocessing;Directories;Informationinterchange;Informationtechnology;Networkinterconnection;Opensystemsinterconnection;OSI
【摘要】:TheDirectoryprovidesthedirectorycapabilitiesrequiredbyOSIapplications,OSImanagementprocesses,otherOSIlayerentities,andtelecommunicationsservices.Amongthecapabilitieswhichitprovidesarethoseof"user-friendlynaming",wherebyobjectscanbereferredtobynameswhicharesuitableforcitingbyhumanusers(thoughnotallobjectsneedhaveuser-friendlynames);and"name-to-addressmapping"whichallowsthebindingbetweenobjectsandtheirlocationstobedynamic.ThelattercapabilityallowsOSInetworks,forexample,tobe"self-configuring"inthesensethataddition,removalandthechangesofobjectlocationdonotaffectOSInetworkoperation.TheDirectoryisnotintendedtobeageneral-purposedatabasesystem,althoughitmaybebuiltonsuchsystems.Itisassumed,forinstance,that,asistypicalwithcommunicationsdirectories,thereisaconsiderablyhigherfrequencyof"queries"thanofupdates.Therateofupdatesisexpectedtobegovernedbythedynamicsofpeopleandorganizations,ratherthan,forexample,thedynamicsofnetworks.Thereisalsononeedforinstantaneousglobalcommitmentofupdates;transientconditionswherebotholdandnewversionsofthesameinformationareavailable,arequiteacceptable.ItisacharacteristicoftheDirectorythat,exceptasaconsequenceofdifferingaccessrightsorunpropagatedupdates,theresultsofdirectoryquerieswillnotbedependentontheidentityorlocationoftheinquirer.ThischaracteristicrenderstheDirectoryunsuitableforsometelecommunicationsapplications,forexamplesometypesofrouting.
【中国标准分类号】:L79
【国际标准分类号】:35_100_01;35_100_70
【页数】:28P.;A4
【正文语种】:英语

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上一篇: BS EN 61300-2-23-1997 光纤互联装置和无源部件.基本试验和测量规程.试验.光纤设备无增压闭路密封试验
下一篇: BS ISO/IEC 9594-2-1995 信息技术.开放式系统互连.模型

【英文标准名称】:Opticalfibreamplifiers-Basicspecifications-Part5-3:Testmethodsforreflectanceparameters;Reflectancetolerancetestmethodusingelectricalspectrumanalyzer
【原文标准名称】:光纤放大器.基本规范.第5-3部分:反射参数的试验方法.使用电谱分析仪的反射公差试验法
【标准号】:IEC61290-5-3-2002
【标准状态】:现行
【国别】:国际
【发布日期】:2002-03
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/SC86C
【标准类型】:()
【标准水平】:()
【中文主题词】:光波导;反射;反射系数的测量;放大器;试验;电气工程;规范;光学
【英文主题词】:Amplifiers;Basicspecification;Electricalengineering;Fibreoptics;Mathematicalcalculations;Measurement;Noisefigure;Opticalfibres;Opticalwaveguides;Optics;Parameters;Reflectance;Reflectancemeasurement;Reflection;Returnloss;Specification;Specification(approval);Spectralanalysis;Testset-ups;Testing
【摘要】:ThispartofIEC61290appliestoopticalfibreamplifiers(OFAs)usingactivefibres,containingrare-earthdopants,presentlycommerciallyavailable.TheobjectofthisInternationalStandardistoestablishuniformrequirementsforaccurateandreliablemeasurements,bymeansoftheelectricalspectrumanalysertestmethod,ofthefollowingOFAparameters,asdefinedinclause3ofIEC61291-1:a)maximumreflectancetolerableatinputb)maximumreflectancetolerableatoutputc)maximumreflectancetolerableatinputandoutputNOTEAllnumericalvaluesfollowedby(≠)arecurrentlyunderstudy.Ameasurementaccuracyforreflectancetolerableof±0,5dBshouldbeattainablewiththismethod.Thepresenttestmethodusesthenoisefigureasthemeasureofthe"tolerance"againstreflectanceateachportoftheOFA.Thisisbecausethe(total)noisefigureoftheOFAmaysignificantlydegradeduetothemultiple-interferenceifreflectanceatoneorbothofeachOFAportexists.
【中国标准分类号】:M33
【国际标准分类号】:33_180_30
【页数】:21P.;A4
【正文语种】:英语

Product Code:SAE J639
Title:Safety and Containment of Refrigerant for Mechanical Vapor Compression Systems Used for Mobile Air-Conditioning Systems
Issuing Committee:Interior Climate Control Committee
Scope:This SAE Recommended Practice is restricted to mechanical vapor compression refrigerant systems that provide cooling for the occupant's compartment. This document provides guidelines for refrigerant containment and safety for a mobile air-conditioning (A/C) system. It is not intended to restrict the use of, or further development of, other types of refrigeration systems for passenger compartment cooling. Should other systems be found practical at some future time, this document may be amended or an additional recommended safety practice drawn up for other types of systems. This document only addresses CFC-12 (R-12) and HFC-134a (R-134a) refrigerants. To prevent mobile A/C system refrigerant contamination, all other alternate refrigerants considered for automotive use require unique service fittings.