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【英文标准名称】:Informationtechnology-Telecommunicationsandinformationexchangebetweensystems-Definitionoftherelayingfunctionsofanetworklayerintermediatesystem
【原文标准名称】:信息技术.系统间通信和信息交换.网络层中间系统的中继功能定义
【标准号】:BSISO/IEC10028-1993
【标准状态】:现行
【国别】:英国
【发布日期】:1994-03-15
【实施或试行日期】:1994-03-15
【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】:通信程序;数据处理;定义;信息交流;信息交换;信息技术;网络;网络互连;网络层;开放系统互连;OSI;通信;传输程序
【英文主题词】:Communicationprocedures;Dataprocessing;Definition;Definitions;Informationexchange;Informationinterchange;Informationtechnology;Network;Networkinterconnection;Networklayers;Opensystemsinterconnection;OSI;Telecommunications;Transmissionprocedures
【摘要】:ThisInternationalStandarddefinestheabstractoperationoftherelayingfunctionsofaNetworkentityinanintermediatesystem,asneededtosupporttheOSIconnection-modeNetworkservice.Astheprincipalmeansforexpressingthedefinition,theconceptoftheNetworkInternalLayerServiceisused.ThisissimilartoanOSIlayerservice,butadaptedtoexpressingtheinvariantsoftheinformationflowwithinandthroughoutthelayer,ratherthanjusttheexternalfunctionalityofthelayerprovidedbetweentwoserviceaccesspoints.ThedefinitionincludestheinvocationofNetworkroutingfunctionsasanecessaryelementoftheNetworkrelayingfunctions,butitdoesnotspecifyhowthoseroutingfunctionsaretoberealized.ThedefinitionofNetworkrelayingfunctionsappliesbothtoasubnetworksupportingallelementsoftheNetworkService(asdefinedinISO8648),andtoaNetworkrelaysysteminterconnectingtwosubnetworksaccordingtoanyofthethreeapproachesdefinedinISO8648.Inthecaseofthehop-by-hopharmonizationapproachtointerconnection,thedefinitionofNetworkrelayingfunctionsappliestotheresultofharmonizingthesubnetworkservice(s)totheleveloftheNetworkService.Theharmonizationfunctions,whichrequireprotocolmechanismstobespecified,areoutsidethescopeofthisInternationalStandard.ThisInternationalStandardisintendedforuseinguidingthedesignandapplicationofrealinterworkingunitsandrealsubnetworks(eg,localareanetworksandprivatepacketswitchednetworks)whicharetosupporttheOSINS.ItisalsointendedforuseinthedevelopmentofstandardsfortheNetworklayer,toensurethattherequirementsderivingfromtheneedforNetworklayerrelayingaretakenintoaccount.TherearenorequirementsforconformancetothisInternationalStandard.NOTE—ConformancerequirementsrelatingtoNetworklayerrelayingaretobefoundinthespecificationsformappingsbetweentheNctworkInternalLayerServiceandNetworkprotocols.
【中国标准分类号】:L79
【国际标准分类号】:33_040_40;35_110
【页数】:40P.;A4
【正文语种】:英语


【英文标准名称】:Safetyrequirementsforelectronicflashapparatusforphotographicpurposes
【原文标准名称】:摄影用电子闪光设备安全性要求
【标准号】:BSEN60491-1997
【标准状态】:作废
【国别】:英国
【发布日期】:1997-06-15
【实施或试行日期】:1997-06-15
【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】:耐久试验;接线端;电气安全;划痕试验;电气试验;作标记;材料强度;电子闪光设备;电绝缘;性能;使用说明;安全措施;变形;间隙;闪光设备;软导体;漏电路径;定型试验;摄影设备;绕组;试验条件;温升;试验设备;电路;摄影照明设备;冲击试验;开关;摄影
【英文主题词】:Ambienttemperature;Breakdown;Components;Contactsafetydevices;Definition;Definitions;Electricalengineering;Electricalsafety;Electronicengineering;Electronicflashapparatus;Electronicflashequipment;Electronicinstruments;Equipmentsafety;Flashequipment;Heating;Inscription;Insulations;Moisture;Performance;Phototechnology;Photoelectronics;Photography;Resistance;Safety;Safetyengineering;Safetyregulations;Safetyrequirements;Screwedjoints;Specification(approval);Stillcamera;Strain;Strengthofmaterials;Temperature;Testing
【摘要】:1Thisstandardappliestothefollowingelectronicflashapparatusforphotographicpurposes,havingastoredenergynotexceeding2000J,togetherwithassociatedapparatusandnotintendedtobesubjectedtodrippingorsplashing:—apparatusofthesingle-flashtypewhichcanhavemorethanoneflashheadoperatingatthesametime;—apparatusfortheilluminationofsequentialphotographicexposures;—batterychargersandsupplyunitstobeusedinconnectionwithelectronicflashapparatusforphotographicpurposes.Theseauxiliaryunitsmayformapartofthemainsplug;—accessories,suchaslightregulatorsandslaveunits,specifiedintheinstructionleaflet.Thisstandarddoesnotapplytostroboscopes.Aslongasnoappropriaterequirementsexistforapparatushavingastoredenergyexceeding2000J,thisstandardmaybeused,insofarasitisapplicable.Additionalrequirementsmaybenecessary,e.g.forexplosionandthermalradiation.Withregardtothesupply,thefollowingcategoriesarecovered:—mains-operatedapparatus;—battery-operatedapparatus;—apparatushavingacombinationofmainsandbatterysupply.Thisstandardisintendedtocoverapparatuswhichcanbeusedbothinmoderateandtropicalclimates.Forthemodellinglampscombinedwithelectronicflashapparatusforphotographicpurposes,additionalrequirementsmaybetakenfromIECPublication598-2-9:Luminaires,SectionNine—PhotoandFilmLuminaires(Non-professional),asfarasapplicable.2Thisstandarddoesnotapplytoapparatusdesignedforaratedsupplyvoltageexceeding250V(r.m.s.)againstearth.3Thisstandardisconcernedwithsafetyonlyandnotwiththeotherpropertiesoftheapparatus(seeClause3).
【中国标准分类号】:N46
【国际标准分类号】:37_040_10
【页数】:64P.;A4
【正文语种】:英语