BS EN 60793-1-48-2008 光纤.测量方法和试验程序.偏振模色散

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【英文标准名称】:Eye-protectors;shields,screensandhelmets;termsformsandsafetyrequirements
【原文标准名称】:眼防护用具.护面板.护面帽.护面罩.概念.式样和安全技术要求
【标准号】:DIN58214-1988
【标准状态】:作废
【国别】:德国
【发布日期】:1988-01
【实施或试行日期】:1988-01-01
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:规范(审批);安全要求;安全工程;定义;安全;作标记;使用说明;防护服装;检验;特性;形状;护目设备;名称与符号;尺寸;护目器;面罩
【英文主题词】:
【摘要】:
【中国标准分类号】:C73
【国际标准分类号】:13_340_10
【页数】:11P;A4
【正文语种】:德语


【英文标准名称】:Cableddistributionsystemsfortelevisionandsoundsignals-Systemperformanceforreturnpaths
【原文标准名称】:电视和声音信号的电缆分配系统.回程线路的系统性能
【标准号】:BSEN50083-10-2002
【标准状态】:现行
【国别】:英国
【发布日期】:2002-04-18
【实施或试行日期】:2002-04-18
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:1GeneralStandardsofEN50083seriesdealwithcablenetworksfortelevisionsignals,soundsignalsandinteractiveservicesincludingequipment,systemsandinstallations-forheadend-reception,processinganddistributionoftelevisionandsoundsignalsandtheirassociateddatasignals,and-forprocessing,interfacingandtransmittingallkindsofsignalsforinteractiveservicesusingallapplicabletransmissionmedia.Allkindsofnetworkslike-CATV-networks-MATV-networksandSMATV-networks-individualreceivingnetworksandallkindsofequipment,systemsandinstallationsinstalledinsuchnetworks,arewithinthisscope.Theextentofthesestandardisationworkisfromtheantennas,specialsignalsourceinputstotheheadendorotherinterfacepointstothenetworkuptothesystemoutletortheterminalinput,wherenosystemoutletexists.Thestandardisationofanyuserterminals(i.e.tuners,receivers,decoders,multimediaterminalsetc.)aswellasofanycoaxialandopticalcablesandaccessoriesthereforisexcluded.2Specificscopeofthispart10Thisstandardisdealingwiththetransparentreturnpathofcablenetworksoperatedinthefrequencyrangebetween5MHzand65MHzorpartsthereof.Higherfrequenciesmaybeusedinfibrebasednetworks.NOTEInadditionitispossibletousethefrequencyrangefrom0MHzto5MHzforreturnpathtransmissions,e.g.forNMSorothercontrol,monitoringandsignallingpurposes.Applicationsbelow5MHzarenotcoveredbythisstandard.Anactivereturnpathcarriestypicallyonlyreturnsignals.Apassivereturnpathcanbeusedforbothreturnandforwardsignals.Thisstandardlaysdownthebasicmethodsofmeasurementforsignalstypicallyusedinthereturnpathofcablenetworksinordertoassesstheperformanceofthosesignalsandtheirperformancelimits.Allrequirementsrefertotheperformancelimitswhichshallbeobtainedbetweenthereferencepoints(Figure1)ofthereturnpathsystem.Onereferencepointisthenetworkterminationclosetothesubscriber.Itisthelastpointwhereallforwardandreturnsignalsarepresentandcarriedonthesamecable.Ifnonetworkterminationpointexists,thereferencepointisthesystemoutlet.Theotherreferencepointistheinputofthereturnsignalreceiver(ortransceiver).Atthispointthetransparentsignalpathendsandbehindthispointthesignalistreatedinanon-transparentway.Thereturnsignalreceivercanbesituatedattheheadendbutcanalsobeatthenodeofthecoaxialcelloratanyotherpointofthenetwork.Inadditiontothesystemperformancerequirementsforthetransparentreturnpath,systemperformancerecommendationswerelaiddowninthisstandarde.g.fortheoverallfrequencyallocation,fortheuseofspecificmodulationtechniquesfordifferentinteractivemultimediaservicesorfordifferentsub-bandswithinthereturnpathfrequencyrange,etc.Specificequipmentinstalledincablenetworksfortheoperationofsuchreturnpathsisstandardisedintherelevantequipmentstandards,parts3to6oftheEN50083series.Transmissionsystemsarenotwithinthescopeofthisstandard.
【中国标准分类号】:M60
【国际标准分类号】:33_060_40
【页数】:34P;A4
【正文语种】:英语