基本信息
| 标准名称： | 船用辅锅炉螺纹管 |
| 中标分类： |
船舶 >>
船用主辅机 >>
船用锅炉与蒸汽机 |
| 替代情况： | 转化为CB/T 3920-1999 |
| 发布日期： | 1900-01-01 |
| 实施日期： | 1991-02-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
适用范围
CB/T 3920-1999
前言
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引用标准
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所属分类： 船舶 船用主辅机 船用锅炉与蒸汽机
【英文标准名称】:Cablenetworksfortelevisionsignals,soundsignalsandinteractiveservices-Performancerequirementsforsignalsdeliveredatthesystemoutletinoperation
【原文标准名称】:电视信号、声音信号和交互式设备用电缆网络.运行系统出口信号传输的性能要求
【标准号】:BSEN60728-1-2-2009
【标准状态】:现行
【国别】:英国
【发布日期】:2010-01-31
【实施或试行日期】:2010-01-31
【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】:天线系统;音频信号;电缆分布系统;电缆电视;电缆电视系统;电缆分配系统;共用天线电视;同轴;同轴电缆;兼容性;定义;电气工程;交互式的;测量;测量技术;性能;性能要求;评定;接收天线;信号传输;声音广播;规范(验收);电视广播;电视传输;电视信号
【英文主题词】:Antennasystems;Audiosignals;Cabledistributionsystems;Cabletelevision;Cabletelevisionsystem;Cableddistributionsystems;CATV;Coaxial;Coaxialcables;Compatibility;Definitions;Electricalengineering;Interactive;Measurement;Measuringtechniques;Performance;Performancerequirements;Ratings;Receptionantennae;Signaltransmission;Soundbroadcasting;Specification(approval);Televisionbroadcasting;Televisiontransmission;Visionsignals
【摘要】:ThispartofIEC60728providestheminimumperformancerequirementstobefulfilledinoperationatthesystemoutletorterminalinputanddescribesthesummationcriteriafortheimpairmentspresentinthereceivedsignalsandthoseproducedbytheCATV/MATV/SMATVcablenetwork,includingindividualreceivingsystems.NOTE1Whenachangeofsignalformatismadeattheheadend,thesummationoftheimpairmentsdoesnotapply(seealsoClause57H7).Inabuildingdividedintoapartmentblocks,thesignalsreceivedbytheantennasaredistributedbytheMATV/SMATVcablenetworkuptothehomenetworkinterface(HNI);thetelevisionsignalsarethendistributed(insidethehome)byhomenetworks(HN)ofvarioustypesuptothesystemoutletorterminalinput.Thecablenetworkcansupporttwowayoperation,fromthesystemoutlet(orterminalinput)towardstheheadend.Thehomenetworkcanusecoaxialcables,balancedpaircables,fibreopticcables(glassorplastic)andalsowirelesslinksinsidearoom(orasmallnumberofadjacentrooms)toreplacewiredcords.ThispartofIEC60728isapplicabletocablenetworksintendedfortelevisionsignals,soundsignalsandinteractiveservicesoperatingbetweenabout5MHzand3000MHz.Thefrequencyrangeisextendedto6000MHzforhomedistributiontechniquesthatreplacewiredcordswithawirelesstwowaycommunicationinsidearoom(orasmallnumberofadjacentrooms)thatusesthe5GHzto6GHzfrequencyband.64H64H64H58HFigure1showsthemainsectionsofageneralCATV/MATV/SMATVsystem,indicatingthepartsoftheIEC60728-1seriesdocumentswheretherelevantperformancerequirementsareindicated.?TherequirementsforthesignalsreceivedattheheadendaregiveninClause6ofIEC60728-1.?TherequirementsfortheCATV/MATV/SMATVcablenetwork,assuminganunimpairedinputsignalattheinputoftheheadend,uptothesystemoutletaregiveninIEC60728-1,Clause5.?TherequirementsfortheCATV/MATV/SMATVcablenetworkuptothehomenetworkinterface(HNI)aregiveninIEC60728-1,Clause7,assuminganunimpairedinputsignalattheinputoftheheadend.?ThespecificrequirementsfromHNItothesystemoutletorterminalinputaregiveninIEC60728-1-1,Clause5,assuminganunimpairedinputsignalattheHNI.?TherequirementsatthesystemoutletinoperationaregiveninClause7ofthisstandard.Theexpression“inoperation”meansthatthereceivedsignals,withtheirimpairments,areappliedtotheheadendinputoftheCATV/MATV/SMATVcablenetwork.Therequirementsatthesystemoutlet“inoperation”arederived,therefore,bysummingtheimpairmentsofthevariouscascadedpartsofthesystemandoftheinputsignal.Whenachangeofsignalformatfromanaloguetoanalogue(e.g.fromFMtoAM-VSB)orfromdigitaltodigital(e.g.fromQPSKtoQAM)orfromdigitaltoanalogue(e.g.fromDVB-S/S2toAM-VSBorDVB-TtoAM-VSB)ismadeattheheadend,thesummationoftheimpairmentsthatproducearelaxationofrequirementsatsystemoutletdoesnotapply.Suchacasewillbetheequivalenceofunimpairedsignalsappliedattheheadendinput.ThereforetherequirementsatsystemoutletgiveninIEC60728-1apply.Thisstandardalsoprovidesreferencesforthebasicmethodsofmeasurementoftheoperationalcharacteristicsofthedownstreamcablenetworkinordertoassessitsperformance.Allrequirementsrefertotheperformancelimitstobeachievedinoperationatanysystemoutletwhenterminatedinaresistanceequaltothenominalloadimpedanceofthesystem,unlessotherwisespecified.Wheresystemoutletsarenotused,theaboveappliestotheterminalinput.
【中国标准分类号】:M60
【国际标准分类号】:33_120_10;33_160_01;35_110
【页数】:38P.;A4
【正文语种】:英语