【英文标准名称】:Cablenetworksfortelevisionsignals,soundsignalsandinteractiveservices-Part1:Systemperformanceofforwardpaths
【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.第1部分:正向传输路径的系统性能
【标准号】:IEC60728-1-2007
【标准状态】:现行
【国别】:国际
【发布日期】:2007-09
【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/TC100
【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;架设电缆的分布系统;有线电视;同轴;同轴电缆;兼容性;可混用性;定义;电气工程;交互式的;测量技术;性能;性能要求;额定值;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;Measuringtechniques;Performance;Performancerequirements;Ratings;Receptionantennae;Signaltransmission;Soundbroadcasting;Specification(approval);Televisionbroadcasting;Televisiontransmission;Visionsignals
【摘要】:ThispartofIEC60728isapplicabletoanycablenetwork(includingindividualreceivingsystems)havingintheforwardpathacoaxialcableoutputandprimarilyintendedfortelevisionandsoundsignalsoperatingbetweenabout30MHzand3000MHz．Thisstandardspecifiesthebasicmethodsofmeasurementoftheoperationalcharacteristicsofcablenetworkhavingcoaxialcableoutputsinordertoassesslheperformanceofthesesystemsandtheirperformancelimits．AIlrequirementsrefertotheperformancelimits,whichshallbeobtainedbetweentheinput(s)totheheadendorheadendsandanysystemoutletwhenterminatedinaresistanceequaltothenominalloadimpedanceoffhesystem．unlessotherwisespecified．Wheresystemoutletsarenotused,theaboveappliesatthesubscriber'sendofthesubscriber'sfeeder．Alsotherequirementswhichareobtainedbetweentheinput(s)totheheadendorheadendsandanyhomenetworkinterface(HNI)aregiven．NOTE1Methodsofmeasurementdescribedinthisstandardareconsideredasbasic．However,anyequivalentmethodthatensuresatleastthesameaccuracymaybeused．NOTE2Ifthesystemoperatorwishestosubdividethesystemintoanumberofpartsorwishestousedifferenttransmissionmedia(forexample,coaxialcabling,balancedcabling．opticalcabling),theaccumulationofaegraaationsshouldnotexceedthefIguresgiveninthisstandard．NOTE3SystemperformancerequirementsofreturnpathsaswellasspecificmethodsofmeasurementfortheuseofthereturnpathsincablenetworksaredescribedinIEC60728—10．Clause5definesthesystemperformancelimitswhichwill,withanunimpairedinput,(headendinputsignal),producepictureandsoundsignals(atsystemoutlets)wheretheimpairmenttoanysingleparameterwiIIbenotworse．innormaIoperatingconditionsforanyanaloguechanneI,thanGradefouronthefive—gradeimpairmentscalecontainedinITU-BT500-10．Fordigitallymodulatedsignals．thequalityrequirementisaquasi-error-free(QEF)reception．AppropriateperformancerequirementsforthesignalsatthereceivingantennassitearegiyeninClause6inordertoprovideattheinputoftheheadendofthecablenetworkbothanalogueanddigitaltelevisionsignalswithsuitablequality．一Clause7isapplicabletohomenetworks(includingthoseofindividualreceivingsystems)usingcoaxialcables,balancedcablesoropticalcablesandprimarilyintendedfortelevisionsignals,soundsignalsandinteractiveservices,operatingbetweenabout30MHzand3000MHz．Thisclause,consideringthebasicoperationalcharacteristicsofahomenetwork,specifiestherequirementswhichshallbeobtainedatthehomenetworkinterface(HNI)takingintoaccounttheperformancerequirementsgivenatthesystemoutletorattheterminalinput．
【中国标准分类号】:M60
【国际标准分类号】:33_060_40
【页数】:156P;A4
【正文语种】:英语


Product Code:SAE MAM4141
Title:Aluminum Alloy, Die Forgings, 5.6zn 2.5mg 1.6cu 0.23cr Solution and Precipitation Heat Treated (Cancelled Mar 2003)
Issuing Committee:Ams D Nonferrous Alloys Committee
Scope:This specification covers an aluminum alloy in the form of die forgings and forging stock ordered to metric (SI) units. Primarily for parts requiring good resistance to stress-corrosion cracking but with lower strength than AMS-4139.