标准资料网-标准资料免费资源平台

【英文标准名称】:Cablednetworksfortelevisionsignals,soundsignalsandinteractiveservices-Part5:Headendequipment
【原文标准名称】:电视信号、声音信号和交互式服务用电缆网络.第5部分:数据转发器设备
【标准号】:IEC60728-5-2007
【标准状态】:现行
【国别】:国际
【发布日期】:2007-08
【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】:音频信号;宽带系统;广播工程;广播信号;广播;电缆配线箱;电缆分布系统;电缆电视;电缆网络;公共天线电视;同轴电缆;定义;分布系统;电磁兼容性;EMC;交互式;互调;测量;测量技术;噪声带宽;噪声测量;性能;额定值;信号;声音广播;声音传输;规范(验收);电视;电视广播;电视接收;电视技术;终端站;传输;传输技术;电视信号;宽带传输
【英文主题词】:Antennas;Audiosignals;Broadbandsystems;Broadcastengineering;Broadcastsignals;Broadcasting;Cabledistributioncubicles;Cabledistributionsystems;Cabletelevision;Cablednetworks;Central-antennatelevision;Coaxialcables;Decoding;Definitions;Distortion;Distributionsystems;Electromagneticcompatibility;EMC;Interactive;Intermodulation;Measurement;Measuringtechniques;Modulation;Noisebandwidths;Noisemeasurements;Properties;Radio-frequencysignals;Ratings;Signals;Signal-to-interferenceratio;Soundbroadcasting;Soundtransmission;Specification(approval);Television;Televisionbroadcasting;Televisionreception;Televisiontechnology;Terminalstations;Terrestrial;Transmission;Transmissiontechnique;Videosignals;Visionsignals;Widebandtransmission
【摘要】:ThispartofIEC60728definesthecharacteristicsofequipmentusedintheheadendsofterrestrialbroadcastandsatellitereceivingsystems(withoutsatelliteoutdoorunitsandwithoutthosebroadbandamplifiersintheheadendasdescribedinIEC60728-3).ThesatelliteoutdoorunitsforFSSaredescribedinETSIETS300158,forBSSinETSIETS300249.Testmethodsforbothtypes(FSSandBSS)ofsatelliteoutdoorunitsarelaiddowninETSIETS300457.Thisstandard?coversthefrequencyrange5MHzto3000MHz,?identifiesperformancerequirementsforcertainparameters,?laysdowndatapublicationrequirementsforcertainparameters,?stipulatesmethodsofmeasurements;?introducesminimumrequirementsdefiningqualitygrades(Q-grades).Thisstandarddefinestheoverallcharacteristicsforupstream/downstreamsignalsbetweenexternalsources/sinks(forexample,antennas,cablemodemterminationsystems,etc.)andthesysteminterfacetothecablenetwork.Inthecaseofmodularheadendsystems,alsosingleequipmentasmodulators,converters,etc.aredescribed.Cablemodemterminationsystems,encrypters,decrypters,etc.arenotdescribedinthisstandard.Ifsuchequipmentisusedinheadends,therelevantparametersforRF,video,audioanddatainterfacesshouldbemet.Accordingtothedefinitionsin3.1,theheadendsaredividedintothefollowingthreequalitygrades:?Grade1:centralheadend;?Grade2:hubheadendorhubsite;?Grade3:MATVheadend/individualreceptionheadend.
【中国标准分类号】:M60
【国际标准分类号】:33_060_40
【页数】:88P;A4
【正文语种】:英语


【英文标准名称】:WirethreadinsertsforISOmetricscrewthreads;gaugesandgaugesizes
【原文标准名称】:ISO米制螺纹用钢丝螺纹镶件.量规和量规尺寸
【标准号】:DIN8140-3-1993
【标准状态】:现行
【国别】:德国
【发布日期】:1993-03
【实施或试行日期】:
【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】:螺纹长度;名称与符号;外螺纹;极限尺寸;结构尺寸;米制的;表面防护;螺纹牙型;螺纹嵌镶件;过端量规;符号;ISO螺纹;金属线;合金;螺纹;量规;作标记;公差;米制螺纹;内螺纹;量规尺寸;生产剖面
【英文主题词】:
【摘要】:ThedocumentspecifiesdimensionsofgaugesfortestingwirethreadsinsertsforISO-metricscrewthreads.
【中国标准分类号】:J13
【国际标准分类号】:21_060_00
【页数】:5P;A4
【正文语种】:德语