【英文标准名称】:Methodsofmeasurementforequipmentusedindigitalmicrowaveradiotransmissionsystems-Measurementsonterrestrialradio-relaysystems-Digitalsignalprocessingsub-system
【原文标准名称】:数字微波无线电传输系统使用设备的测量方法.地面无线电中继系统的测量方法.数字信号处理子系统
【标准号】:BSEN60835-2-5-1995
【标准状态】:现行
【国别】:英国
【发布日期】:1995-10-15
【实施或试行日期】:1995-10-15
【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】:无线电通信链路;量值继电器;通信链路;微波链路;信号处理;信号电平;电路;警报系统;性能试验;测量继电器;无线电通信;无线电设备;信号传输;通信设备;电学测量;数字信号;试验设备
【英文主题词】:Communicationtechnology;Digitalengineering;Digitalsignals;Electricalengineering;Measuringtechniques;Microwavelinks;Radiocircuits;Radioengineering;Radioequipment;Radioplants;Radiosystems;Radio-relaysystems;Ratings;Signalprocessing;Subsystems;Telecommunication;Terrestrial;Transmissionsystems
【摘要】:Thissectiondealswiththemethodsofmeasurementonadigitalradiosignalprocessingsub-system.Thedigitalsignalprocessingsub-systemis,ingeneral,abletoperformthefollowingprincipalfunctions:-multiplexingoftwoormorebitstreams(seeIEC835-2-9,"ServiceChannels",figure1);-transmissionqualityevaluationforswitchingpurposesand/oralarmindicatingsignal(AIS)insertion;-codingandmultiplexingofdigitalservicechannels,(seenote);-scramblinganddescrambling;-series-to-parallelandparallel-to-seriesconversion.Systemconfigurationsdiffer,sosomeoftheabovefunctionsmaybemissing,inwhichcaseonlythemeasurementsrelatingtothosefunctionspresentshouldbetakenintoconsideration.Indigitalradio-relaysystems,manysystemconfigurationsexistwherenon-hierarchicalbitratesareused.Insuchcases,multiplexequipmentisusedinordertotransmitmorethanonehierarchicalbitstreamand/oradditionalservicechannels(e.g.34Mbit/sand140Mbit/swithbitinsertionforparitybitsanddigitalservicechannels,2×34Mbit/s,etc).Forlowbitratesystems,e.g.<2Mbit/sitmaynotbepracticabletoperformtestsatverylowBERsbecauseoftheexcessivelylongmeasurementtimesinvolved.Additionally,inmanycasesparitybitsaretransmittedforqualitycontrolandswitchingpurposes.However,asfaraspossible,thesystemshouldbetestedatdefinedinterfacepointssuchasthoseconsideredbytheCCITTRecommendationG.703.NOTE-DigitalservicechannelsaredealtwithinIEC835-2-9.
【中国标准分类号】:M36;M38
【国际标准分类号】:33_060_30
【页数】:28P;A4
【正文语种】:英语