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1、传输指标测试大全--------光口、电口、时钟前 言 传输指标测试大全(光口、电口、时钟)基本上完成了光口(STM-1、STM-4、STM-16)、电口(1.5M、2M、34M、45M、139M、155M)、时钟三个方面的内容总结,里面包含了全部指标的含义、定义、现有的测试仪表选择、在各个仪表上的测试方法等,总共有2000种左右的指标测试方法,内容及其丰富和全面。1 光口指标1.1 平均发送光功率1.1.1 指标含义发送机的发射光功率和所发送的数据信号中“1”占的比例有关,“1”越多,光功率也就越大。当发送伪随机信号时,“
2、1”和“0”大致各占一半,这时测试得到的功率就是平均发送光功率。1.1.2 测试仪表光功率计1.1.3 指标定义1) STM-1接口局内、短距:-8dbm~-15dbm;长距 :0dbm~-5dbm。2) STM-4接口局内、短距:-8dbm~-15dbm;长距 :2dbm~-3dbm。coefficientnotgreaterthan1.3;Highefficiency:control1hourtraveltimebetweenanytwopointswithinthevariousgroupswit
3、hintheareauptohalfanhour,1-houraccesstotheairport,45minreachedthecity'smaintraffichub,externalhighwayforhalfanhourwiththemainchannelsconnectingbus1.5hoursbetweenanytwogroupsofcoreareas;Intensive:2030transitsharerateofaround35%,2050bussharingrateof45%percent.3rdchapter,Yibincity,trafficsitu
4、ationandGeneral...3.1.1citytrafficstatus1,externaltransportpassengerandcargotrafficinYibincity,trafficatthepresentmainrailway,highway,waterwayandairfourmodesofpassengerandfreighttransport,thereandculturalheritage,highlightingtheculturaltasteandshapecharacteristicsofthecityinYibin.According
5、toforecasts,vision2050populationwillreach2.1millionpeopleinthecenterofYibincity,urbanlandisaround210km2.Figure2.6-12050figure2.7landuseplanningintheCenterCity,Yibincitydevelopmentrequiresthedevelopmentofbusrapidtransitconstructionandsocio-economicdevelopmenttrends,Yibincitycoordination,sup
6、portingurbanspacelayoutandinfrastructurenetworks,transportorganized,internalandexternaltraffichubsmoothlylinking,realizingsustainabledevelopmentofYibincityintegratedtransportationsystem.Concretecanbesummarizedas,accessible,efficient,intensiveandsustainable.Accessibility:Centralbuilt-uparea
7、roadnetworkdensityofabout7.0km/km2;buslinedensityof3-4km/km2,bustransfer3) STM-16接口局内:-3dBm~-10dBm;短距:0dBm~-5dBm;长距:3dBm~-2dBm。 1.1.4 测试步骤1) 从发送机引出光纤,接到光功率计上;2) 在光功率计上设置被测光的波长,待输出功率稳定,读出平均发送光功率。1.2 消光比1.2.1 指标含义光数据全部为“1”时,平均光功率为A;光数据全部