有线电视HFC网络双向改造技术交流.ppt

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1、有线电视HFC网络双向改造技术交流天柏宽带市场发展部李颖然TVShoppingOnlineGamingDistanceLearningTVmailVODNVODDVB/IPTVSystemIntegrationBroadcastingEquipmentSet-TopBoxdesign系统方案头端设备网络设备机顶盒……有线电视IP宽带光纤干线运营资质……战略伙伴(21%)战略伙伴(16%)技术服务网络平台研发产品MiddlewareCABroadcastingControlSystemSubscriberManagementSystem天柏集团中信集团EPGRealt

2、imeDataTVWebContentsMotorola天柏在中国目录HFC网络概述双向网络改造的基本原则主流双向网络改造技术对比天地通BIOC双向网络改造方案介绍HFC有线电视网络<100ChannelsHeadendCOAXTapDropNodeHubHubNodeNodeCableModemPCNodeNodeNodeNodeNodeHubBroadbandRouteruBR7246PSTNInternetCNNHBOESPNFNNNodeDOWNSTREAM88-880MHzUPSTREAM5-42MHzRF频率RadioFrequency(RF)AboveAu

3、diotoInfraRedDownStream(DS)(Forward)Cablecompanytosubscriber55-750(860)MHzUpStream(US)(Reverse)SubscribertoCablecompany5-42(30)MHzNote:NonNorthAmericansystemscanhavedifferentcutofffrequenciessuchas65MHz,88Mhz105Mhzetc.模拟电视频道模拟/数字混传光发射机光接收机同轴电缆的传输特性DIRECTCURRENTALTERNATINGCURRENTIncreasin

4、gFrequencyForDirectCurrent,electronflowisdistributeduniformlythroughouttheconductor.Asfrequencyincreases,electronflowradiatestotheoutercircumference.Thisisknownas“skineffect”andisanimportantpropertyincoaxialcabledesign.COAXIALCABLEFOAMDIELECTRICCABLECHARACTERISTICS(dBper100ft)SIZE(OD)LOS

5、SLOSS(INCHES)(54MHz)(500MHz)1.160.230.771.000.310.970.8750.331.050.8400.301.050.7500.371.170.6250.461.400.5650.441.510.5000.541.700.4120.672.15RG61.604.60RG592.055.65FrequencyLoss(dB)slopeCENTERCONDUCTOREXTERNALJACKETDIELECTRICOUTERCONDUCTORCoaxialCable分配器和分支器SPLITTER>SPLITSSIGNALINTOTWO

6、EQUALSIGNALSLOSS=10LOG1/2=-3dB+Insertionloss=-3.5dBAvailablewithMULTIPLEEQUALorNONEQUALPORTS.AvailableforElectricalorOpticalApplications0dBmV-3.5dBmV-3.5dBmVSUBSCRIBERTAPTWOBASICTYPESPOWERPASSINGPOWERBLOCKINGABCA-BInsertionLossdecreasesasdroplossincreasesA-CInsertionLosshigher,andvariesw

7、ithnumberofdropsNumberofdropstypically2,4,8C-BIsolationincreasesasdroplossincreases0dBmV-0.5dBmV-36dBmV36dBdroploss放大器BASICONEWAYAMPLIFIERBASICTWOWAYAMPLIFIERACCouplerACCouplerForwardEqualiserATTPowerModuleATTHighPassLowPassHighPassLowPassATTATTForwardEqualiserPowerModu