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引用次数: 0
摘要
在混合光纤/同轴电缆分配网络上传输语音和视频服务的关键技术和经济因素进行了审查。研究了在每个光网络单元(ONU)有8个活单元(lu)的窄带光纤到路边(FTTC)系统中提供多通道数字视频服务的两种升级架构。升级后的视频用户可以访问交换频道和140个多播或广播频道的菜单，所有这些频道都被数字压缩到每频道4mb /s。其中一种升级架构使用波分复用(WDM)覆盖将视频通道从主机数字终端(HDT)传输到升级后的onu，并将同轴传输到客户端的机顶盒转换器。备选架构使用子载波多路复用(SCM)技术将16正交AM (QAM)格式的视频信道传输到视频onu (v - onu)，每个视频onu通过同轴总线分布服务于64个luu。
Comparisons of fiber-to-the-curb upgrade alternatives for multichannel digital video
Key technical and economic factors involved in transporting voice and video services over hybrid fiber/coax distribution networks are examined. Two upgrade architectures for providing multichannel digital video services as an overlay in a narrowband fiber-to-the-curb (FTTC) system with eight living units (LUs) per optical network unit (ONU) are investigated. The upgrade provides video subscribers with access to switched channels and to a menu of 140 multicast or broadcast channels, all digitally compressed to 4 Mb/s per channel. One of the upgrade architectures transports video channels in asynchronous transfer mode (ATM) cells using a wavelength division multiplexing (WDM) overlay from the host digital terminal (HDT) to upgraded ONUs, with coaxial drops to set-top converters at the customer premises. The alternative architecture uses subcarrier multiplexing (SCM) technqiues to transport video channels in 16-quadrature AM (QAM) format to video ONUs (V-ONUs) each serving 64 LUs through a coax-bus distribution.
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