日本富士通的工程师们已建立了一种数字化的全光缆有线电视实验系统,该系统使用光纤高速通信技术,能传输电视等级的信号和CD传真音。当该系统投入商用时,就会把光纤的全数据传输之优点真正带入家庭。目前,在开发阶段主要打算这种富士通系统为大城市提供服务,使有线电视业务得到非常大的改进。今后,该系统将升级,形成用户间交互式数据通信的宽带综合业务数字网的核心。这种富士通系统包括安装在有线电视中心的发送设备;安装在网络内各中心站的信号分支中心;安装在 Engineers at Japan’s Fujitsu have set up a digital all-optical CATV experimental system that uses optical fiber high-speed communications technology to transmit television-level signals and CD fax tones. When the system is put into commercial use, the benefits of full data transmission over fiber are truly brought into the home. At present, it is primarily intended that such Fujitsu systems serve the big cities in the development phase, resulting in a very significant improvement in the cable television business. In the future, the system will be upgraded to form the core of the broadband integrated services digital network for interactive data communications among users. The Fujitsu system includes a transmission equipment installed in a cable television center, a signal branching center installed at each central station in the network,