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中国有线电视技术从自力更生、白手起家,到引进国外先进设备,系统技术水平发展很快。从VHF频段、全频道共用天线系统到750MHz、860MHz有线电视城域网系统,从同轴电缆传输到光缆、电缆、MMDS等多种传输技术的混合应用,从只传输模拟信号到模拟、数字信号的混合传输,从单向广播网到双向交互网络。同时,先进的数据传输设备、数字传输系统以及计算机技术在有线电视系统中的成功运用,中国有线电视技术的发展日益接近国际先进水平。综合介绍了有线电视网络目前实施的系统组成,特别是光纤同轴电缆混合网络——HFC款待接入网的拓扑结构及双向传输的实现方式。
China’s cable TV technology has grown from self-reliance to self-reliance to the introduction of advanced foreign equipment. The system technology has developed rapidly. From VHF band, all-channel common antenna system to 750MHz, 860MHz cable TV MAN system, from coaxial cable transmission to the optical cable, cable, MMDS and other transmission technologies, hybrid applications, from the transmission of analog signals to analog, digital signals Hybrid transmission, from one-way broadcast network to two-way interactive network. Meanwhile, the successful application of advanced data transmission equipment, digital transmission systems and computer technology in cable television systems has made the development of China’s cable television technology closer to the international advanced level. This paper introduces the current system constitution of CATV network, especially the hybrid structure of optical fiber coaxial cable, the topology of HFC network and the realization of bidirectional transmission.