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随着广播电视技术的发展,有线电视逐步从模拟向数字平移,现有的HFC网络担负着模拟和数字电视信号共同传输的任务,大多采用多级光纤链路级联和树型电缆分配的环-星-树型网络拓扑结构,所有信号都由前端通过光纤和同轴电缆向下传输,这种模式的网络结构复杂,可靠性不高,维护困难,如何保证数字电视高质量、不间断地传输,对有线电视整体向数字化平稳过渡具有十分重要的意义。对有线数字电视网络设计及维护中需注意的问题做简要分析。
With the development of radio and television technology, the cable gradually transforms from analog to digital. The existing HFC network is responsible for the common transmission of analog and digital television signals. Mostly, the multi-level optical fiber link cascade and tree cable distribution ring - Star - Tree network topology, all signals are transmitted from the front end through optical fiber and coaxial cable, the network structure of this model is complex, low reliability, maintenance is difficult, how to ensure high-quality digital TV, without interruption Transmission, the overall smooth transition to the digital cable has a very important significance. Cable digital television network design and maintenance should pay attention to the problem to do a brief analysis.