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1 引言 随着科学技术的进步,有线电视信号传输由单一的同轴电缆传输技术发展到采用先进的光纤传输、微波传输技术,使网络的带宽得到扩展,传输质量显著提高,一般光纤传输系统在频道容量高达59个时C/N达50db,CTB<-35db,CSO<-62db。由于FM微波传输具有传输质量高、传输距离远,联网快、投资省、效益高的优势。钟祥有线电视“九五”发展规划。采用AM光纤传输技术,选取FM微波对全市联网作为初级的过渡性措施。 为使有线电视进一步发挥“喉舌”主功能作用,借鉴发达国
1 Introduction With the advancement of science and technology, the transmission of CATV signals from a single coaxial cable transmission technology to the use of advanced optical fiber transmission and microwave transmission technologies has expanded the bandwidth of the network and greatly improved the transmission quality. The optical fiber transmission system Channel capacity of up to 59 C / N up to 50db, CTB <-35db, CSO <-62db. FM microwave transmission with high transmission quality, transmission distance, fast networking, investment, the advantages of high efficiency. Zhongxiang Cable TV “Nine Five” development plan. Using AM fiber transmission technology, select the FM microwave network transition as a primary measure of the transition. In order to make cable television play a “mouthpiece” function of the main function, learn from the developed countries