用无源光网络改造县级有线电视网络

广电网络面临数字电视变革和一系列技术变化带来的冲击，小县城的有线电视网络设计模式陈旧，带宽窄，安全性与可靠性差，亟需改造，但用户少且分散，资金紧张，改造困难，数字化、双向化的增值业务为广电网络带来了希望，所以必须根据自身经营环境、资源条件，认真规划设计、全力运作，在网络改造中应按用户需求，先难后易，重点突出，分步实施。

To Develop the County-level CATV Network by Passive Optical Network

Broadcast network is confronted with the impacting of digital television transformation and serious of technology changes. It is necessary to develop the CATV network in small counties as the model of CATV net-work is old, unsafe, and unstable and the network bandwidth is narrow. The difficult to develop the network is that the lack and dispersion of users and the financial strain. However, the value-added service in DTV system brings the new hope. We must plan and design carefully according to the management circumstance and implement step by step.