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1引言随着有线电视的飞速发展和三网融合时代的到来,传统的有线电视HFC网已经不能满足各种用户的不同要求,建设一个视频、数据、语音三网融合的可运营、可管理、可维护及可扩展的网络,推广互动电视、Internet上网和VoIP业务是广电网络的发展趋势。中小城市有线电视网络改造受网络规模、建设资金、人员素质等因素的局限,网络的双向化改造不宜照搬中心城市的方法,有必要选择一种适合自身条件的建设思路,使得改造后的接入网具备较强的可扩展性、广泛的适用性和灵活性,具有良好的服务质量保
1 Introduction With the rapid development of CATV and the advent of triple play era, the traditional CATV HFC network can no longer meet the different requirements of various users and build an operational, manageable, Maintainable and scalable network to promote interactive television, Internet access and VoIP services is the development trend of radio and television networks. Small and medium-sized cities, the transformation of cable networks by the network size, construction funds, personnel quality and other factors, the transformation of the network should not copy the center of the city’s method, it is necessary to choose a suitable own construction ideas, making the modified access Network with strong scalability, a wide range of applicability and flexibility, with good quality of service