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１ 前言有线电视网是广泛入户的宽带分配网。进一步开发它，使之成为信息化基础设施的重要组成部分，是国内外同行思考和实践的热点。有线电视网要向宽带综合业务网过渡，就要结合先进的宽带网络交换和接入技术，对现有网络进行改造，但这一过程将受到资金、技术和工程周期的?
1 Introduction Cable television network is a widely distributed broadband distribution network. To further develop it and make it an important part of information infrastructure is a hot spot for both domestic and foreign counterparts to think and practice. Cable television network to the transition to broadband integrated services network, it is necessary to combine advanced broadband network switching and access technologies to transform the existing network, but this process will be capital, technology and engineering cycle?