三网融合是一种广义的说法,在现阶段它并不意味着电信网、计算机网和有线电视网三大网络的物理合一,而主要是指高层业务应用的融合。其表现为技术上趋向一致,网络层上可以实现互联互通,形成无缝覆盖,业务层上互相渗透和交叉,应用层上趋向使用统一的IP协议, Triple play is a general term, at this stage it does not mean that the telecom network, computer network and cable networks three physical unity, but mainly refers to the integration of high-level business applications. The performance of the technology tend to be the same, the network layer can achieve interoperability, the formation of seamless coverage, business layer penetration and cross each other, the application layer tend to use a unified IP protocol,