This paper discuss the theory problems of the network convergence and service convergence, demonstrate the network model of the three layers;
本文深入探讨了网络融合和业务融合的理论问题，论证了三层网络模型；
The three-network convergence is a main focus of this year's CCBN Exhibition.
“三网”融合是今年CCBN展览会的一个重要关注点。
According to the analysis of practical demand, the network topology adopts three-layer structure(Core layer, Convergence layer and Access layer)and kilomega Ethernet technology;
基础网络采用先进的千兆以太网技术，三层（核心层、汇聚层和接入层）网络拓扑结构；
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