First, the related concepts of DVE are presented, and DVE's network request and system structure are analyzed.
首先，介绍了DVE系统的相关概念，并分析了DVE系统的网络需求和体系结构。
Secondly, fundamental 3g technologies, concepts, structure of 3g network and billing system are presented, which are the basis of subsystem design.
第二部分，介绍了3 G技术的基本概念和基本常识，网络结构和计费组件构成。
The essential concepts, network structure and programming principle of metropolitan area network (MAN) are introduced briefly. And the solution for MAN construction of China Railcom is discussed.
简要介绍了城域网的基本概念、网络结构、规划原则，并针对中国铁通城域网建设论述了解决方案。
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