系统功能结构划分为三层：核心功能层，会务管理层和网络管理层。
The functional structure of system is divided into key function layer, conference affair management layer and the network management layer.
在介绍EPA网络体系结构的基础上，详细地描述了《EPA标准》的核心部分：应用层服务和管理层服务，并介绍了基于《EPA标准》的演示系统，从而验证了《EPA标准》的可行性与正确性。
The application layer and management layer, the core of EPA profile, are described detailedly after the architecture of EPA network is introduced and EPA profile is proved out by the demo system.
在电信管理网(TMN)五层网络管理模型中，网元层和网元管理层是非常重要的两层。
In the telecommunication management network (TMN) with five network managements model, network element and network element management level is most important.
在电信管理网(TMN)五层网络管理模型中，网元层和网元管理层是非常重要的两层。
In the telecommunication management network (TMN) with five network managements model, network element and network element management level is most important.
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