The Metro Ethernet Forum (MEF) put forward the concept of Carrier Ethernet (ce) to improve Ethernet technology and make it a transmission convergence layer solution for Next Generation Network (NGN).
城域以太网论坛(MEF)提出了电信级以太网(CE)的概念，以改进以太网技术并使之成为下一代网络(NGN)传输汇聚层的解决方案。
The paper demonstrates the choice and the application of combined cable transmission network in rail transit, and analyzes the application of metro transmission system at pre-sent.
本文论述综合有线传输网络在城市轨道交通工程中的选择及应用，对目前地铁传输系统的应用也作了分析。
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