在本文中针对以太网的业务层提出一种帧结构——用与适宜以太城域网。
This document provides architectural framework to model the Ethernet Services Layer-ETH Layer- of MEF compliant Metro Ethernet Networks (MENs).
一项叫做光以太网的新技术开始使城域网(MAN)发生变革。
A new technology called Optical Ethernet is beginning to revolutionize metropolitan-area networks (MAN).
现在，千兆位以太网已用于一些城域网（man），标准机构正在为大城市网、甚至广域网制定10千。
Now, Gigabit Ethernet is being used in some metropolitan-area networks (MAN), and standards bodies are readying 10-Gigabit Ethernet for metropolitan and even WANs.
光纤以太网把以太网技术扩展到LAN之外，进入城域网（MAN） 。
The optical Ethernet extends Ethernet technologies from LAN to metropolitan area network(MAN).
可以肯定地说，在城域网和广域网方面，以太网都有厉害的竞争者。
To be sure, Ethernet has some serious competitors in both MANs and WANs.
可以肯定地说，在城域网和广域网方面，以太网都有厉害的竞争者。
To be sure, Ethernet has some serious competitors in both MANs and WANs.
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