MAN (MetropolitanAreaNetwork) traffic has advanced by leaps and bounds, making its characteristics change drastically and requiring its mathematical model to change also accordingly.
随着城域网流量的急剧增长，网络流量的特征发生了很大改变，因而网络流量的数学模型也需要随之改变。
2
To counter the problems existing in the establishing of MAN (metropolitanareanetwork), the author puts forward fiber-optic cabinet, introduce its principle functions and application in MAN.
针对目前城域网建设中存在的问题，介绍光缆交接箱的原理、功能以及在城域网建设中的应用。
3
The essential concepts, network structure and programming principle of metropolitanareanetwork (MAN) are introduced briefly. And the solution for MAN construction of China Railcom is discussed.