First, the theory foundation of SDH digital cross-connect matrix is dissertated.

首先，论文对SDH数字交叉连接矩阵设计的理论基础进行了介绍。

youdao

First, the theory foundation of SDH digital cross-connect matrix is dissertated.

首先，论文对SDH数字交叉连接矩阵设计的理论基础进行了介绍。

youdao