The current method to branch wire from the cable trunk is to cut off the trunk line, and crimp two ends of trunk line and the required branch, and pack them, or to bind the branch line to trunk line.

现行的从电缆主干线上取得分支线的方法就是切断主干线，将干线两头和所分的支线一同压接后包裹起来，或是将分支线绑轧在主干线上。

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Used in central equipment room or building wiring room to realize the distribution of vertical trunk line and horizontal trunk line.

用于中心机房或大楼配线间，实现垂直干线和水平干线的分配。

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Then divides the highway network into four levels: main trunk line, sub-trunk, feeder and connecting line, and also positions functions of the four levels.

进而按照通达程度将公路网划分为四个等级：主干线、次主干线、支线和连接线，并分别对四个层级进行了功能定位；

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Then divides the highway network into four levels: main trunk line, sub-trunk, feeder and connecting line, and also positions functions of the four levels.

进而按照通达程度将公路网划分为四个等级：主干线、次主干线、支线和连接线，并分别对四个层级进行了功能定位；

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