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。
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.
而在交换机这一边，介质卡通过介质电缆接到服务器网卡上，把数据从服务器上传送到交换机主干网上。
A media card on the switch side connects to the server nic through a media cable and transfers data from the server to the switch backplane.
主干电缆导体无接头，连续性好，减少了故障点。
Main cable conductor doesn't have splice, so has good continuity and decreases possibility of fault point.
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