switching trunk meaning in Chinese

交换中继线
转接中继线

Toll switching trunk
长途交换干线
It is necessary to appropriately combine and rationally plan the switching trunks in the same direction , and combine the trunk circuits in different direction into a stm - 1 port and determine the way to network the trunk circuits in the transmission network according to the trunk direction and taking into account the structure of the transmission network
此时，需要将同方向的交换中继进行适当的组合与合理规划，根据中继方向，结合传输网络的结构，将不同方向的中继电路组合在stm - 1端口中，并确定中继电路在传输网中的组网方式。