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 此時,需要將同方向的交換中繼進行適當?shù)慕M合與合理規(guī)劃,根據(jù)中繼方向,結(jié)合傳輸網(wǎng)絡(luò)的結(jié)構(gòu),將不同方向的中繼電路組合在stm - 1端口中,并確定中繼電路在傳輸網(wǎng)中的組網(wǎng)方式。