双向干线 meaning in English

bothway trunk line
two-way trunk

Bi - directional trunk amplifer
双向干线放大器
This system can manage indoor optical transmitter , indoor optical workstation , outdoor optical workstation , bi - directional optical receiver , bi - directional trunk amplifier , return optical transmitter and optical receiver , ect
本系统可以管理室内光发射机室内光工作站野外光工作站双向光接收机双向干线放大器反向光反射机反向光接收机等设备。