satellite toll trunk 卫星长途中继线

TTTS Toll Trunk Transit Switch 长途中继线中转开关

special toll trunk circuit 专用长途中继电路

both way toll trunk circuit 长途双向中继电路

bothway toll trunk circuit 长途双向中继器

A-B toll trunk B长途中继线

outgoing toll trunk circuit 长途去话中继电器

both-way toll trunk circuit 长途双向中继电路

toll-connecting trunk 长途连接干线