Loop Incoming Trunk 环路入中继

Trunk Self-loop Cable 中继自环电缆

LPICT LooP InComing Trunk 环路来话中继

LPOGT LooP OutGoing Trunk 环路去话中继

Loop Start Trunk 环路中继

trunk loop [通信] 中继线环路

loop-and-trunk layout 网路位置图

coaxial trunk self-loop cable 同轴中继自环电缆

Loop-start Trunk 回路启动干线