- both way toll trunk circuit
- 长途 long-distance
- 双向 two-way
- 中继电路 repeat circuit
- 专线双向中继电路 private line two way trunk circuit; private line two-way trunk circuit
- 长途中继电路 toll junction circuit; trunk junction circuit
- 长途线中继电路 toll line relay circuit; toll line trunk circuit
- 立接长途中继电路 demand trunk circuit
- 专用长途中继电路 special toll trunk circuit
- 双向中继 bwt bothway trunk; two-way trunk bidirectional trunk; two-way trunk, bidirectional trunk
- 双向中继器 both way repeater
- 双向中继线 both way trunk; bothway trunk line; bwt bothwaytrunk; two way trunk line; two-action trunk; two-way trunk line
- 双向振铃中继电路 two way ring down trunk circuit; two-way ring down trunk circuit
- 无线双向中继线 wbwt wireless both way trunk
- 出中继电路 outgoing trunk circuit
- 入中继电路 incoming trunk circuit
- 中继电路 connecting circuit; junction circuit; link circuit; tc trunk circuit; trunk circuit
- 中继电路制 relay network system
- 出中继电路群 outgoing trunk circuit group
- 电子中继电路 electronic trunk circuit
- 回铃中继电路 ring back trunk circuit
- 汇接中继电路 tandem junction circuit
- 模拟中继电路 analog trunk circuit tac
- 去话中继电路 ogt outgoing trunk
- 振铃中继电路 ringing trunk circuit
- 中继电报电路 trunk telegraph circuit
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