off hook circuit

基本解釋

The automatic two-way signaling used on these circuits causes the station instrument on one end of the circuit to ring when the station instrument on the other end goes off-hook.
這些線路上使用的自動雙向信令引起線路一端的電話機(jī)振鈴，而另一端的電話機(jī)摘機(jī)應(yīng)答。
By the method, when the telephone has a long time without conversation, and the hook switch circuit is in off-hook state, the switch circuit can be changed into on-hook state automatically.
藉由此自動掛機(jī)的方法，當(dāng)電話系統(tǒng)在持續(xù)一預(yù)設(shè)時(shí)間未進(jìn)行正常通話的時(shí)候，且叉簧電路為摘機(jī)狀態(tài)時(shí)，叉簧電路仍可自動切換成掛機(jī)狀態(tài)。
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