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DT-40A型调度总机中继用户的呼入信号为自保持式,即一旦有铃流进入,不管对方挂机与否,除非人为扳动操作台上相应的扳键(摘机应答键),呼入信号将长响不息——用户指示灯闪亮和发出断续音响.此设计性能对调度室或变电站主控制室的调度电话来说,属正常且必须,以避免漏接调度电话。但对汇接载波维护用联络电话的操作台来说,就毫无必要。为此,我们对此类操作台的有关电路进行了改进。改进的方法是将中间继电器A_k的自保持接点去掉。这样呼入信号将由随载波机铃流断续动作的A_c接点直接控制,当主叫方试机后挂机时,调度通信总机发出的呼入信号随即自复。下面结合原电路进行具体说明。
DT-40A type dispatching switch trunk user’s incoming signal is self-sustaining, that is, once ringing flow enters, no matter the other party hangs up or not unless the person pulls the corresponding pull-down key on the console (off-hook answer key) The incoming signal will last forever - the user light flashes and intermittent sound.This design performance is normal and necessary for dispatch or dispatch calls in the main control room of the substation to avoid missed calls to the dispatch. However, it is not necessary for the operator station to maintain a contact phone for carrier maintenance. For this reason, we have improved the circuit of such console. The improved method is to remove the self-sustaining contact of the intermediate relay A_k. This inbound signal will be controlled directly by the A_c contact that operates intermittently with the carrier ringing. When the calling party hangs up after the test, the incoming call signal from the dispatching switchboard will be reset. The following combined with the original circuit for specific instructions.