AUTOMATIC PHONE PATCH DEVICE

摘要

PURPOSE:To attain an unmanned maintenance operation by inhibiting the incoming calls to a wire telephone circuit during the communication of a radio communication circuit. CONSTITUTION:An inhibition output 81 is applied to an incoming limiting circuit 2 from a squelch detecting circuit 8 to prevent the switching actions of a relay 11 while a radio equipment 200 is under a communication state and a squelch circuit is opened. However a tone transmitting circuit 9 is opened by another detection output given from a call detecting circuit 1 to supply the tone output of a tone ringer 10 with modulation through a transmission amplifier 5. Thus it is known that a phone patch is called to the remote side under communica tion. Then the communication is discontinued temporarily and the squelch circuit of the equipment 200 is closed. Thus the output 81 is erased and an incoming holding circuit 3 changes the relay 11 to the break side B. Then a phone patch call is possible. Here the present communication is important and the interrup tion of the phone patch is not desired. In such a case, it is possible to continue the communication as it is. Then the second call is carried out with an interval since it is known that a phone patch caller is busy from a fact that no circuit is connected.