Dedicated line telephone ring control device

摘要

The present invention relates to a dedicated line telephone ring control device adapted to digitally integrate a dedicated line telephone ring control into an FPGA by using a digital logic device.;The first AND gate inverts the on / off signal of the handset, and outputs the result of the AND operation. The first AND gate inverts the inverted ring control signal and the output signal of the inverter. An RS flip-flop for holding the previous output or inverting the previous output by logically combining the output signals of the first AND gate and the Noah gate as a set and reset input signal, And a second AND gate for ANDing the inverter and the ring control signal, respectively, and outputting the result as a ring control signal.