| 摘要 |
PURPOSE:To make ordinary dial operation to a receiver side possible without a queuing time by stopping the output of a dial signal when a gate circuit is closed but outputting the dial signal when the gate circuit is opened. CONSTITUTION:A gate circuit 8 gates and controls the output operation of the dial signal of a dial signal generating circuit 7. A gate signal generating circuit 10 detects a continuous dial tone which is inputted from a private branch exchange through a telephone line by a specific dial operation, and the circuit 10 gives such gate signal to the circuit that the circuit 8 is closed until this continuous dial tone is terminated. The circuit 7 is stopped from outputting the dial signal when the circuit 8 is closed, but the circuit 7 outputs the dial signal while the circuit 8 is opened, and thus, the dial operation to the other party can be performed following the specific dial operation for operation of exchange and connection of the exchange. |
