| 摘要 |
PURPOSE:To prevent ineffective acquisition of a circuit by detecting an abnormal state, which allows the reception of a call signal regardless of a calling state when a terminal office calling subscriber dials its own number, and by releasing the radio circuit by the detection output. CONSTITUTION:Calling control circuit part 3 attains control operation while a terminal station is making a call, celled control circuit part 4 attains control operation while it is called, and circuit control circuir part 2 exercises supervisions over operation states of the both, thereby controlling the connection between a telephone- set circuit and radio circuit. As a result, when a terminal-station calling subscriber dials its station number, an abnormal state is detected which allows the reception of a calling signal regardless of the calling state, and the detection output releases the radio circuit, so that ineffective acquisition of the circuit can be prevented. |
