| 摘要 |
PURPOSE:To obtain an order line communicating system excellent in secrecy by providing every slave station with an interface converter to make it possible to generate a ringing tone and an off-hook tone from a terminal only at the time of the detection of the station code of its own station. CONSTITUTION:A master station 1 returns the station code (e) intrinsic to each slave station sent from each slave station 2 as being multiplexed to an order line signal by multiplexing it to the order line signal to each slave station 2, and when the interface converter 22 of the slave station detects that a station code detector 21 receives the station code (e) of its own station or a general code, it make the terminal 13 capable of being used by making the generation of the ringing tone or the off-hook tone from the terminal 13 possible. Thus, the generation of the wrong ringing tone or the wrong off-hook tone can be prevented, and the order line communicating system excellent in the secrecy can be obtained. |
