| 摘要 |
PURPOSE:To detect a station node where a fault is occurring by detecting whether the station node is used or not, by giving the address of the station node to a frame signal showing the in-no-use state, and by transmitting it to a loop monitoring device. CONSTITUTION:Response control circuit 11 detects the signal which shows the in- use state of a station, and a synchronizing signal and the signal showing the result of the detection of the in-use state of the station are inputted to timing signal generating circuit 5 and then inputted to multiplexer circuit 13 via responding circuit 6. Then, the output of circuit 13, while synchronizing with data signals stored in buffer registers 7-9, is included in the data signals as the station address of signal in out-of phase; and a serial signal is returned to transmission line L0 from repeater 1 via register 14 which converts a parallel signal into the serial signal. |
