| 摘要 |
<p>PURPOSE:To supervise n-number of lines with one supervisory filter, by providing a supervisory signal detecting means for each line and switching and connecting the supervisory filter to respective lines by detection outputs of a supervisory signal detecting means. CONSTITUTION:In the circuit where n-number of lines are star-connected to one station by a signal line and a supervisory signal line, detectors 11A, 11B...11D which detect the supervisory signal such as a pulse trio signal in regenerative repeaters 4A, 4B...4D and relays 12A, 12B...12D which are operated by outputs of detectors 11A, 11B...11D are provided. When the supervisory signal is sent to the signal line in the circuit to which a terminal station belongs, the regenerative repeater 4A receives it and amplifies it, and the detector 11A detects the supervisory signal. The relay 12A is operated by this detection output, and a supervisory filter 13 is connected between the demodulation output of the regenerative repeater 4A and the supervisory signal line.</p> |
