| 摘要 |
<p>PURPOSE:To reduce the current of a group supervisory current supervisory panel by raising an alarm based on an output of a detecting means provided to a multiplex receiving input section to detect each supervisory current, and an output of a detecting means provided to a multiplex transmission output section. CONSTITUTION:A group supervisory current inputted from a transmission line to an input terminal 21 is shared to a line supervisory panel 32 and plural supergroup demodulators 23, and after the current is applied with frequency conversion to obtain a supervisory current of basic supergroup frequency band respectively by each demodulator 23, the converted current is outputted to an output terminal 31 via a group passing filter 26, group modulator 27, supergroup coupler 28, supergroup modulator 29, and a line coupler 30. Furhter, the output of the modulator 29 is transmitted to a line supervisory panel 33 and the group supervisory current is measured directly from a transmission line band with a control signal from a control diagnostic device 34 and the supervisory panel 32 sequentially. Further, when the supervisory panel 32 is normal and the supervisory panel 33 is failed, it is regarded that the own repeater is failed and an alarm is raised.</p> |
