Fault-point orientation system

Abstract

Abstract PURPOSE: To make it possible to orientate both upward and downward directions at one point without requiring an interposing couple, by employing a method of sending a transmitted signal back to upward and downward circuits at a repeating point. CONSTITUTION: To optical fiber cable 16, fault search signal generator 4 and fault search signal measurer 5 of office 1 are connected and at a repeating point between cables 16, repeating boards 8 and 10 and BPF9 and transmission-line signal sending- back control circuit 18 connected to repeating board 8 are provided. Further, transmission-line signal sending-back circuit 17 is provided, and photo switch circuits 19 and 21, and photo attenuator 20 are also provided to this circuit 17. When a fault occurs in the transmission line, BPF9 extracts the band-frequency component of its own station and control circuit 18 is controlled by the output to switch circuits 19 and 21, thereby orientating repeating boards 8 and 10. Then, both upward downward directions are orientated bo provide orientation at one point without providing an interposing couple of search element. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Toshikazu Matsumoto
• 👤 Risuke Shimodaira

Bibliographic Details