Terminal device for searching for trouble section

Abstract

Abstract PURPOSE:To rationalize the demarcation of a trouble and improve its efficiency by providing a wave selective reflecting filter on an optical cable transmission line, and transmitting a reflected signal to an optical cable and observing it. CONSTITUTION:When a trouble position is searched for, a monitoring and transmitting circuit 21 is actuated to send out a light signal with wavelength LAMBDA1. The reflected light from a reflecting filter 4 is detected by a terminal device 1 and when the detected level is normal, a light signal with wavelength LAMBDA2 is sent out. This light signal is reflected by a reflecting filter 5, and returned to and detected by terminal device. When the detected level is normal, it is judged that the optical cable transmission line 2 extending to the terminal device 3 is normal.

Inventors

• 👤 Koichi Sano
• 👤 浩一 佐野
• 👤 Takaichi Watanabe
• 👤 隆市 渡辺
• 👤 Masafumi Kurosawa
• 👤 黒沢　雅文

Bibliographic Details