| 摘要 |
PURPOSE:To enable to make long the distance between stations even if a certain attenuation is present at the optical switch section, by tentatively increasing the transmission power of the prestage station for the by-passed station at by-pass. CONSTITUTION:On the closed loop formed with the optical fiber data highway 1, the data transmission and reception sections on which the fiber selectors 10, 20, 30 and the repeaters 11, 21, 31 are respectively provided are in cascade connection. If the remote station 22 and the repeater 23 are in failure, the optical switch is selected to by-pass side and the selection instruction 201 is given to the remote station 12. After that, the selection instruction increases the optical output of the remote station to maximum output to enable the transmission to the remote station 32. |
