| 摘要 |
PURPOSE:To reduce the number of optical fiber cables by gathering 0 system approach and return paths into one optical cable, and gathering 1 system approach and return paths into one optical fiber cable. CONSTITUTION:An optical signal is outputted in a TO carrier wave length band from the 0 system light transmitting part of a terminal station device 10 of an A station, and transmitted through a 0 system approach path optical fiber cable 21 and a 0 system optical demultiplexer/multiplexer module 40 of a B station, through a 0 system optical multiple fiber cable 31, and through the 0 system optical demultiplexer/multiple module 40 of a C station to a 0 system light receiving part of the terminal station device 10 of the C station. The optical signal is outputted in a T1 carrier wave length band from the 0 system light transmitting part of the terminal station device 10 of a D station, and transmitted through a 0 system return path optical fiber cable 22 and the 0 system optical demultiplexer/multiplexer module 40 of the C station, through the 0 system optical multiple fiber cable 31, and through the 0 system optical demultiplexer/multiplexer module 40 of the B station to the 0 system light receiving part of the terminal device 10 of the B station. The 0 system operation is executed in the same way as a 1 system. |
