| 摘要 |
<p>An optical communications system includes a plurality of optical transmission lines (L-S1 to L-SN) in an active system and an optical transmission line (L-P) in a protection system, and transmitter/receiver devices (1-1 to 1-N, 1-P) connected to respective ends of the optical transmission lines. The transmitter/receiver devices respectively include a first interface unit (2) for establishing a first interface with signal transmission lines, a second interface unit (4) for establishing a second interface with one of the optical transmission lines, a first multiplexer/demultiplexer unit (3-1) for executing a first multiplexing and demultiplexing operation, and a second multiplexer/demultiplexer unit (3-2) for executing a second multiplexing and demultiplexing operation. Further, the transmitter/receiver devices respectively include a switching unit (6), which is provided between the first and second multiplexer/demultiplexer units, for selectively coupling the first and second multiplexer/demultiplexer units in the active system with the first and second multiplexer/demultiplexer units in the protection system by means of optical fiber cables. <IMAGE></p> |
