Optical communication system having transmission line switching system

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