WAVELENGTH MULTIPLEX COMMUNICATION EQUIPMENT, WAVELENGTH MULTIPLEX COMMUNICATION SYSTEM, AND TRANSMISSION LINE CHANGEOVER SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide wavelength multiplex communication equipment, a wavelength multiplex communication system, and a transmission line changeover system for preventing simultaneous use of an active system transmission line and a standby system transmission line on the occurrence of a fault.;SOLUTION: Each of wavelength multiplexers 11-14 is provided with a plurality of receivers 21, a plurality of λ E/O sections 22, a multiplexer section 23 for multiplexing optical signals, a demultiplexer section 24 for demultiplexing a wavelength multiplex signal, a plurality of O/E sections 25, a plurality of transmitters 26, a transmitter side monitor circuit 27 and a receiver side monitor circuit 28 that are connected to a transmitter side path and a receiver side path respectively to detect a signal fault, and a mask circuit 29 that shuts off transmission of the signal according to a notice from the monitor circuits. When the monitor circuits detect a fault in a signal through the transmitter side path or the receiver side path, the monitor circuits inform the mask circuit about the fault of all the signals, the mask circuit notified about the fault shuts off transmission of all the signals and changeover devices 31-34 sensing the signal shut off simultaneously switch the active system transmission lines into the standby system transmission lines.;COPYRIGHT: (C)2003,JPO