Multipoint monitoring method, monitoring point apparatus, and monitoring station apparatus

摘要

A multipoint monitoring method is provided for monitoring plural monitoring points that are connected to a monitoring station by an optical transmission line in which an optical abnormality detection signal of the wavelength component unique to a monitoring point where an abnormality is detected is multiplexed with an optical signal supplied from the optical transmission line to be output to the optical transmission line. According to such a multipoint monitoring method, a monitoring point where an abnormality is occurring may be specified by demultiplexing the optical signal supplied from the optical transmission line into wavelength components at the monitoring station and determining whether a specific wavelength component is supplied.