Abstract: An optical wavelength multiplexing device includes: a wavelength selective switch including a first input port for receiving an optical signal, a second input port for receiving a monitoring signal, output ports for outputting the optical signal or the monitoring signal, and an adjustment unit that adjusts a level of the optical signal or the monitoring signal at one of the output ports; a measurement unit that measures an output level of the monitoring signal at one of the output ports; and a control unit that specifies an unused output port of the output ports as a monitoring target port; sets a specific adjustment amount to the monitoring target port; outputs the monitoring signal to the monitoring target port; and determines whether the monitoring target port has an abnormality, based on the output level at the monitoring target port and an estimated output level at the monitoring target port.

Abstract: A first monitoring device is disposed at a predetermined position and configured to monitor a location of an information apparatus that is movable, by performing a radio communication with the information apparatus. A second monitoring device is movable and configured to monitor a location of the information apparatus by performing the radio communication with the information apparatus. An apparatus monitoring device causes the radio communication with the information apparatus to be taken over between the first monitoring device and the second monitoring device, and collects results of monitoring the information apparatus, from the first monitoring device or the second monitoring device which has taken over the radio communication with the information apparatus.

Abstract: An optical wavelength multiplexing device includes: a wavelength selective switch including a first input port for receiving an optical signal, a second input port for receiving a monitoring signal, output ports for outputting the optical signal or the monitoring signal, and an adjustment unit that adjusts a level of the optical signal or the monitoring signal at one of the output ports; a measurement unit that measures an output level of the monitoring signal at one of the output ports; and a control unit that specifies an unused output port of the output ports as a monitoring target port; sets a specific adjustment amount to the monitoring target port; outputs the monitoring signal to the monitoring target port; and determines whether the monitoring target port has an abnormality, based on the output level at the monitoring target port and an estimated output level at the monitoring target port.

Abstract: A first monitoring device is disposed at a predetermined position and configured to monitor a location of an information apparatus that is movable, by performing a radio communication with the information apparatus. A second monitoring device is movable and configured to monitor a location of the information apparatus by performing the radio communication with the information apparatus. An apparatus monitoring device causes the radio communication with the information apparatus to be taken over between the first monitoring device and the second monitoring device, and collects results of monitoring the information apparatus, from the first monitoring device or the second monitoring device which has taken over the radio communication with the information apparatus.