Patent ID: 8588610
Filing Date: 2013-11-19
Classification: H04B,H04J,H04Q

Abstract:
1. A span loss monitoring system comprising: a supervisory signal sending apparatus comprising: a multiplexing section into which a wavelength-multiplexed signal and a supervisory signal are inputted and that multiplexes the inputted wavelength-multiplexed signal and supervisory signal; an output level monitoring section that measures and outputs an output level of a multiplexed light from the multiplexing section and outputs the multiplexed light to a transmission line; a time stamp generation section that detects the hour of the measurement by the output level monitoring section and associates the output level measurement hour and the output level with each other; and a supervisory signal generation section that generates the supervisory signal including a pair of the output level measurement hour and the output level associated with each other by the time stamp generation section; and a supervisory signal receiving apparatus comprising: an input level monitoring section into which the multiplexed light is inputted from the transmission line and that measures an input level of the multiplexed light; a supervisory signal termination section that receives the supervisory signal included in the multiplexed light; and a span loss calculation section that detects the hour of the measurement of the input level by the input level monitoring section, stores the input level measurement hour and the input level associating the input level measurement hour and the input level with each other, extracts the output level measurement hour and the output level included in the supervisory signal received by the supervisory signal termination section, and calculates a difference between the input level and the output level at the same hour.