| 摘要 |
In a system performing a delay measurement between a master device and a slave device, a master device transmits a delay measuring signal at a fixed timing relative to a synchronous pattern signal in an overhead and transmits a frame signal in which an internal delay time, associated with a frame signal generation, from a delay measurement start timing to a transmission timing of the delay measuring signal is stored in the delay measuring signal as a master offset value; and a slave device adds an internal delay time of its own device associated with a frame signal generation to the master offset value after having received the frame signal to make a slave offset value and transmits a frame signal in which the delay measuring signal is updated with the slave offset value; the master device calculates a delay time between both devices by subtracting the slave offset value from a time difference between a timing at which the delay measuring signal within the frame signal transmitted from the slave device is received and the delay measurement start timing.
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