| 摘要 |
PROBLEM TO BE SOLVED: To provide a time synchronous system in which it is not required to possess the function of measuring a delay time every slave station and, thus, a parent station successively connects the line with the slave stations for time setting while preventing the increase in cost of each slave station single body, whereby it is not required for each slave station to connect the line to the parent station for time setting. SOLUTION: A parent station 1 is provided with the function of measuring the delay time of a line, and each slave station 2 is provided with the function of forming a loop back circuit 2b when the parent station 1 measures the delay time of the line. The parent station 1 loops back the slave station 2 to measure the delay time of the line, and transmits the time information including the delay time and a reference time to the slave station 2. The slave station 2 calibratees the time on the basis of the time information. Further, the parent station 1 successively executes the measurement of delay time and the transmission of the time information to each slave station 2. |
