| 摘要 |
<p>PURPOSE:To suppress the generation of slip phenomena by selecting the most accurate clock source by a controller based on the subordinate destination information of the clock from a control signal line. CONSTITUTION:A control part 20 switches a switch 11 so that it can select the most accurate clock source based on the subordinate information of the clock from a control signal line 10. That is, the system which is not in synchronism with the master clock does not operate immediately by itself but recognizes the master clock by a control signal being exchanged between systems by using the control signal line and receives the clock signal from a master node 1 or from a slave node 2 of the other system in synchronism with the master clock. Thus, the master clocks from a main station 3 are supplied to each system as much as possible and the clocks can be unified. Thus, the generation of the slip phenomena can be prevented.</p> |
