| 摘要 |
<p>PURPOSE:To make the synchronization stable at a high speed by preventing a trunk line network from selecting a peripheral network whose synchronization is unstable by mistake. CONSTITUTION:A trunk line network 10 and peripheral networks 20, 21, 22 connecting to the network 10 make communication synchronously with a clock inputted to any of the peripheral networks 20, 21, 22 in the communication system. Even when the peripheral networks 20, 21, 22 receives a clock from the trunk line network 10 and synchronously with the trunk line network 10, the monitors the clock inputted from an external network 100 directly and sends the state to the trunk line network 10.</p> |
