| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable each node to comprehend the power source supplying state of the other nodes in a network by allowing each node to inform the other nodes of the change of the supplying source of a power source, when it is changed. SOLUTION: An interface provided for each node is formed of an LINK chip 1 and a PHY chip 2. The chip 1 is supplied with a power source from a power source device provided for the node. The chip 2 is supplied with power from an external power source device or the power source device provided for the node. Then, when its own power source device is down, power is supplied from the external power source device. A reset IC 3 outputs a pulse at the time of interrupting and returning power supply to the chip 1. When the pulse is inputted to the reset terminal R of the chip 2, the node informs the other node of its own state, including the state of the power source through the network.</p> |
