| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent generation of a high load of time information acquisition request to an NTP (Network Time Protocol) server, even when power sources of many devices are switched to the on-state simultaneously at a power failure restoration time of a commercial power source, concerning a time information acquisition method and a device by NTP. <P>SOLUTION: A time interval for starting acquisition of time information to an NTP server 4-3 from the point of time when the power source of each device 1-1 is switched to the on-state is determined following a value of a random function generated in own device at every time when the power source is switched to the on-state, and acquisition of the time information is started to the NTP server 4-3 after elapse of the time interval from the point of time when the power source of the own device is switched to the on-state. Otherwise, the time interval is determined by using low-order bit values of either or both of an IP address and an MAC address of the own device, and after elapse of the time interval, acquisition of the time information is started to the NTP server 4-3. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
