COMMUNICATION SYSTEM, MANAGEMENT APPARATUS, COMMUNICATION APPARATUS AND COMPUTER PROGRAM

摘要

In a ring type network, a master node transmits a determination packet to a slave node; receives the determination packet having taken a round of a plurality of slave nodes; stores determination packet transmission and reception times in accordance with the timings of an internal clock; and transmits a transmission result notifying packet, which is indicative of the determination packet transmission and reception times, to the slave node. Each of the slave nodes receives the determination packet; transmits the received determination packet to a next node; stores a determination packet reception time in accordance with the timing of an internal clock; also receives the transmission result notifying packet; calculates a time correction value by using the determination packet transmission and reception times indicated by the received transmission result notifying packet, the stored determination packet reception time, the total number of the node apparatuses and using a difference in packet transfer order between that slave node and the master node; and corrects the time of the internal clock by using the calculated time correction value.