| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure a transmission delay difference from a first processing unit to multiple second processing units.SOLUTION: Multiple second processing units 20A, 20B respectively include: counters 22A, 22B for counting a counting value being the same as a value in the other counter in the other second processing unit; registers 23A, 23B for holding counting values of the counters 22A, 22B; and control units 24A, 24B for allowing the registers 23A, 23B to hold in-reception counting values by the counters 23A, 23B when a measurement indication is received from a first processing unit 10, and notifying the first processing unit 10 of in-reception counting values held by the registers 23A, 23B. The first processing unit 10 calculates a difference between in-reception counting values respectively notified from each one of the second processing units 20A, 20B as a transmission delay difference from the first processing unit 10 to each one of the second processing units 20A, 20B. |
