| 摘要 |
PROBLEM TO BE SOLVED: To supply highly accurate clocks to an entire network at all times. SOLUTION: The clock synchronism control system is provided with its own node clock generating section 4 for supplying independent clocks, a priority sequence setting section 7 for placing priority to an internal or external clock, a frame synchronizing section 1 for synchronizing transmission line signals, a priority control information extract section 2 for extracting priority control information from a received frame, a priority control information comparison section 6 that compares the extracted priority with the priority of the priority control information, a priority control information generating section 9 for generating the priority control information, a priority control information transfer section 8 for transferring the priority control information to a downstream node, a clock transmission source information setting section 11 for setting clock sender information to the priority control information, a clock sender identification section 10 for discriminating a clock transmission source on the basis of the clock sender information, and a clock selection section 3 for selecting a synchronizing clock on the basis of the priority of the priority control information and the clock sender information. |
