| 摘要 |
PROBLEM TO BE SOLVED: To suppress fluctuation in a frequency and a phase of a clock signal at system changeover attended with maintenance when clock signal supply sections consisting of 1st and 2nd systems and adopting the duplicate configuration enter a hold-over state through interruption of a clock path. SOLUTION: A branch output of a synchronization section 40 of a 1st system 10 is given to an input selector of a synchronization section 41 of a 2nd system 11 and a branch output of a synchronization section 41 of the 2nd system 11 is given to an input selector 30 of the 1st system 10 through a crossing loopback route, and as soon as a hold-over state is entered, an output clock signal of an active system is fed to a standby system so as to synchronize the standby system with the active system at all times. |
