| 摘要 |
PROBLEM TO BE SOLVED: To overcome such a problem that, when precision of a line clock is superior and a deviation between the line clock and a PPS signal is small, a synchronization of a frame signal can be maintained without correcting the deviation of an internal clock depending on the line clock, but when precision of the line clock is bad and the deviation of the internal clock is large, managements of re-synchronous times in absolute base stations do not agree between the respective absolute base stations, and a re-synchronization cannot simultaneously be conducted at the same time, and the synchronization of the frame signal cannot be maintained. SOLUTION: Before a phase of a frame signal is adjusted on the basis of a PPS signal, absolute base stations 17 to 19 adjust an internal clock operating on the basis of a line clock based on a time setting signal transmitted from a maintenance terminal 13. |
