| 摘要 |
PROBLEM TO BE SOLVED: To warrant phase synchronization among plural synchronization transmitters even on the occurrence of a fault in any of synchronization clock distribution lines with redundant configuration. SOLUTION: Ring distribution lines R0, R1 for 0 system/1 system synchronizing clocks CK0, CK1 are formed by interconnecting a distributed clock system(DCS) 1 and synchronization transmitters 21-2n by distribution lines L00-L0n and L10-L1n respectively as rings. Each of the synchronization transmitters 21-2n relays respectively the 0 system/1 system synchronizing clocks CK0, CK1 but stops a synchronizing clock to be outputted to a succeeding transmitter upon the detection of a fault in the synchronizing clock being received. Thus, on the occurrence of a fault anywhere in the distribution lines L00-L0n and L10-L1n, the synchronizing clock to be returned to the DCS 1 is missing. The DCS 1 receives/monitors the synchronizing clocks CK0, CK1 outputted by itself and in the case of detecting clock missing, the DCS 1 stops output of the missing synchronizing clock. |
