| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve accuracy for phase synchronization of reference clock between a working system and a standby system. <P>SOLUTION: A reference clock supply system is configured by a redundant structure of a clock supply circuit for the working system and a clock supply circuit for the standby system. The working system supplies a first reference clock, while the standby system supplies a second reference clock phase-synchronized to the first reference clock. The phase difference correction circuit includes a phase difference measurement portion. The phase difference measurement portion measures a phase difference between the first and the second reference clocks on a side which receives the first and the second reference clocks from the reference clock supply system, and feeds back information on the phase difference to the reference clock supply system. The phase difference correction circuit makes correction to phase synchronization operation for the first and the second reference clocks by the reference clock supply system, according to phase difference information. <P>COPYRIGHT: (C)2009,JPO&INPIT |
