| 摘要 |
<p>PURPOSE:To improve the reliability of a system by providing a duplex synchro nizing device and a duplex constitution in-system device and connecting selectors crosswise. CONSTITUTION:Connecting constitution is formed in such way that the synchro nizing devices 1-0 and 1-1 output system clocks from system clock generating parts 2-0 and 2-1 selectively by the selectors 3-0 and 3-1, and the selectors 3-0 and 3-1 are connected to the selectors 5-0 and 5-1 in the in-system devices 4-0 and 4-1 crosswise. Since switching between a system in use and a standby sys tem can be performed independently on the synchronizing devices 1-0 and 1-1 side, and the in-system devices 4-0 and 4-1 side, a maintenance work can be performed easily. Also, since it is possible to control selectively the distribution path of the system clock, the distribution of the system clock can be continued without generating system down, when a various kinds of faults including a cable fault, etc., and generated. In this way, the reliability of the system can be improved than ever.</p> |
