Abstract: Disclosed is a clock distribution device and method in a compact PCI system based multi-processing system. A compact PCI based multi-processing system preferably includes processing signals upon mounting various circuit boards on multiple slots, even if the location of the system slot is varied, the skew of clocks transmitted to the other slots may be minimized. Accordingly, the system may be configured in a flexible manner because of such variability of the system slot's location. Further, the system may be efficiently repaired and maintained because it is possible to easily and quickly take measures in response to any failure occurring on the board mounted on the system slot.

Abstract: A duplexing structure of a switching system processor in which a duplexing channel is formed through a back plane to implement duplexing in an active mode and a standby mode includes first and a second processor boards for which a duplexing channel is formed through a back plane and being dually operated in an active mode and in a standby mode, wherein each processor bus connected to a microprocessor of a processor board at one side, and a duplexing channel connected to a processor board at the other use a different clock so that the two processor boards are independently operated.