NO-HIT SWITCHING DEVICE AND SWITCHING METHOD FOR DELAY PRIORITY CONTROL BUFFER

摘要

PROBLEM TO BE SOLVED: To provide a no-hit switching device and switching method of a delay priority control butter for guaranteeing the accurate delay priority order of the output order of cells at the time of no-hit changeover. SOLUTION: This device is provided with an operation system buffer part 10 and a standby system buffer part 20. The operation system buffer part 10 is provided with plural priority buffers 11-1n and the respective priority buffers 11-1n are provided with a cell retaining amount computing circuit 115 for outputting retaining amount information signals for indicating the retaining of signal cells corresponding to the input of the cells for phase matching. The standby system butter part 20 is provided with the plural priority buffers 21-2n corresponding to the priority buffers 11-1n of the operation system buffer part 10 and the respective priority buffers 21-2n are provided with a read start address computing circuit 216 for controlling the read of the signal cells from the priority buffers 21-2n corresponding to the staying amount information signals outputted from the cell staying amount computing circuit 115 of the corresponding priority butters 11-1n.