Patent ID: 6697327
Filing Date: 2004-02-24
Classification: H04L

Abstract:
An ATM (Asynchronous Transfer Mode) switching system comprising:an input selector for dividing cells inputted from a circuit between an active system switch and a stand-by system switch; a system switching controller which is provided for respective said active system switch and said stand-by system switch respectively in order to execute control of system switching; a cell temporal storage device which is provided for respective said active system switch and said stand-by system switch respectively for storing temporarily therein said inputted cell in every service quality class or in every outgoing destination; a delay priority selector for reading-out the cell with high delay priority successively to output from said respective sell temporal storage device under control of said system switching controller; and an output selector for outputting the cell of said delay priority selector, wherein said ATM switching system causes output of the cell to be execute according to said delay priority selector from the cell temporal storage device of active system when there is no cell whose delay priority is higher than that of the cell stored in said active system according to read-out control of the cell from the cell temporal storage device of stand-by system on the occasion of said system switching, wherein the ATM switching system causes the cell of class of low abolition priority stored in the cell temporal storage device of the active system to be abolished after an elapsed fixed time from commencement of system switching in the condition that the cell with low delay priority is stored in said cell temporal storage device of the active system.