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Abstract

An output buffer type ATM (Asynchronous Transfer Mode) exchange device and a multicast control method enable retrieval processing to bit map table for the sake of multicast control to delay, and which are capable of answering to be large capacity of the bit map table. The multicast control method of the output buffer type ATM exchange device multiplexes the cell inputted from a plurality of input ports during input cell period. The method accumulates unicast cell from among the cell distributed from a time division multiple bus into output buffer corresponding to the output port respectively. The method outputs the unicast cell to corresponding output port while synchronizing with output cell period. The method accumulates temporarily multicast cell into the multicast cell buffer from among the cells distributed from the time division multiple bus, then, picking the multicast output port information indicating the output port of multicast cell from the bit map table in every output cell period, before implementing output arrangement between every respective output ports obtained as the multicast output port information and the unicast cell accumulated in the output buffer, thus outputting the multicast cell to corresponding a plurality of output ports preferentially.

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