Patent ID: 6201792
Filing Date: 2001-03-13
Classification: H04L,H04Q

Abstract:
A multicast queue in a data communication device, said data communication device consisting of a plurality of output queues, each output queue associated with an output port, wherein each output port generates a backpressure signal when its associated output queue becomes full, said multicast queue comprising:a multicast tag register having a plurality of bits, wherein each bit is associated with one of said output ports, each bit in said multicast register indicating membership in a multicast group, each output port in said multicast group receiving a copy of each cell output from said multicast queue;a backpressure information register having a plurality of bits, wherein each bit is associated with one of said output ports, each bit in said backpressure register indicating whether or not the corresponding output port is full; anda modified multicast tag register having a plurality of bits, wherein each bit is associated with one of said output ports, each bit in said modified multicast tag register indicating whether the corresponding output port is to receive a copy of cells output from said multicast queue.