| US 7,468,974 B1 | ||
| Efficient strictly non-blocking multicast switch architecture for time division multiplexed traffic | ||
| Larrie Simon Carr, Anmore (Canada); Winston Ki-Cheong Mok, Vancouver (Canada); and Kenneth Evert Sailor, Saskatoon (Canada) | ||
| Assigned to PMC-Sierra, Inc., Santa Clara, Calif. (US) | ||
| Filed on Sep. 22, 2004, as Appl. No. 10/946,178. | ||
| Claims priority of provisional application 60/503898, filed on Sep. 22, 2003. | ||
| Int. Cl. H04Q 11/00 (2006.01) | ||
| U.S. Cl. 370—388 [370/390; 370/442] | 35 Claims |
| 1. A time division multiplexed (TDM) switch comprising:
an input stage for receiving a current grain group;
an output stage for delivering a previous grain group to a data output; and
a recirculation stage, in communication with the output stage, for recirculating a multicast grain from an output stage output
to an output stage input for delivery at a later time to the data output, providing strictly non-blocking multicast, the multicast
grain being delivered to one output port at a first time and to another output port at the later time, the recirculation stage
comprising exactly 2n−1 recirculation multiplexers, where n is an integer representing a number of ports in the TDM switch.
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