A three-stage network is operated in strictly nonblocking manner in accordance with the invention includes an input stage having r1 switches and n1 inlet links for each of r1 switches, an output stage having r2 switches and n2 outlet links for each of r2 switches. The network also has a middle stage...http://www.google.com/patents/US20050063410?utm_source=gb-gplus-sharePatent US20050063410 - Strictly nonblocking multicast linear-time multi-stage networks
