In the field of telecommunications, a Clos network is a kind of multistage circuit-switching network that represents a theoretical idealization of practical, multistage switching systems. It was invented by Edson Erwin in 1938 and first formalized by the American engineer Charles Clos in 1952. By adding stages, a Clos network reduces the number of crosspoints required to compose a large c. TopologyClos networks have three stages: the ingress stage, the middle stage, and the egress stage. Each stage is made up of a number of crossbar switches (see diagram below), often just called crossbars. The network im. The relative values of m and n define the blocking characteristics of the Clos network. If m ≥ 2n−1, the Clos network is strict-sense nonblocking, meaning that an unused input on an ingre.
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