The switching points in the topology are called crossbar switches. In this paper he described how telephone calls could be switched with equipment that used multiple stages of interconnection to allow the calls to be completed. He published a paper titled "A Study of Non-blocking Switching Networks" in the Bell System Technical Journal in 1953.
It is fascinating how concepts reemerge again and again in the history of networking.Ĭharles Clos was a researcher at Bell Laboratories in the 1950s. This concept has been around for many years and it is now a key architectural model for data center networking. Now Clos networks are being used in modern data center networking architectures to achieve high performance and resiliency. Clos networks evolved into crossbar topologies and eventually into chassis-based Ethernet switches using a crossbar switching fabric. Clos networks were first created in the mid-1950s as a method to switch telephone calls.
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