Expandable digital switching network (The ITT/Alcatel System 12) U.S. Patent 4,201,891
A distributed control digital switching network is configured as a group switch having a plurality of stages of multiport single sided switching elements for selectively interconnecting a plurality of input terminals via the transmission paths established through the network by path selection control signals which are multiplexed on common transmission links to and through the network together with digitally encoded data from the terminals on common transmission paths such that data is received phase asynchronously at each stage of the network and is either coupled to a higher order stage of the network or folded back through the network by reflection to interconnect terminals switched by the network. The single-sided switching elements are selectively operable as single-sided or multi-sided in accordance with their position in the network.
Lawrence, Alan J.; Cotton, John M.; and Denenberg, Jeffrey N., "Expandable digital switching network (The ITT/Alcatel System 12) U.S. Patent 4,201,891" (1980). Engineering Faculty Publications. 97.
Lawrence; Alan J. , Cotton; John M. , Denenberg; Jeffrey N., Expandable digital switching network (The ITT/Alcatel System 12) U.S. Patent 4,201,891 issued May, 1980