A communications system (FIG. 7) couples together a number of entities or communications devices 710 by means of alternating stages (722, 726) of crossbar switches (712, 716) and stages (724, 728) of stride extender coupler circuits, which are preferably in the form of modules (714, 718), together with...http://www.google.fr/patents/US5396231?utm_source=gb-gplus-shareBrevet US5396231 - Modular communications interconnection
