A digital-data-transmission system includes a network formed from a multiplicity of nodes each having at least three pairs of input/output terminals of which one is connected to an associated subscriber station while the others are connected to respective other nodes so as to enable a binary message...http://www.google.com/patents/US4276643?utm_source=gb-gplus-sharePatent US4276643 - Method of and means for routing binary messages through a multinode data-transmission system
