A communications system has a plurality of stations (S.sub.1, S.sub.2 . . . S.sub.N) interconnected by a pair of lines (10,11) so that one line (10) permits the stations (S.sub.1, S.sub.2 . . . S.sub.N) to transmit in one direction and the other line (111) permits transmission in the other direction....http://www.google.es/patents/US5111456?utm_source=gb-gplus-sharePatente US5111456 - Apparatus and method for communicating data between a plurality of stations
Apparatus and method for communicating data between a plurality of stations
