US Patent 7207724 Connector and receptacle containing a physical security feature

A network comprising: (a) a plurality of different receptacles for facilitating a connection to different information networks requiring different access authorization, each different receptacle optically or electrically coupled to one and only one different information network, each different receptacle having an inner surface with a unique first geometry; and (b) a plurality of different plugs for optically or electrically coupling with the different receptacles, each different plug having a unique second geometry, each unique first geometry corresponds to one, and only one, unique second geometry of a plug such that plugs and receptacles having corresponding unique first and second geometries are mating pairs.