A bi-directional communications system for bypassing a local exchange carrier telephone system for conveying data between at least one terminal unit and a switching unit that has the functionality of a Class 5 central telephone office switch that is connected to a public switched telephone network. The...http://www.google.fr/patents/US5926479?utm_source=gb-gplus-shareBrevet US5926479 - Multiple protocol personal communications network system
Multiple protocol personal communications network system
