A modem which includes an application interface for receiving packets to be transmitted on an electrical power network, a network interface connecting the modem to the electric power network, at least one media access control (MAC) unit adapted to perform MAC layer tasks in accordance with at least two...http://www.google.es/patents/US20040174851?utm_source=gb-gplus-sharePatente US20040174851 - Dual purpose power line modem
