Patent ID: 6480578
Filing Date: 2002-11-12
Classification: H04M

Abstract:
A broadcast system for sending a message signal over at least one communication link to at least one of a plurality of potential receivers, the system comprising:a transceiver system at a central location that receives a notification signal identifying a designated line of the at least one communication link and that transmits the message signal over the at least one communication link to the at least one of the plurality of potential receivers on the designated line; an alarm device, associated with the at least one of the plurality of potential receivers that receives the message signal at a user location and that issues an alarm signal at the user location in response thereto, the alarm device comprising: an alarm indicator; means for demodulating a data signal received over the at least one communication link; means for parsing a received data packet contained in the data signal to identify if the data packet is of an emergency alert type; means for activating the alarm indicator at a user location according to a control word parameter contained in a modulated data signal, the modulated data signal comprising a unique data signal distinct from telephone supervisory signals and independent of call status; and means for providing at least one of a plurality of messages based on a parameter message contained in the modulated data signal.