Patent ID: 7961091
Filing Date: 2011-06-14
Classification: H04B

Abstract:
1. A method for synchronizing a security system control panel and a sensor, where the security system control panel and the sensor each have a transceiver, the method comprising the steps of: the security system control panel monitoring a publicly broadcast signal for a time signal generated and transmitted by a signal transmitting system; receiving periodically the time signal directly from the signal transmitting system at the security system control panel; calculating a frequency hopping index pointer by the security system control panel using the time signal; accessing a frequency hopping table using the frequency hopping index pointer, the frequency hopping table is used by the security system control panel to determine when to hop between a plurality of different receiving channels and which of the plurality of different receiving channels to hop; and the sensor receiving a time stamp directly from the signal transmitting system and selecting a channel of the plurality of different receiving channels that the security system control panel is then monitoring for signals from the sensor.