Patent ID: 7079831
Filing Date: 2006-07-18
Classification: H04B

Abstract:
1. A security system, comprising a control panel for communicating with a plurality of peripheral devices, and a plurality of peripheral devices, each comprising a transceiver for transmitting and receiving synchronization data packets on at least one fixed frequency, and transmitting and receiving operating data packets on a plurality of variable frequencies varied according to a frequency hopping sequence assigned by the control panel, the control panel comprising a transceiver for transmitting to and receiving from the peripheral devices synchronization data packets on a plurality of fixed frequencies, and transmitting to and receiving from the peripheral devices operating data packets on a plurality of variable frequencies varied according to the frequency hopping sequence, wherein when a peripheral device is unable to detect a synchronization signal from the control panel during a selected interval, the peripheral device transmits a signal to the control panel at a fixed frequency to notify the control panel that the peripheral device has lost synchronization with the frequency hopping sequence.