Networked communication devices
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United States of America Patent
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May 6, 2008
Grant Date -
May 25, 2006
app pub date -
Jul 10, 2003
filing date -
Jul 10, 2002
priority date (Note) -
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Abstract
An aircraft emergency lighting system includes a plurality of light units arranged to guide passengers to and to identify exits in an emergency. The light units communicate wirelessly with a remote master control unit operable from the cockpit using a low power spread spectrum signal centered on a single frequency to avoid interference with onboard aircraft control and communication systems. The light units are arranged to receive and transmit any signal to and from the master controller whereby only some of the light units need be within range of the master controller. The light units include battery operated LEDs and cycle between an inoperable (sleep) condition and an operable (awake) condition to conserve power consumption and extend battery life.
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