| 摘要 |
A domestic protective system which utilizes existing household AC power lines to conduct system signals between remote stations or zones and a master receiver. The system signals are established by a single carrier frequency and include a data pulse of this frequency under normal conditions, and no data pulse under malfunction conditions. Locations of zones originating system data signals are identified by time delays established prior to data transmission from each zone, this delay triggered and synchronized by data transmissions transmitted from other zones.
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