Importance

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Abstract

A signaling system may include two subsystems that share a common wiring backbone and provide public awareness functions. The two subsystems may be a public address system and a master/slave clock system. Remote rooms at the tail end of the wiring backbone include a speaker and a slave clock. The speakers are in communication with a control device through the wiring backbone. The slave clocks are in communication with another control device at the head end of the wiring backbone. The master/slave clock system superimposes its DC power signal and a time correction signal on the wiring backbone. Each slave clock interfaces the wiring infrastructure through a center tap of a speaker transformer which allows the slave clock to be powered and corrected via the speaker wiring infrastructure.

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First Claim