Communications: electrical – Systems – Signal box type
Reexamination Certificate
2008-07-22
2008-07-22
Tweel, Jr., John A (Department: 2612)
Communications: electrical
Systems
Signal box type
C340S331000, C340S518000, C315S24100S
Reexamination Certificate
active
11446041
ABSTRACT:
An apparatus and concomitant method of reducing the number of synchronization pulses transmitted to the alarm units for increasing the reliability of the overall alarm system is disclosed. The synchronization signal is implemented as a reference or reset signal from which the alarm units derive a reference time to begin activation of the alarm units. Thus, when an alarm unit receives a reference synchronization pulse, the alarm unit applies the reference synchronization pulse as a reference point in time to trigger a series of flashes or audio tones. A second signal sent in close proximity to the synchronization signal is implemented to trigger a second function of the alarm units, such as a silence function.
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Curran John W.
Kosich Joseph
Tweel, Jr. John A
Wheelock Inc.
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