Information security – Protection of hardware – Via power supply
Reexamination Certificate
2006-02-28
2006-02-28
Jung, David (Department: 2134)
Information security
Protection of hardware
Via power supply
C375S211000, C340S870180
Reexamination Certificate
active
07007305
ABSTRACT:
A repeater amplifier boosts weak control signals on a PLC network, with noise discrimination and signal firewall protection. The AC supply voltage is filtered by a high frequency blocking filter to block external noise signals. Operating power for network signaling devices and the repeater amplifier is derived from the clean AC supply voltage. Noise discrimination and signal firewall protection are provided by amplifying and repeating only those receiver pulse signals that (a) have an analog amplitude that exceeds a predetermined analog threshold value, (b) occur during intervals that control data signal modulation is being applied to the filtered AC supply voltage and (c) occur at a frequency within a predetermined frequency band centered on the transmitted power line carrier (PLC) modulation frequency.
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Carson Steven R.
Griffin Raymond T.
Genlyte Thomas Group LLC
Griggs Dennis T.
Jung David
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