Anti-Tamper Digital Clocks - An Overview
Anti-Tamper Digital Clocks - An Overview
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17. The equipment for detecting clock tampering as outlined in declare 15, whereby the Examine circuit is activated by a clock edge at an end with the clock Appraise time period.
usually means for analyzing that works by using the plurality of delayed monotone signals to detect a voltage fault and
delaying the monotone signal using Just about every of the plurality of resettable hold off line segments to create a respective plurality of delayed monotone indicators Each individual owning possibly a just one or perhaps a zero logic worth; and
twenty five. The strategy for detecting voltage tampering as outlined in declare 23, wherein using the clock to cause the Appraise circuit comprises using a clock edge at an stop with the Examine period of time to result in the Consider circuit.
an Appraise circuit, induced through the clock, that employs the very first plurality of delayed monotone signals or the 2nd plurality of delayed monotone indicators to detect a clock fault.
means for delaying the monotone sign to crank out a plurality of delayed monotone alerts possessing discretely rising hold off times amongst a minimum delay time as well as a maximum hold off time and each from the plurality of delayed monotone alerts acquiring both a just one or maybe a zero logic value;
What's claimed is: one. A method for detecting clock tampering, comprising: offering a plurality of resettable delay line segments, wherein resettable hold off line segments concerning a resettable hold off line phase linked to a minimal hold off time and also a resettable hold off line phase connected with a maximum hold off time are Each and every associated with discretely rising hold off moments;
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four. The method for detecting clock tampering as described in assert one, wherein the Assess circuit decides no matter if the amount of kinds while in the plurality of delayed monotone indicators differs from the water degree number by more than a predetermined threshold.
Proenc’s Anti-Ligature digital clock enclosure has an identical reliable strength that their Tv set enclosures have, the viewing window is thick Lexan and also the front of the unit is secured with considerable safety fasteners. Guarding towards unauthorized obtain.
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Considering that the clock has to be plugged in to function, the CL100 should normally be mounted around an outlet to ensure that the obtain panel covers the outlet (batteries could be utilised being a backup electricity source in the event of electricity outage.)
A monotone sign is delivered throughout an Appraise period of time. The monotone sign is delayed working with Every with the plurality of resettable delay line segments to produce a respective plurality of delayed monotone indicators. A clock is utilized to trigger an Consider circuit that employs the plurality of delayed monotone alerts to detect a voltage fault.
This individual circuit functions like a h2o amount: circuits connected to shorter delay lines website will evaluate a ‘0’ while circuits connected to more time hold off traces will measure a ‘1’. A substantial drinking water stage mark and also a reduced amount mark might function a trigger.