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220 V power grids Protection

     AC circuits pose a double threat. First of all, acoustic data can be leaked through the AC circuit (220 V). And secondly, there is a threat of information signals leak from office equipment.

     There exist passive and active techniques for AC   (220 V) protection against unauthorized data retrieval.
     Passive 220 V circuits protection implies using anti-interference line filters. Such filters weaken any signals in the frequency band of 0.01-1,000 MHz with the efficiency of at least 60 dB and, thus, do not let the information signals generated in office equipment get through. Besides, a correctly installed filter also protects office equipment from the harmful effect of external interference. It's worth mentioning that efficient operation of anti-interference filters requires high-quality grounding.

    Active AC circuits (220 V) protection techniques imply generation of a noise signal exceeding the information signals and signals of information retrieval devices in level by special generators. Such noise signals are supplied to the 220 V circuit and to the ground circuit. These generators produce noise for 220 V circuits and ground circuits.