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EMI (Electromagnetic Interference)
Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.
EMI is waves of energy that emanate from electrical devices and cables. The waves may interfere with the proper operation of nearby devices or the proper transmission of signals in nearby cabling systems. Electromechanical devices emit low-frequency waves, while computer chips and other integrated circuits emit high-frequency waves. If the emissions have sufficient energy and are close enough to another device, they will interfere with that device. United States and international regulatory agencies provide standards that ensure that devices do not exceed certain emission levels. The FCC (Federal Communication Commission) regulates emissions in the United States.
Copyright (c) 2001 Tom Sheldon and Big Sur Multimedia.