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Chapter 4. Electrical Wiring > Electromagnetic Emission and Power Spectrum Dens...

4.3. Electromagnetic Emission and Power Spectrum Density

4.3.1. FCC Regulation

The emission from electrical in-house wiring caused by a home networking system also needs to be below the limits set forth by the Office of Engineering Technology (OET) under the Federal Communications Commission. There are some specific definitions about using the electrical wiring for the purpose of transmission either over the wiring or through the air. Definitions for carrier current system, incidental radiator, intentional radiator, and unintentional radiator can be found in the text of Code of Federal Regulation title 47, Section 15.3 [7] and are of interest to anyone planning to implement an in-house electrical wiring–based home networking system.

According to Section 15.3, a carrier current system transmits radio frequency energy by conduction over the electric power lines. A carrier current system can be designed such that the signals are received by conduction directly from connection to the electric power lines (unintentional radiator) or reception through the air as a result of radiation of the radio frequency signals from the electric power lines (intentional radiator). An in-house wiring-based home networking system fits the definition of a carrier current system.


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