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What Is EIRP?
Effective Isotropic Radiated Power (EIRP) restricts the strength of signals sent by a device.
EIRP restrictions vary depending on countries, frequency bands, and channels. Therefore, it is a must to understand EIRP restrictions and requirements in local countries before WLAN planning. The relationship between the EIRP, AP's transmit power, and antenna gain is as follows:
EIRP ≥ AP's transmit power + MIMO gain + Antenna gain - Feeder loss