[notes]
dB - attenuation/amplification of the power level - expressed as the base 10 logarithm of the ratio of the power of two signals, as shown here:
dB = 10 x Log10 (P1/P2)
dBi - power gain rating of antennas
dBm - uses same calculations as dB, but has a reference value of 1mW. Can also describe receiver sensitivity in -dBm.
Data networks: AP separation of 120-130 feet
Voice networks: cell
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