dBm stands for decibels per milliwatt. While dB is the expression of a gain and is dimensionless,
dBm meaning is a concrete measurement of the power level. It is used to define
signal strength in wire and cables at radio and audio frequencies.
dBm is measured is very small values.
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-50 dBm: This is considered an excellent signal strength. -60 dBm: This is a good signal strength. -67 dBm: This is a reliable signal strength. This is the minimum for any online services that require a reliable connection and Wi-Fi signal strength.
