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RSSI/SNR/Fade Margin

RSSI:
RSSI is the receiver signal strength indicator, RSSI is usually a negative value; the closer to 0, the better. unit dBm.

SNR Signal to Noise ratio:
SNR is signal strength, relative to noise level. The higher the SNR, the better. Unit dB.

Fade margin:

It’s calculated from Received rssi level vs threshold rssi level. Unit dB (+ve value). Higher the value meant by good signal strength.
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