Advanced explanation:
RSSI (Received Signal Strength Indicator) is a measure of the strength of a received radio signal. It is a relative value that indicates how much power a receiver registers in the respective frequency band.
RSSI is usually given in dBm (decibel milliwatts), with higher negative values indicating a weaker signal strength – for example, an RSSI of -50 dBm is stronger than -90 dBm. The exact value range and interpretation may vary depending on the technology and manufacturer.
RSSI plays an important role in evaluating reception quality, for example when establishing a connection, selecting the best access point or mapping signal strength. However, it is not a direct indicator of transmission quality, as interference and noise are not taken into account.