How Cellular modem gives out the value depends on the manufacturer and its interpretation.
How Cellular modem gives out the value depends on the manufacturer and its interpretation.
https://i.imgur.com/Tu17wZP.png
https://i.imgur.com/Tu17wZP.png
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=== Note taken ===
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I've modified the description by adding a sentence that RSSI values represent a relative signal strength measurement whose actual meaning depends on the measuring device==