The closer to 0 dBm, the stronger the signal. However, -70 dBm and higher values usually equate to the modem being in an excellent coverage area. The exact numbers vary between cellular carriers. The higher the number, the better the signal. This value relates to the signal strength of the cellular signal from the tower to the modem. The RSSI is indicated by a negative dBm value. In telecommunications, Received Signal Strength Indicator (RSSI) is a measurement of the power present in a received radio signal.
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