In zero-IF systems, it is derived in the baseband signal chain, before the baseband amplifier. RSSI is often derived in the intermediate frequency (IF) stage before the IF amplifier. However, because signal strength can vary greatly and affect functionality in wireless networking, IEEE 802.11 devices often make the measurement available to users. RSSI is usually invisible to a user of a receiving device. In telecommunications, received signal strength indicator ( RSSI) is a measurement of the power present in a received radio signal. Also shown: signal bars of 2 cellular networks, and signal bars of a Wi-Fi network. Signal strength of -74dBm (or 66 asu) displayed on a smartphone.
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