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RSSI is usually invisible to a user of a receiving device. However, because signal strength can vary greatly and affect functionality in [[Wireless LAN|wireless networking]], [[IEEE 802.11]] devices often make the measurement available to users.
RSSI is often derived in the [[intermediate frequency]] (IF) stage before the IF amplifier. In [[Direct-conversion receiver|zero-IF systems]], it is derived in the baseband signal chain, before the baseband amplifier.<ref>{{Cite book |last1=Foerster |first1=Anna |url=https://books.google.com/books?id=wgmhDwAAQBAJ |title=Emerging Communications for Wireless Sensor Networks |last2=Foerster |first2=Alexander |date=2011-02-07 |publisher=BoD – Books on Demand |isbn=978-953-307-082-7 |page=241 |language=en}}</ref> RSSI output is often a DC analog level. It can also be sampled by an internal [[analog-to-digital converter]] (ADC) and the resulting values made available directly or via peripheral or internal processor bus.
== In 802.11 implementations ==
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