nmcli dev wifi signal value is in what units?

CaffeineAddict

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nmcli dev wifi

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I have 2 wifi cards both operating on channel 7 (BSSID grayed out), one has signal strenght of 84, another one has 62.

Q1: What is this value? is it dBi value or some percentage or something else?
Q2: Do my 2 cards interfere with each other since both are up, connected to same gateway and on same channel? (and ofc. close to each other 0.5 metters)
 


1) Normally WiFi signal strength is measured in dBm (decibel-milliwatts) in the range -30dBm (perfect signal) to -90dBm (unusable) but in this particular case it looks more like a comparative percentage of some undefined maximum value (probably -30dBm).

2) Signals from 2 cards in close proximity and operating on the same frequency could interfere with each other.
 

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