Ubiquiti PowerBeam AC PBE-5AC-620 Quick Start Manual page 4

LEDs
Power
device is connected to a power source.
Ethernet
when an active Ethernet connection is made and
flash when there is activity.
Signal
value for the wireless signal strength LEDs on the
Wireless tab under Signal LED Thresholds. Each LED
will light when the wireless signal strength is equal
to or greater than the LED's threshold value. The
default threshold values for these LEDs are shown
below:
The Power LED will light blue when the
The Ethernet LED will light steady blue
In airOS®, you can modify the threshold
-65 dBm -73 dBm -80 dBm -94 dBm