Ubiquiti airFiber AF-5XHD, Manual

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Link LED
GPS LED
Signal 2 LED will light yellow when on.
Signal 1 LED will light red when on.
Bootup to airOS When powering on, the Power, GPS, Link, and Signal 1-4
LEDs light on. Once the CPU code takes over, the GPS, Link, and Signal 1-3
LEDs turn off. The Signal 4 LED remains on to indicate the boot sequence is
underway.
Initializing airFiber Software When the airFiber application begins to boot under
airOS®, the Signal 4 LED goes from solidly on to a 2.5 Hz flash. This continues
until the AF-5XHD is fully booted.
Signal Level Once fully booted, the Signal 1-4 LEDs act as a bar graph showing
how close the AF-5XHD is to ideal aiming. This is auto-scaled based on the link
range, the antenna gains, and the configured TX power of the remote AF-5XHD.
Each Signal LED has three possible states: On, Flashing, and Off. All Signal
LEDs would be solidly on in an ideal link. If the link has a 1 dB loss, the Signal
4 LED will flash; a 2 dB loss and the Signal 4 LED will turn off. The full bar
graph LED states are shown below.
dB loss
0 -1 -2 -3 -4 -5 -6
-7 -8 -9 -10 -11 -12 -13
Off RF Off
Syncing
Beaconing
Registering
On Operational