airFiber input voltage

All airFiber radios REQUIRE 4-pair PoE power, so please check that the PoE source you're using deliver power over the 4-pairs. 2-pair PoE sources could create stability issues because of extremely high current over those 2 pairs, so is NOT recommended at all.  
 
Only certain models support -48V power source, supported models are: AF-24, AF-24HD, AF-5/5U.
 
Original airFiber 5X design only supported 24Vdc input. However units with MAC address 04:18:D6:E3:08:E9 or higher support input voltages +19Vdc to +53Vdc.
 
Since airFiber 2X, 3X and 4X have been released after AF-5X, all AF-2X/3X/4X models support up to +53Vdc. But, since it consumes slightly higher power, it requires higher minimum voltage +23Vdc.
 
The AF-11FX comes with a DC input connector, so it can be powered via PoE and/or direct DC cable using the DC input connector.
 
Summary:
 
Model Mac ID Input Voltage Power Required
AF-5X lower than 04:18:D6:E3:08:E9 +19Vdc to +25Vdc Up to 15 Watts
AF-5X 04:18:D6:E3:08:E9 or higher +19Vdc to +54Vdc Up to 15 Watts
AF-2X Any date code +23Vdc to +54Vdc Up to 17 Watts
AF-3X Any date code +23Vdc to +54Vdc Up to 17 Watts
AF-4X Any date code +23Vdc to +54Vdc Up to 17 Watts
AF-11FX Any date code +32Vdc to +54Vdc Up to 35 Watts
AF-24 Any date code +42Vdc to +58Vdc, -48Vdc Up to 50 Watts
AF-24HD Any date code +42Vdc to +58Vdc, -48Vdc Up to 50 Watts
AF-5/5U Any date code +42Vdc to +58Vdc, -48Vdc Up to 40 Watts