NetPower16 feeding AF11FX

Hardware MikroTik hardware general
1

I was testing the setup on the bench, AF11FX as the only device being powered.

theoretically, as per the datasheet, we should be able to sink up to 600MA from the port in 48V, or arround 28Watts.

Input voltage from the PSU is 47.6V.
As the power draw from the device approaches 22W during boot, the poe-out-voltage droops closer to 46.6. (psu voltage stays the same).

at some point close to 22W of sink power, the port is cycled, with the warning:
“poe-out,warning ether16 detected poe-out status: voltage_too_low”

Someone has some insight to share on this?

Netpower 16p Af11-fx Power Issue
2

Cable lengh, category and brand?

Regards

3

This was during bench testing, 1.8M patch-cords of CAT6 cable.

4

According to wikipedia article the PSE (netPower) has quite some constraints about PoE out voltages:

  • when in 802.3 af mode, output voltage should be in range between 44V and 57V. Maximum power is limited to 15.4W.
  • when in 802.3 at mode, output voltage should be in range between 50V and 57V. Maximum power is limited to 30W.

Your measurements clearly indicate that PD (WiFi AP) is a 802.3 at client (power draw exceeding 15.4W) and for that supply voltage should exceed 50V which your power adapter is not providing.

5

You need this:
https://www.balticnetworks.com/tycon-power-802-3af-to-4-pair-60w-passive-gigabit-poe-converter

6

Not necessarily … OP’s PD consumes less than 30W which is well inside 802.1at specs. It’s OP’s power adapter that doesn’t allow him to use at standard (while af standard is up to 15W which is too little for AF11FX).

7

Well, I use the POE-CONV-2AT-60 for AF24 and AF11FX on the netpower16 and it powers them just fine as long as I enable both the master and the slave port simultaneously.