I’ve RB5009Upr, L009 and Ax3 models. From RB5009, i was trying to power on Ax3 using 48v to 24v PoE convertor. Convertor model is here, https://a.co/d/brduicz And this outputs to 24V and 1A. For some reason Ax3 does not switch ON through this converter, but the same converter is working fine with L009. I already set forced-on for PoE in Rb5009.
Any suggestions?
This is strange,
I’m using a 48V to 24V converter to supply passive PoE to the AX3. It works fine as long as the AX3 is initially powered on using the DC input—once it’s running, I can disconnect the DC input and the AX3 continues to operate using PoE. However, it won’t start up if only the PoE input is connected from the beginning. Given that the AX3 draws only about 8W with no load, why is it unable to start using PoE alone?
Any support?
Are you sure that the 24V/1A are there “no question asked”?
(the device may do some controls. like resistance check before providing the 24 V out)
In theory it should work, but you never know.
You can try using an injector/splitter and a male-male jack cable to power the Ax3 taking the power from your converter, like:
http://forum.mikrotik.com/t/mikrotik-rbgpoe-usable-as-poe-splitter/152794/1
https://mikrotik.com/product/rb5009upr_s_in ==> 802.3af/at PoE-out
https://mikrotik.com/product/hap_ax3 ==> Passive PoE-in
https://mikrotik.com/product/l009uigs_2haxd_in ==> 802.3af/at PoE-in
Converter is 802.3af/at PoE-in, so it implies IMHO 802.3af/at PoE-out therefore L009 is properly powered but AX3 gets wrong type of PoE-in
Not really. it may or may not imply anything, but surely not PoE 802.3af/at as it CANNOT be 24V, only 48V (or so).
Min voltage for 802.3af is 37V (range 37.0–57.0 V)
Min voltage for 802.3at is 42.5V ( range 42.5–57.0 V)
at PD.
In these type of converters the PoE negotiation, if any (on the 48V side) should be done by the converter.
On the 24V side it should be “always on” (if there is power on 48V side), but it could still do some kind of check (like resistance or something else, not 802.3af/at negotiation) before giving out power on the 24V side, and one device (the L009) might pass this test while the other (the Ax3) does not.
Only for the record, it could also be that the L009 (in order to be 802.3af/at compliant) accepts power both as mode A and as mode B, whilst the Ax3 only accepts it (like most Mikrotik passive only devices) only as mode B.
If the converter outputs mode A only, the Ax3 won’t power, BUT this is not the case, because once the Ax3 is powered from jack, the PoE in works.
Yes, i tried with splitter as well using RBGPOE, but its not working. In fact i was always using RBGPOE because i need PoE out for wifi AP which was connected to L009 in Port 8. Basically the setup was, PoE out from RB5009 to power in to L009 using RBGPOE and PoE out from L009 to AP.
Now i was trying to replace L009 and AP by AX3 again using PoE out from RB5009, but not working.
Today i tried another POE splitter from TP-Link(TL-POE10R) and it was success. AX3 works with 12V 1A output from the TL-POE10R.
Good, so the problem is solved 
, though 12V 1A are (in theory) not enough to power an Ax3, the device is rated for 15W, and though those will likely rarely be needed (in practice the real power needed on most Mikrotik devices is at most 2/3 or 3/4 of the max Mikrotik declares) if I were you I would try finding a slightly beefier splitter, 12V 1.5A or 24V 1A, for piece of mind.
Yes as of now, its working fine with very few wifi clients. Will be looking for better splitter having 24V 1A output.