So, Mikrotik made these wonderful switches, RB960PGS or hex poe, capable to power 802.11 poe devices, if a 48V power supply is used.
But I would know where is this 802.11af/at compatibility?
If I would power a camera, Hikvision camera, I need to activate poe output "forced ON" , and so I have 48V on eth ports even if there isn't connected any camera.
And this is passive poe, according to me, and not a smart 802.11 poe switch.
If I would power a phone, for example a Grandstream phone, hex poe won't deliver any power to the phone, because "auto ON" doesn't find the phone and "forced ON" finds a strange "overload short circuit" over the eth port where the phone is connected!
And I can ensure that both Hikvision camera and Grandstream phone supports perfectly both passive 48V poe (for example if powered with a RBpoe or RBgpoe and 48V power supply) and 802.11af/at poe (for example powerd by an intellinet or other brand poe switch).
So, where is the poe compatibility?
Why a 2W phone is detected as a short circuit?

For your application the new Mikrotik CRS112-8P-4S-IN is probably a better selection -

https://mikrotik.com/product/crs112_8p_4s_in

For your application the new Mikrotik CRS112-8P-4S-IN is probably a better selection -

https://mikrotik.com/product/crs112_8p_4s_in

So, do you say that CRS112 is really 802.11 at/af compatible and RB960PGS not?
And have I to buy a 8port 179$ switch only to use 2-3 poe ports? Is this a good commercial practice?

What power supply are you using?

The supply that comes with it is only 24v so it will only give out 24v through the ether ports.
If you get a 48v supply and power it with that then it will output 48v (but don't plug any 24v devices into it).

Q1: Can I plug both 24V and 48V PSUs at the same time and make use of PSU failover for the switch itself?

Q2: Can I then power up 24V passive POE devices and 48V active POE devices at the same time? Will 'auto' POE mode recognize them?

Q1: Can I plug both 24V and 48V PSUs at the same time and make use of PSU failover for the switch itself?

Q2: Can I then power up 24V passive POE devices and 48V active POE devices at the same time? Will 'auto' POE mode recognize them?

1) No, there is only 1 PSU socket in the Hex POE, it will take either a 24v jack or 48v jack. I suppose you could power it 48v through the jack and 24v through ethernet but I'm sure there is a reason why you shouldn't do this.

2) No, it will not auto switch, you'd need one of the newer dual PSU devices like the aforementioned CRS112P model to do this.

What power supply are you using?

The supply that comes with it is only 24v so it will only give out 24v through the ether ports.
If you get a 48v supply and power it with that then it will output 48v (but don't plug any 24v devices into it).

I use 48Vdc, the "48POW " unit.
And the behavior is that I said: poe auto on doesn't power either camera and phone, poe forced on powers camera but says "overload short circuit" with the phone.

I was talking about CRS-8P-4S-IN which has two power jacks.