[myrandomcomment]

I used to recommend them. Not anymore. My complete home setup is all their kit (the GUI means that if I kick it, the family can likely sort - it is import). I opened a case that a replacement switch (new model, old is EOL) did not work with one of their POE devices. I know this stuff backwards and forwards. I did my testing and basically sent the case to support with all the details (I know this stuff at the ASIC level). Wasted my time for a week. Finally I just said screw it and RMA the switch (nothing wrong with it) because support would not move. I received the replacement and surprise, same issue. Only after that I got the "sorry, we will reach out to L2 support." Wasted my time on a good debug that clearly ID the issue and I had to pay for shipping on RMA. I am stuck with them for now, but as soon as I can find a better offering I am going switch.

(My issue is that I understand that most users are clueless, heck I started in support for Win3.1 for an ISP, but the stuff in the debug clearly was a statement that I understood what I was say, and even as a Jr. engineer 30 years ago, I would have read it and said "hum, this dude knows his stuff, maybe I should ask at the next level").

[cyounkins]

Possibly related: Ubiquiti used non-standard 24V POE for some devices. Plugging standard 48V POE into certain old devices could damage them, and 48V devices won't power on with 24V injectors.

[secureleaf]

This is true, although it's important to differentiate active and passive adapters.

Ubiquiti sells some devices that are 24V passive PoE. These devices include their UISP products (such as devices like the AirMax). Passive injectors are dangerous because they always supply 24V to the port; this could damage a non-24V PoE device.

There's also the 802.3a* standards family, such as the 802.3at (what Ubiquiti calls PoE+). Each of the standards (e.g. 802.3at, 802.3af, etc.) support different amounts of current, but they're all 48V active adapters. Active PoE is safer because the device "requests" the power it wants; the switch does not always supply 48V power over the port, so devices that don't require PoE won't be receiving power.

Ubiquiti sells a few switches that support both 24V passive PoE and 48V active PoE. You can change this in the switch's web interface, through the port settings. You may also want to consider just using a 24V passive injector, especially if your switch cannot be configured to supply 24V power.

[DaiPlusPlus]

To be fair, and AFAIK, I understand there was (and still is?) no ISO/IEC/IEEE standard for "dumb" PoE power, only "smart"/"managed" power.

The rest of Ubiquiti's gear does use IEEE 802.x.

[myrandomcomment]

Thank you for sharing. Unfortunately this is not the issue. I wish it was that simple as they make an adapter for that.

[jcpham2]

Also used to recommend but currently in the process of replacing all APs

Edit: also their stock. Believed in them so much I bought their stock