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Note that there are real 48v 802.3af/at power over ethernet devices where the power source has to assert that the power drain wants the power before it powers u
by somat 3y ago
Note that there are real 48v 802.3af/at power over ethernet devices where the power source has to assert that the power drain wants the power before it powers up and fake "passive" 24v systems where the line is always energized. probably where the GP got the injector from.
My personal involvement on this was several years ago when I was going to buy several unifi access points. It turns out you have to be careful because many of the models advertise as being POE but in reality are jank 24v passive systems. I have not kept up with the current unifi lineup but at the time you had to make sure to get the "AC Pro" to have real 802.3af compatibility.
- mmastrac 3y agoI have a load of Unifi stuff here and it all supports active PoE, but works just fine with passive. The PoE outputs all autonegotiate.
- somat 3y agoEh, it is not like they are outright lying. when you dig into the specs they do say 24v passive. but when someone says poe I expect 48v 802.3af compatible poe. I don't know how true it is but I heard horror stories where ubiquiti 24v gear would activate, then fry when hooked to a real poe source. personally I suspect it was a 48v passive source. I did a quick informal survey of the ui store and it looks like the newest generation(U6) all handles 48v while the prior generation(AC) the pro models were 48v and the lite and long range models were 24v passive.
- youngtaff 3y agoSome of the older Unifi kit was non standard By older I mean you could still buy it three / four (?) years ago