LS2 with a real POE switch?

[jschaffin]

This is probably a dumb question (don't say it!), but I need to get an answer, and a definitive one, if possible.

In the past, during R&D sessions, I have inadvertently burned up LS2s when I connected them to a Passive POE injector that was connected to a 48v power supply. This can get expensive.

I'd like to understand if the LS2 (LS5, Ministation, etc.) can be connected to a standard 802.3af POE switch from say Linksys or D-Link or whomever, without fear of destruction? So far, when I've installed the few that I've installed, I've insisted on using a 12-15v Passive POE injector between the switch and the LSx, and even used non-POE-capable bespoke patch cables between the injector and the switch. This is klugey and time consuming, as you can imagine.

So, I guess this boils down to -- do the embedded Ubnt boards contain the circuitry to properly negotiate with a true 802.3af-compliant POE switch and not get burned up? My understanding is that power negotiation is part of the 802.3af standard, but I am not an electrician (obviously, or I wouldn't have burned up the boards.)

Many thanks for any help. I'm happy to supply any more information needed to help clarify the question.

[jschaffin]

So either nobody can answer this or it really is a unbelievably stupid question. I guess I'll just plug one in.

[IslandTime]

I've seen nothing in the data sheet or on this forum to indicate that the LS2 or other UBNT gear is 802.3af compliant. I haven't tried running one off an 802.3af poe but I expect that doing so will result in a fried board.

[MaximumISP]

They are NOT 802.3af compliant
its 24V MAX (18V recommended) as listed in the data sheets
http://www.ubnt.com/products/ls2.php

You will continue to fry them at 48V

[jschaffin]

Thanks for the confirmations. That's what I knew I hadn't read in the datasheets, but it's always good to have the factory answer.

So, obvious followup -- are there any plans to make the boards 802.3af compliant? I'm sure you can see the obvious benefits in the field. I don't know if it's worth it to Ubnt or not.

[WHT]

So, obvious followup -- are there any plans to make the boards 802.3af compliant? I'm sure you can see the obvious benefits in the field. I don't know if it's worth it to Ubnt or not.That would require an entire rework of the boards and rebranding it as a 802.11af unit, so I can't see that happening.

There are lot of other viable solutions, like a patch panel like interface that lifts the PoE pairs from the 48 volt hub/switch side and drops 18 volts onto the pairs going out to the radios.

[jschaffin]

Agreed. I just don't like the stink-eye I get from rack-builders when I tape up a passive POE injector and string out another wall-wart. I'll have to spec out some of the patch panels you mention.

[WHT]

LOL @ "stink-eye"

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