Help with passive POE and Netgear GS728TPv2

Hardware MikroTik hardware general
1

I have two CAP ax and they work great with the 802.3at port on my netgear core (home) switch.

I also have two hAP ax2’s. Those are spec’d as “passive POE” with voltage limits of 18-28v.

In the Netgear i have choices, including 802.3af, 802.3at (reasonably self explanatory) and also:

Legacy: Powered using high-inrush current, used by legacy PD’s requiring more than 15w to power up

Pre-802.3at: Initially powered in 802.3af mode, after 75ms then 802.3at mode.

There is a voltage column in the settings but you cannot set it, it appears to be reported only. There is no indication in the manual what voltage is used, or any way to control it, or what “legacy” means in terms of voltage.

I plan to wall mount these hAP ax2’s allowing them to be small switches for TV’s (back to back in different rooms), which work better wired. I can use an adapter of course, but it would be very nice to power them from POE as then their AP aspect has a UPS from the core switch’s UPS.

I prefer not to smoke my hAP ax2’s.

Am I correct that these are simply not compatible, or does the “legacy” likely work?

And probably rhetorical but why on a nice shiny new standard device like the hAP ax2 can’t the POE be active standards conforming like the CAP’s? :frowning:

Linwood

PS. I have a couple of unused power injectors for the CAP ax, which don’t specify a standard, but I assume since the brick that came with it is 48v that those are also 48v and so can’t be used (e.g. from the switch end)?

2

AFAIK the Netgear only provides nominal 48v, the options change the initial negotiation. You can use an 802.3af/at to 24V passive converter - either the Mikrotik RBGPOE-CON-HP, or Ubiquiti INS-3AF-I-G (can only provide a maximum of 12W so OK as long as you don’t have power consuming devices plugged into the ax2)

3

Thank you. Only providing 48v is perhaps consistent with no way to set it, but kind of weird that it has a column to show voltage.

But those converters look like a solution, albeit 30% the cost of the hAP ax2. But solves the problem. Thank you.

4

It maybe that the PSE controller provides voltage, current and power information and they choose to display it. Certainly some other vendors 802.3af/at-only switches do so.

There are other converters, e.g. PoE Texas / PoE World have a huge range for a variety of uses https://shopify.poe-world.com/collections/poe-splitter - the GAF-24v24w would also be suitable.