Hello,

I'm looking for a small device that would bring 802.3af PoE, VPN and 2.4/5GHz wifi to a PoE-powered SIP phone allowing some employees to bring their deskphone at home for tele-working.

Current mAP (and a 48V power supply) seems to fit except for 5GHz capability.
All Mikrotik wireless alternatives I looked at seem to require 24V powering which forbids, if I'm not mistaken, 802.af PoE.

Which alternative would suggest ?

Best regards

Reading back mAP datasheet, I would appreciate if someone could confirm the following setup would work or not:

LAN <--- non-PoE ethernet or wifi ---> mAP with 48V power supply <--- 802.af ethernet ---> IP phone

I powered a cAP AC with a PoE injector, then connected a Mitel handset to the POE-out port of the cAP AC and it worked fine. I wasn't necessarily expecting the phone to power up as the cAP AC spec says it's passive PoE out.

I powered a cAP AC with a PoE injector, then connected a Mitel handset to the POE-out port of the cAP AC and it worked fine. I wasn't necessarily expecting the phone to power up as the cAP AC spec says it's passive PoE out.

How did you exactly power your cAP AC device ? Using a 48V power supply connected to provided PoE injector ?

With a no-name 802.3af injector [48v] that had previously been powering the handset directly. I think the cAP AC came with a 24v PSU [can't find it at the moment] so it's unlikely that would have powered the handset.

The idea behind 802.3 af/at handshake is that PSE doesn't apply power to non-compliant PD. cAP ac is 802.3 af/at client, so that PoE injector happily provided power.
cAP ac as PSE is not 802.3 af/at compliant, it can only work according to MT's proprierary passive PoE implementation. It is quite simple implementation (only checks for single inter-wire resistence instead of performing series of checks where PD is supposed to change resistence every time), but incidentally resistence expected by MT PSE corresponds to initial resistence expected by 802.3 af/at PSE. Which means that MT passive PoE will try to power 802.3 af/at PD and if supply voltage is fine for PD, then everything will probably work fine. Things can go wrong if MT is powered with 24V power supply. Whike MT will apply voltage on PoE out port, 802.3 af/at PD won't work due to out-of-range power supply (802.3 af/at requires minimum 37V at PD).

mAP, powered with 48V power supply, will likely behave the same way. If that phone requires less than 24W (PoE out limit of mAP is 0.5A) things should work just fine.

It is quite simple implementation (only checks for single inter-wire resistence

Doesn't sound very "passive" to me :-D

Thanks for the explanation.