NetMetal takes passive 24V PoE input and can be powered by a passive 24V PoE injector. The cAP ether2 port is supposed to be passive PoE up to 57v. The cAP senses the NetMetal load but the NetMetal will not power up. I have tried auto PoE and PoE on but neither works. Any suggestions about why and s…

Exactly which Netmetal model are you referring to ? I looked at Netmetal AX and it only accepts POE in with 12-28V. Netmetal 5: POE in with 8-30V as input. If you use power adapter from cAP AX, that’s delivered with a 48V PSU in the box. Which means also 48V on POE Out (give or take some differe…

I have a NetMetal AX which, as you say, takes 18-28V passive PoE input. The cAP takes 18-57V af/at input and outputs “Passive PoE up to 57V” per Mikrotik documentation. The cAP is powered by PoE in from a RB5009UPr+S+ which is supplying 48.7V, between 6-9W. I know that passive does not negotiate the…

Primary problem is the applied voltage. If that cAP AX is powered from 48V coming from RB5009, it means there is (give or take) 48V coming out of ether2 on cAP AX. That’s still too high for your Netmetal. So it will not even try to boot. Even if you can solve that voltage problem, you will run in…

This needs to be disambiguated. NO Mikrotik device has any kind of voltage converter. If you supply 48V to it, it will give 48V out (IF it is compatible up to 57 V). If you supply 24 V to it, it will give 24V out. In a nutshell, a PoE in device taking input at 18-28V cannot be powered at 48V, an…

That’s what I am trying to make clear from the beginning …

Yep, I am just trying to strengthen your message. :slightly_smiling_face: BTW, it is loosely point #19 here: [image] GP & CSA for Mikrotik devices Beginner Basics Preamble and disclaimer: The following is a numbered list of what is usually considered good practice or com…

Thanks to both of you. It makes sense that what is supplied is what is output. It was the wording in the MT literature “up to” that confused me. It is true, but would be clearer if it said “will output the input voltage up to 57V”. You both obviously know this but I am a software guy. …

Powering NetMetal PoE from cAP AX ether2

Hardware

jaclaz July 4, 2025, 3:51pm 7

Yep, I am just trying to strengthen your message.

BTW, it is loosely point #19 here: