Are your findings different than the values mentioned?Max current is 1 A per port if input voltage is 18-28 V, 450 mA if 48-57 V. Total limit is 2.8A@24V and 1.4A@48-57V.
Most PDs don't specify current draw, but instead just state max power consumption and that they require 802.3at. According the CRS112-8P-4S-IN documented specs, the switch can provide sufficient power for the PD and it's stated that it implements 802.3at but often there is no way to know if the current output is insufficient until it is tried.On the same page, from where you took that autosensing line, at https://mikrotik.com/product/crs112_8p_4s_in
You find: Max current is 1 A per port if input voltage is 18-28 V, 450 mA if 48-57 V. Total limit is 2.8A@24V and 1.4A@48-57V.
Are your findings different than the values mentioned?
I see nothing wrong here.However, 802.3at allowed Type-1 PSE’s to evolve in ways that gained many of the IEEE 802.3at feature enhancements described above even if they continue to limit minimum output power to the 15.4 watt range.
For reference, where did you find the "minimum required power at PD for at (25.5W)" requirement in the IEEE at standard? Thanks!The problem with spec sheets specifying power consumption is that it's not easy to map that to standard. Standard specifies max current (350 mA for af, 600 mA for at) and also specifies voltage ranges both on output of PSE and input of PD. And indirectly also maximum voltage drop on cable between them. So you need to calculate back and forth between Amperes, Volts and Watts while taking real numbers into account (actual supply voltage, actual voltage drop on cable which depends on actual current draw). Or you can go with worse case from standard: 12.95W max for af or 25.5W max for at but at the same time observing also max allowed voltage drop.
But: if PD requires say 14.5W, does it require af or at? It depends: if cable is short, then af will suffice. With longer cable it requires at.
BTW, at standard allows max 57V. If one manages to get hold of 57V power adapter for MT and considering 450mA limit, this translates to 25.65W ... which is only so slightly above minimum required power at PD for at (25.5W). So with a short cable and when using 57V power adapter, Mikrotiks can qualify as supporting at. OTOH at standard requires PSE output voltage between 50V and 57V which is not possible achieve when using power adapters sold by Mikrotik (nothing above 48V).
All in all, support for IEEE PoE on Mikrot8k devices is far from ideal ...
For reference, where did you find the "minimum required power at PD for at (25.5W)" requirement in the IEEE at standard? Thanks!