Hello, I need a switch that has a reserved power supply of 220V and has PoE and SFP modules. It will power MikroTik antennas that are 28V via PoE, however, I am not sure if the switch itself is powered by 220V whether it has the function of regulating PoE from 48V to 28V as in the CRS112 when it is powered by both power supplies. For now, I have settled on the CRS320-8P-8B-4S+RM.
CRS320-8P-8B-4S+RM does not support 28V PoE — it provides a fixed 54V output only.
For your 28V MikroTik antennas, you might want to look at:
CRS328-24P-4S+RM – supports 26V PoE-out
CSS610-8G-2S+IN – supports 28V PoE-out
Both are better suited if you need lower voltage PoE.
But be aware, CSS610 only supports SWOS if that’s important for you.