My understanding is that passive PoE has no autosensing capabilities; however, I was surprised to see my hEX PoE automatically power up when I connected it to a CRS112-8P-4S-IN switch.The hEX PoE documentation says it only supports passive PoE for input.
Any idea how the switch detected it should turn power on the ethernet port connected to the hEX PoE? Or does the hEX PoE actually support 802.3af/at for input?
The PoE state on the CRS112-8P-4S-IN ethernet port was set to 'auto on'. I expected that I would need to set this to 'forced on' to power up the hEX PoE but it worked automatically.