You can plug into either port. The ports are identical. Both ports will power the bridge via 12-24V Passive PoE. The second port is included in case you have multiple Ethernet devices that need to be connected.
You can plug into either port. The ports are identical. Both ports will power the bridge via 12-24V Passive PoE. The second port is included in case you have multiple Ethernet devices that need to be connected.