A total of 57 watts is available for the four powered ports 4x PoE. E.g. port 1/ 17 watts, port 2/ 15 watts, port 3/ 12 watts and port 4/ 13 watts.
This is what it says here at Galaxus.
- Intelligent Power Management
As soon as the total power consumption of the PoE-powered devices is greater than or equal to 57W, the PoE ports are prioritised. To protect the system in the event of overload, a decision is then made to distribute the power or switch off the power supply at the port with the lowest priority.
Full duplex means that the connection of the 1GBit Ethernet port from the computer to the switch has 1GBits down and 1GBits up at the same time and that's how they came up with the 2GBits.
Greetings Michael