QNAP QSW-2104-2T
This switch synchronises perfectly at the expected speeds (10, 2.5, 1 gb) with the coloured LEDs showing the connection quality.
At 2.5 gb, copies are made at more than 300 MB/s, making ISCSI disk backups really usable.
Even with cat 6A S/FTP cable.
The power consumption is 4.5v idle, for a 1 Gb port it is 0.2v, for a 2.5 Gb port it is 0.7v, and for a 10 Gb port it is 1.2v
It's a pity that it's not manageable, with for example a vLan management.
Very stable even in hot weather.
To be recommended, if you really want to saturate your fibre speed...