The documentation says the MT7988 has 2 X 10 GbE SFP ports, but these must be SFP+ right?
Confusing.
They are SFP+ but compatible with SFP.
They are not 100% backward compatible and some SFP modules (such as TP-LINK SM410U) do not work as expected with the BPi-R4. This is because SFP+ apparently mandates that the module should only be supplied with power if Moddef0 signal is pulled to ground. However, some SFP modules (such as the aforementioned SM410U) only pull Moddef0 once they receive power…
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Would be interesting to know about 10 Gigabit LC transceivers which work…
I expect practically all 10G fiber SFP+ transceivers to work without any issues, only xPON and RJ-45 modules are problematic because they support multiple speeds, draw a lot of power, …