If it's a PON then it's not Ethernet media. You would then be looking for an ONT SFP but those are far from ordinary SFPs. They are not just dumb devices, there

If it's a PON then it's not Ethernet media. You would then be looking for an ONT SFP but those are far from ordinary SFPs. They are not just dumb devices, there is a lot going on inside them since they crammed a whole ONT into the SFP, and it communicates SFI back to the host equipment as if it would have been Ethernet. https://hack-gpon.org/ont-wo-mac/ https://hack-gpon.org/ont-wo-mac/ You would need the ISP to "adopt" your ONT into their network similar to what is observed with cable modems.