You could try placing a fiber media converter with SPF module at your router outlet. If your streamer has a fiber network connection, you’d connect a fiber cable between the SPF and streamer. If streamer only has ethernet port, you’d have to add another FMC/SPF connection to convert back to wire.
I have two FMCs and it works well, but I can’t say it’s a significant difference over just straight ethernet cable.
I have two FMCs and it works well, but I can’t say it’s a significant difference over just straight ethernet cable.