I have router to D Link switch with RJ45 to optical isolator with fiber converter via fiber optic to fiber converter on EtherRegen input out, via ViaBlue RJ45, into Auralic G2 streamer.
This is the optical isolator(fiber media converter).
Gigabit Ethernet Multi-Mode LC Fiber Media Converter (SFP SX Transceiver Included), up to 550M, 10/100/1000Base-Tx to 1000Base-SX https://a.co/d/e6VoowN