Solution for By-Passing Xfinity Fiber-Optic Modem/Router

Uptone etheregen is one option, although only available used at present because of chip shortages. You could go with network switch with optical in capability. You could also remain optical up to  Sonore OpticalRendu. I assume your using usb in on dac?

In order to be of real help, need to know your present network setup in audio system and dac

I don't understand the problem.  Doesn't the gateway have Ethernet connectors on the inside?

I am currently using ethernet from the Xfinity gateway/modem.  I am looking to receive a cleaner signal.  I heard of some high end systems that have done this.