To set up your router for fiber internet quickly, connect the router to your fiber modem, access the router's settings via a web browser, and input the provided ISP credentials. Make sure to update the firmware, configure Wi-Fi security, and customize your network name for optimal performance. After setup, the technician. Fiber to Ethernet media converters adapt between a typical RJ-45 copper Ethernet cable and fiber-optic cable. If your computer detects an Internet connection, you're ready to set up the router. Here's another "seems obvious" step—but one that will save you aggravation when you're in. If you have subscribed to a fiber optic service and want to configure your PC to enjoy the maximum connection speed, this tutorial is for you.