First, connect your router to the fiber modem using an Ethernet cable. This article contains example configurations you can use to help you set up your network with static IP addresses. If you use your own router, you must configure your WAN interface to use. To connect your fiber optic cable to a router, ensure you have the following: Fiber optic modem (ONT): Most fiber connections require an Optical Network Terminal (ONT), provided by your ISP. Fiber doesn't have any issues with lightning or electrical potential changes between buildings, and can handle much higher bandwidth with. There are endless ways to configure a fiber-optic network, but here are a few simple ways to add fiber to your existing network. Your internet service provider (ISP) usually supplies this.