Fiber optic modem (ONT): Most fiber connections require an Optical Network Terminal (ONT), provided by your ISP. Compatible router: Verify that your router supports fiber optic input (look for an SFP or WAN port labeled "ONT" or "Fiber"). Fiber optic internet delivers blazing-fast speeds and reliable connectivity, making it a top choice for modern homes and businesses. However, setting up a fiber optic connection to your router can seem daunting if you're unfamiliar with the process. This comprehensive guide combines industry standards with field-tested practices to ensure you achieve a rock-solid. Fiber optic internet is generally installed in the following 5 steps, which we'll dive deeper into throughout the article: A technician checks your area and prepares the connection from the neighborhood fiber network. This can be done in two ways: Underground Installation – Fiber cables are placed in conduits underground, offering better protection from weather and physical damage. You need a modem or ONT to do so.