Restarting your router is one of the easiest ways to resolve minor internet speed issues. Often, these devices just need a fresh reboot to clear out temporary glitches and restore your connection to full speed. Wait for about 60 seconds to make sure it fully. Fiber optic networks are celebrated for their speed and reliability, but even the best systems can encounter problems. In many cases, a fiber connection problem originates from one of the following. However, the Data LED is specific to your home network, so if the LED is off, check the Ethernet cable or the router. Fiber, cable, and DSL are wired internet connections, so the best way to check their speeds is to use an Ethernet connection and a wired device. However, despite their remarkable capabilities, fiber.