Many fiber internet problems come from dirty connectors or loose plugs, not major faults. Power cycling or restarting your ONT (Optical Network Terminal) often resolves simple troubleshooting internet issues. These high-speed, high-capacity communication networks are increasingly replacing copper cables, offering superior performance and. Fiber optic networks are celebrated for their speed and reliability, but even the best systems can encounter problems. First, check the basics—look for power issues on your optical network terminal and inspect all cables for visible damage. Power. FTTH is what we call fiber-optic communication, which has now entered thousands of households and provides 100 Mbps or 1 Gbps network speeds for home internet access, making it easy to enjoy the benefits of the internet. However, what should we do if the fiber distribution box fails? What are the. The fiber distribution box—sometimes called a fiber box or internet distribution box—is the point where feeder cables from the central office connect with distribution cables going to individual users.