In most cases, re-seating loose connections or replacing a damaged patch cable solves the issue. Slow Internet Speeds Despite High FTTH PlanFiber optic networks are celebrated for their speed and reliability, but even the best systems can encounter problems. This guide will walk you through diagnosing and resolving common. The easiest way to do is, terminate your ISP connection to single router with at least 2 independent LAN interfaces, then you can build 2 separate networks there.