Optical LAN in Modern Buildings (GPON) Why We're Replacing Copper with Fiber. The Case for Optical LAN in Modern Buildings Why passive optical networks are fundamentally changing how we design infrastructure, for decades, we've built networks the same way. Core switches in the comms room, aggregation switches on every floor, copper cables running to every socket. It works, but it's reaching its limit. The problem isn't the concept. It's the physics. The Copper Ceiling Copper