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A GPON OLT (Gigabit Passive Optical Network Optical Line Terminal) is a central device in a fiber-optic network that connects service providers to end-users. It is located at the provider's central office and manages data transmission between the core network and multiple ONTs (Optical Network Terminals) at customer premises. The OLT converts electrical signals into optical signals and distributes high-speed internet, voice, and video services through passive optical splitters, enabling efficient and cost-effective broadband delivery over long distances.