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OLT stands for "Optical Line Terminal." It's a critical device in a passive optical network (PON) that serves as the endpoint of the network on the service provider's side. The OLT connects to multiple Optical Network Units (ONUs) or Optical Network Terminals (ONTs), which are located on the customer's premises. OLTs manage and distribute data, voice, and video services over optical fibers, making them a crucial component in delivering high-speed broadband services in fiber-optic networks.
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