What is the main function of the Optical Line Terminal (OLT) in a PON?

• A. It terminates the optical network at the customer premises
• B. It acts as the service provider's centralized controller that manages ONUs/ONTs
• C. It amplifies the optical signal along the fiber
• D. It provides wireless access to users

Answer: (B)

In a PON, the Optical Line Terminal sits at the service provider’s central location and acts as the centralized controller for the network. It coordinates all the ONUs/ONTs, scheduling upstream transmissions from each user and managing downstream data delivery, while enforcing bandwidth, QoS, and security policies. This centralized control is what enables many subscribers to share a single optical fiber through passive splitters without active amplification or local wireless access.