At the heart of a point-to-multi-point or passive optical network (PON) is the optical line terminal (OLT). Modern OLTs offer communication service providers (CSP) the ability to launch multigigabit services to tens of thousands of subscribers from a single location or just ten. The OLT is responsible not only for transmitting data from the core network to user terminals but also for managing bandwidth. Optical line terminals, also called optical line terminations (OLTs), serve as endpoints for passive optical networks (PONs). What is an Optical Line Terminal (OLT)? In a passive.