The ODN is the optical transport path that connects the OLT to ONUs/ONTs using passive optical components. It forms the backbone of the PON architecture. The ODN can typically cover distances up to 20 km or more, depending on the network design. In the age of fiber-to-the-home (FTTH) and ultra-broadband connectivity, the Optical Line Terminal - or OLT - is one of the most crucial devices powering our high-speed digital world. When you stream a 4K video, join a remote meeting, or play an online game on a gigabit fiber connection, an OLT. Gigabit Passive Optical Network (GPON) is a communications technology for Fiber-to-the-Home (FTTH) broadband installations. Control Board: Coordinates data flow. The OLT is responsible not only for transmitting data from the core network to user terminals but also for managing bandwidth. They convert optical signals from the fiber line into electrical signals that your devices can understand.