Each port may be attached to the boards or network/line cards via a SFP module which must be a OLT module for it to have its Tx and Rx wavelengths swapped, but not all OLTs use SFP modules as shown in the image to the left. Definition: An Optical Line Terminal (OLT), also called an Optical Line Termination, is a network device located at the service provider's central office (CO). It provides two main functions: to perform conversion between the electrical signals used by the service provider's equipment and the. Connected with the front-end (convergence layer) switch with a network cable, converted into optical signals, and interconnected with the splitter at the user end with a single optical fiber. It realizes the control, management, ranging and other functions of the ONU of the user-end equipment. (Most used on routers and switches) ③ST type optical fiber jumper: commonly used in optical fiber. In the world of fiber-optic communication, the OLT (Optical Line Terminal) serves as the “brain” of the entire Passive Optical Network (PON).
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