An acronym for Optical Line Terminal. The OLTOLT An acronym for Optical Line Terminal. The OLT is designed to deliver data to the end customer and is used to connect fiber-optic trunk lines. It performs two essential functions: for the upstream, it completes the upstream access of the PON network; for the downstream, it sends and distributes the acquired data to all terminal devices. is designed to deliver data to the end customer and is used to connect fiber-optic trunk lines. It performs two essential functions: for the upstream, it completes the upstream access of the PONPON PON stands for Passive Optical Network, which describes all types of optical networks that have no active equipment between the start and end point. One of these is the network used to bring the fiber-optic link to the end-user by means of point-to-multipoint architecture in which a single fiber is used to reach several recipients via non-powered optical splitters. networkNetwork In computer language, the term network defines a set of hardware and software devices which, when linked together, enable the exchange and sharing of resources, data or information. In a computer network, the devices that generate, route and terminate data are called network nodes.; for the downstream, it sends and distributes the acquired data to all terminal devices.