Equipped with 16 XGS-PON & GPON combo ports, DS-P7500-16 can deliver high-performance GPON and XGS-PON access services to subscribers, perfect for medium and small operators. High-Speed Uplink Ports: 2× 100G QSFP28 and 2× 25G SFP28 40G QSFP+ ports offer ultra-fast high-bandwidth uplink. GN25L80B is a combined 2. 25Gbps burst mode limiting amplifier for gigabit passive optical network (GPON) optical line terminal (OLT) applications. The laser driver provides optimum performance with reliable dual loop extinction ratio control and eye-shaping. The OLT is responsible not only for transmitting data from the core network to user terminals but also for managing bandwidth. Optical line terminal (OLT) A device that terminates the common (root) endpoint of an ODN, implements a PON protocol, such as that defined by [ITU-T G. 984], and adapts PON PDUs for uplink communications over the provider service interface.