Move Gigabit Ethernet farther without changing the switching platform. The Advantech SFP-GSM-20K is an SFP transceiver designed for single-mode fiber links using an LC connector and 1,310 nm optics, making it a strong fit for uplinks that need distance and signal discipline. This module is built for environments where copper reaches are not enough and fiber consistency matters. Its SFP form factor keeps deployment simple in compatible switches, while the LC interface supports tidy patching in dense racks and wiring closets. For infrastructure teams, that means fewer compromises when extending links between floors, rooms, or network segments. Use it when you need a dependable optical path for access, aggregation, or inter-switch connectivity. Compared with lower-cost short-reach options, this module is aimed at installations where the fiber plant is part of the design, not an afterthought. That makes it a practical choice for teams that value predictable link behavior and cleaner long-run architecture.