StarTech Gigabit Ethernet to Fiber Media Converter, 1000Base-SX SC, 550m

This StarTech unit does one job and does it cleanly: it takes a standard RJ45 Gigabit Ethernet connection and pushes it out over multimode fiber with an SC connector. The copper side auto-negotiates 10/100/1000 Mbps and handles auto MDI/MDI-X, so it links to a switch, router, or patch panel without any cable juggling. On the fiber side it runs 1000Base-SX up to 550 m on 50/125 um multimode, which is well past the 100 m ceiling you hit with plain copper. The metal case is wall-mountable and has clear LED indicators for power, copper link, and fiber link, which makes troubleshooting a dead segment quick. It ships with a 5V DC adapter. The main thing to plan for is symmetry: you need a matching converter or a switch with an SC fiber uplink at the far end, and each end needs its own power outlet. This model uses a fixed SC multimode port, so if you later want single-mode or a different connector, you swap the whole unit rather than the optic. 99 this is a fraction of the typical $40 to $60 street price for a Gigabit media converter. For a spare in the toolkit or a one-off building-to-building run, there is no reason to hesitate.