When copper runs stop short, this converter carries the link farther. StarTech ET90110SM302 extends 10/100 Mbps Ethernet over single-mode fiber up to 30 km, making it a practical choice for remote buildings, distributed facilities, and point-to-point network segments that need distance without a full redesign. The value is in preserving the access layer you already have while moving traffic onto a medium better suited to long spans and electrical isolation. That matters in campus environments, industrial sites, and backhaul links where the cost of replacing endpoints is higher than the cost of adding a conversion layer. SC fiber connectivity gives you a straightforward path for integrating copper Ethernet devices into longer fiber runs. For teams managing legacy infrastructure, this model helps extend service life, reduce disruption, and keep remote links predictable. For procurement, it is the kind of targeted hardware that earns its place by solving a specific network problem cleanly and without excess.