When copper distance limits get in the way, the Black Box LMC403A gives you a direct path to singlemode fiber. It accepts 10/100/1000-Mbps copper and converts it to 100-Mbps singlemode fiber, making it useful where a slower fiber handoff is acceptable but reach is critical. With 1310 nm optics and support for distances up to 30 km, it is suited to long inter-building links, remote facilities, and distributed network endpoints. The ST connector keeps the fiber side straightforward for installations that already standardize on that interface. On the copper side, support for 10/100/1000-Mbps input adds flexibility when connecting mixed-speed equipment or upstream switches. That makes the LMC403A a practical choice for extending service without replacing stable infrastructure just to satisfy a distance requirement. For teams balancing cost, reach, and compatibility, this media converter offers a focused way to preserve connectivity across long spans. It is a disciplined solution for environments where the network design calls for singlemode transport, predictable conversion, and a clean transition from copper to fiber.