Extend fiber connectivity where space, weight, and power constraints rule out larger hardware. The Black Box LMC401A is a compact multimode fiber media converter designed to move Ethernet between copper and fiber in environments that need a small footprint and dependable transport. Its 5 km multimode reach gives network teams room to connect across buildings, equipment rooms, and distributed work areas without moving to a more complex optical platform. The ST interface is a familiar choice in legacy and mixed infrastructure, which makes this model useful when you need to preserve existing fiber terminations rather than replace them. This converter is also a strong fit for mobile or temporary deployments. When the job calls for fiber at the desktop, in a lab cart, or in a space where AC or DC power is limited, the compact form factor helps keep the installation simple. For organizations that value practical interoperability over oversized feature sets, the LMC401A delivers the reach and physical flexibility needed to keep fiber links in service.