Keep Fast Ethernet links alive where copper alone falls short. The Black Box LIC022A-R4 converts 10/100BASE-T copper to 100BASE-FX multimode fiber, giving you a practical path for extending network segments across longer distances and electrically noisy spaces. Built around 1,300 nm multimode optics and an ST fiber interface, this converter is suited for straightforward point-to-point deployments where stable transport matters more than added complexity. The 2 km reach gives infrastructure teams room to connect closets, production areas, and remote equipment without redesigning the network around a full switch refresh. For environments that still depend on Fast Ethernet endpoints, this model preserves existing investments while adding the isolation and distance benefits of fiber. It is a focused choice for teams that need reliable media conversion, not extra features they will never use. That simplicity is part of the value: fewer moving parts, cleaner migration paths, and a lower-risk way to extend service across the plant, campus, or building backbone.