Maintain dependable fiber connectivity on servers and workstations that need a direct PCIe network path. The Black Box LH1690C-LC-R3 1000 BASE-X fiber PCIe NIC card is designed for LC multimode environments, giving IT teams a straightforward way to add or replace a fiber interface without changing the surrounding network design. This adapter is a strong fit for environments where copper is not the right answer: short-reach fiber runs, electrically noisy spaces, and systems that benefit from a dedicated network path. By using a 1,000 BASE-X interface, it supports Gigabit-class fiber connectivity while keeping the deployment simple and familiar for infrastructure teams. For organizations standardizing on fiber uplinks, this card helps preserve switch ports, maintain clean cabling, and keep server connectivity aligned with enterprise network architecture. It is a focused component for teams that value compatibility, predictable performance, and a hardware choice that fits into established fiber infrastructure.