Push Gigabit Ethernet farther without adding active transport gear. This 1000BASE-BXU SFP module is designed for single-mode fiber links up to 120 km, using a BiDi optical pair at 1490 nm and 1550 nm to carry traffic efficiently over long campus, metro, and inter-building runs. For infrastructure teams, the value is in preserving port density while extending reach. Instead of redesigning the network around media converters or intermediate aggregation, this SFP drops into compatible Arista platforms and delivers a direct optical path for long-distance connectivity. That makes it a practical fit for environments where fiber plant already exists and uptime depends on keeping the link simple. The BXU wavelength pairing is intended for one-direction transmit/receive operation over SMF, helping reduce fiber count compared with duplex optics. It is a strong choice for remote closets, distributed facilities, and backbone extensions where every port and every strand counts. When the requirement is long reach with predictable Gigabit performance, this module gives you the optical budget and deployment flexibility to keep critical links online.