Support long-reach Gigabit Ethernet links with this Cisco 1000BASE-BX80 SFP tuned to 1490 nm. Designed for bidirectional single-fiber operation, it is a practical fit for access networks where fiber count is constrained and the link budget must carry real distance. The BX80 class is built for environments that need to connect remote buildings, aggregation points, or campus edge sites without pulling additional strands. By using a single fiber for transmit and receive, it helps preserve plant capacity while keeping the deployment aligned to Cisco optics already specified in the network design. As a remanufactured module, it offers a more economical path to maintaining installed infrastructure without changing the optical architecture. That matters when the cost of a replacement optic is only part of the equation; the larger value is keeping the link stable, the spare strategy simple, and the procurement process tied to a known Cisco MPN. Choose it when distance, fiber conservation, and lifecycle cost all matter at once.