Keep critical 1 Gb connections alive across distances that standard optics cannot cover. This Accortec 1000BASE-BXD SFP module is built for single-mode fiber deployments that need up to 120 km of reach, making it a strong fit for metro aggregation, campus interconnects, and long-distance point-to-point links. The bidirectional design uses a 1550 nm transmit wavelength paired with 1490 nm receive optics, allowing two-way communication over a single strand of SMF. That reduces fiber consumption while preserving the link budget required for extended runs. For teams standardizing on Arista-compatible hardware, this module provides a practical way to extend service without changing the switching platform. Choose this optic when the cost of a link failure is higher than the cost of the module itself. It is suited to environments where distance, fiber efficiency, and predictable interoperability matter more than commodity pricing. For infrastructure teams, that means fewer constraints at the physical layer and more room to design for resilience.