Keep long-reach access links stable without moving to a more expensive optics tier. This 1000BASE-BXD SFP module supports 1 GbE transmission over single-mode fiber up to 10 km, using a bidirectional 1550 nm / 1310 nm wavelength pair to carry traffic efficiently on paired equipment. It is a practical fit for campus interconnects, building-to-building runs, and access aggregation where predictable optical performance matters more than excess capability. Designed for environments that standardize on Arista-compatible transceivers, this module helps maintain consistent procurement and deployment patterns across the network. The SFP form factor fits common switch and router ports, making it easy to slot into existing infrastructure without redesigning the optics layer. For teams balancing cost, reach, and operational simplicity, this module delivers the right level of capability for 1 GbE single-mode deployments that need dependable distance without overbuying.