Keep critical uplinks alive across distance with a 1 GbE BiDi SFP designed for single-mode fiber. The AddOn Networks SFP-1G-BX-U-40-N5-AO supports LC connectivity and reaches up to 40 km, giving infrastructure teams a compact way to extend Ethernet without moving to a larger optics platform. This module is a strong fit when you need long-haul transport between buildings, remote closets, or aggregation points and want to preserve a simple SFP footprint. BiDi operation reduces fiber strand requirements compared with traditional duplex optics, which can matter in constrained plant environments or when existing fiber is already allocated. For teams standardizing on proven 1 GbE infrastructure, this transceiver offers a clean path to extend service without changing the switching layer. It is built for single-mode deployments where distance, link stability, and compatibility are the priorities. Use it to keep remote systems connected, reduce re-cabling effort, and maintain predictable performance across extended runs.