The Intel Ethernet SFP+ LR (Long Range - Max link distance is 10km) Optic is a SFP+ module designed for the Intel Ethernet Converged Network Adapters (X520 family: product codes: E10G43BTDA, E10G41BFSR, E10G42BFSR, E10G41BFLR). This lead free optic module supports rates selectable 1.25 Gb/s to 10.3 Gb/s bit rates.