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. Intel Ethernet - It Just Works!