StarTech.com Cisco SFP-10G-BX-D-40 Compatible SFP+ Module, 10GBASE-BX, 10 Gigabit Ethernet Bi-Directional BiDi Fiber Single Strand SFP+, LC 40km, Cisco ASR9000ASR1000, NCS5500, Downstream - Lifetime Warranty (SFP-10G-BX-D-40-ST) - SFP+ transceiver module (equivalent to: Cisco SFP-10G-BX-D-40) - 10GbE - 10GBase-BX-D - LC single-mode - up to 40 km - 1270 nm / 1330 nm