StarTech.com Dell EMC SFP-1G-BX40-D Compatible SFP Module, 1000BASE-BX-D, 1 Gigabit Ethernet Bi-Directional (BiDi) Fiber Single Strand SFP, LC 40km, Mini GBIC Transceiver SFP, Downstream - Lifetime Warranty (SFP1GBX40DES) - SFP (mini-GBIC) transceiver module (equivalent to: Dell EMC SFP-1G-BX40-D) - 1GbE - 1000Base-BX40-D - LC single-mode - up to 40 km - 1490 (TX) / 1310 (RX) nm