Startech Cisco SFP-25G-LR-S Compatible SFP28 Module, 25GbE Single Mode Fiber (SMF), 1310nm Tx/Rx, LC Connector, 10km (6.2mi), MSA-Compliant - 25GBASE-LR, 25 Gigabit Optical Transceiver, DDM/DOM Support (SFP-25G-LR-S-C-ST) - SFP28-transceivermodul - 25GbE