Cisco SFP28 Module - For Data Networking, Optical Network - 1 x 25GBASE-BR40 Network - Optical Fiber - 0.1 mil, 0.1 mil, 0.1 mil, 0.1 mil, 0.1 mil Wavelength - Single-mode (Bi-directional) - 25 Gigabit Ethernet - 25GBase-BR4040 km Maximum Distance: