25GBASE-LR LO-SFP28-LR -SFP28 25GBase-LR SM 1310nm 10km LC DUAL RATE 10/25GbE  optical module ,  working with single-mode optical fiber (duplex transmission over 2 fibers), operates at a wavelength of 1310 nm, transmitting data at a speed up to 25 Gbps Ethernet over a distance of 10 km. LC/UPC duplex optical connector. The MSA-compliant transceiver works with devices such as switches, converters, routers, and servers.