SFP28-25G-LR-S Cisco Compatible, 25GBASE-LR SFP28 1310nm 10km DOM LC SMF Fiber Optical Transceiver Module GLsun SFP28-25G-LR single-mode transceiver is SFP28 module duplex optical data communications support up to 25.78Gb/s. It is with the SFP+ 20 pins connector to allow hot plug capability. Digital diagnostic functions are available via an I2C. It has built-in clock data recovery (CDR). This module is designed for single-mode fiber and operates at a nominal wavelength of 1310nm. https://www.glsunmall.com/product/sfp28-25g-lr-optical-transceiver-module.html