C57 DWDM-SFP25G-31.90 Cisco Compatible, 25G DWDM SFP28 100GHz 1531.90nm 10km DOM LC SMF Fiber Optical Transceiver Module GLsun's DWDM-SFP25G-10-C57-T02 single-mode transceiver is SFP28 module for duplex optical data communications support up to 25.78Gb/s. It is with the SFP+ 20-pin connector to allow hot plug capability. Digital diagnostic functions are available via an I C. It has built-in clock and data recovery (CDR). This module provides 25GBase-DWDM throughput up to 10km over single-mode fiber (SMF) using a wavelength of 1531.90nm via duplex LC connector https://www.glsunmall.com/product/dwdm-sfp25g-31-90-optical-transceiver-module.html