ETU-LINK 25G CWDM SFP28 optical module is a type of SFP28 optical module that adopts Coarse Wavelength Division Multiplexing (CWDM) technology. Its wavelength range is from 1270nm to 1610nm, and it is used for 25G Ethernet and CPRI high-speed data transmission. They are compliant with SFF-8431, SFF-8432. The transmitter converts serial CML electrical data into serial optical data. The receiver converts serial optical data into serial CML electrical data. Digital diagnostics functions are available via a 2-wire serial interface, as specified in SFF-8472.