ATOP SFP+ CWDM for Ethernet 40KM transceiver is designed for use in 10Gigbit, multi-rate links up to 40KM of G.652 single mode fiber. Compatible with SFF-8431, SFF-8432 and supporting 10G ER Ethernet and 10G Fiber Channel protocol, this product is well suited for Fast Ethernet and data centre interconnect applications. Digital diagnostics functions are available via an I2C interface, as specified by SFF-8472.