The Finisar FCBN410QB1C25 40GBASE-CR4 transceiver is a Duplex QSFP+ AOC transceiver for optical communications, rated for distances up to 25m and a maximum bandwidth of 40Gbps.
The Finisar FCBN410QB1CX0 40GBASE-CR4 transceiver is a Duplex QSFP+ AOC transceiver for optical communications, rated for distances up to 100m and a maximum bandwidth of 40Gbps.