Mellanox 100 Gb/s optical transceiver is designed for use in 100 Gigabit Ethernet links on up to 10 km of single mode fiber. It is compliant with the QSFP28 MSA, IEEE 802.3ba 100GBASE-LR4 and IEEE 802.3bm CAUI-4. Digital diagnostic functions are available via the I2 C interface, as specified by the QSFP28 MSA. The module converts 4 input channels of 25 Gb/s electrical data to 4 channels of LAN WDM optical signals and then multiplexes them into a single channel for 100 Gb/s optical transmission. Reversely, on the receiver side the module de-multiplexes a 100 Gb/s optical LAN WDM input into 4 optical signals and then converts them to 4 output channels of electrical data.