ATOP 400G QSFP-DD FR4 CWDM 2km Transceiver is high-quality 400G FR4 module, designed for 2km optical communication applications, and is compliant to 100G Lambda MSA standard. This module can convert 8-channel 53.125Gb/s electrical data to 4-channel 106.25Gb/s optical signals, and multiplex them into a single channel for 425Gb/s optical transmission. Similarly, it optically de-multiplexes a 425Gb/s input into 4-channel signals, and converts them to 8-channel output electrical data on the receiver side. accessible via a two-wire serial interface.