QSFP28-100G-ER4L 100Gbps QSFP28 ER4 Lite Transceiver, Single Mode, 40km Reach1 Description This product is a 100Gb s transceiver module designed for optical communication applications compliant to Ethernet 100GBASE ER4 Lite standard. The module converts 4 input channels of 25Gb s electrical data to 4 channels of LAN WDM optical signals and then multiplexes them into a single channel for 100Gb s optical transmission. Reversely on the receiver side, the module de multiplexes a 100Gb s optical input into 4 channels of LAN WDM