100G CWDM4 2km Gen2 QSFP28 Optical Transceiver FTLC1155RGPL QSFP28 transceiver modules are designed for use in 100 Gigabit Ethernet links on up to 2km of single mode fiber. They are compliant with the QSFP28 MSA, CWDM4 MSA, and portions of IEEE P802.3bm. Digital diagnostics functions are available via the I2C interface, as specified by the QSFP28 MSA and Application Notes AN-2153 and AN-2154. The optical transceiver is RoHS compliant as described in Application Note AN-2038.