The 100Gb/s QSFP28 LR4 is a four-channel, pluggable, parallel optical transceiver and designed for 100 Gigabit Ethernet, InfiniBand EDR, FDR, QDR applications. They are compliant with SFF-8665 Specification, IEEE 802.3bm 100GBASE-LR4 and Telcordia GR-468-CORE. The optical transceivers comply with the requirement of RoHS.