The 100Gb/s QSFP28 LR4 is a four-channel, pluggable, parallel optical transceiver and designed for 100 Gigabit Ethernet, OTN OTU4 4I1-9D1F, CPRI 10 applications. They are compliant with IEEE P802.3ba and OTU4 4I1-9D1F standard. The optical transceivers comply with the requirement of RoHS.