QSFP28 stands for Quad 25 Gigabits Small Form-factor Pluggable. FangHang's 100G QSFP28 includes SR4, CWDM4, PSM4, LR4 and ER4 Lite series. The series of products adopt LC or MPO optical ports and are compatible with IEEE802.3ba, QSFP28 MSA and other standards. It is mainly applied in Data center, OTN and other environments.