The quad small form-factor pluggable (QSFP28) is optical module transceivers used for both telecommunication and data communications application.
QSFP28 100GBASE-PSM4, 500m, Single Protocol (103.125G bit/s)
QSFP28 100GBASE-SR4, 100m, Single Protocol (103.125G bit/s)
QSFP28 100GBASE-LR4, 10km, Single Protocol (103.125G bit/s)
QSFP28 100GBASE-CLR4, 2km, Single Protocol (103.125G bit/s)
QSFP28 100GBASE-CWDM4, Single Protocol (103.125G bit/s)