The difference between 100GBASE-LR4 QSFP28 1310nm 10km and 100GBASE-LR QSFP28 Single Lambda 1310nm 10km is in hardware. The modulation mode of 100GBASE-LR QSFP28 Single Lambda is PAM4, while the modulation mode of 100GBASE-LR4 QSFP28 is non-return-to-zero code (NRZ) modulation. Products using NRZ modulation are mainly used in 4G Ethernet. The PAM4 pattern is 4 times faster than NRZ modulation in transmission.2020年1月30日にL***eより発表された
