Fast Photonics 50G PAM4 QSFP28 LR Optical transceiver module are designed for 50 Gigabit Ethernet links over 10km single mode fiber. It is operating on 1310nm wavelength, use LC connector, compliant with the QSFP28 MSA and IEEE 802.3cd protocol. Digital diagnostics functions are available via the I2C interface, as specified by the QSFP28 MSA