Fast Photonics 100G QSFP28 SR4 Optical transceiver module are designed for 100 Gigabit Ethernet links over multimode fiber.It is a cost-effective, low power optical transceiver with high port densities and compact size. It is operating on 850nm wavelength, compliant with the QSFP28 MSA and IEEE 802.3bm protocol. Digital diagnostics functions are available via the I2C interface, as specified by the QSFP28 MSA.