Fast Photonics 40G QSFP+ SR4 Optical transceiver module are designed for 40 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,using MPO connector, compliant with the QSFP+ MSA and IEEE 802.3ba protocol. Digital diagnostics functions are available via the I2C interface, as specified by the QSFP28 MSA