40GB QSFP+ transceiver modules are designed for use in 40 Gigabit per second links over multimode fiber. They are compliant with the QSFP+ MSA1,2 and IEEE 802.3ba 40GBASE-SR43 and breakout to 4 10GBASE-SR. Digital diagnostics functions are available via an I2C interface, including Tx and Rx power monitoring. The transceiver is compliant per the RoHS Directive 2011/65/EU4 . See Finisar Application Note AN-20385 for more details.