QSFP+ stands for Quad Small Form-Factor Pluggable Plus, which includes SR4, PSM4, LR4, IR4, ER4 Lite and ER4, using either 12-fiber MPO or duplex LC receptacle, with features of compliant MSA and IEEE802.3ba, low power consumption, small size and high reliability. Digital diagnostics functions are available via an I2C interface. It offers customers a wide variety of high-density Ethernet connectivity options for data center, high-performance computing networks and service provider applications.