The OP5707-IO is an I/O expansion unit that provides additional inputs and outputs for existing OPAL-RT simulators and expansion units. It also comes with an AMD Virtex®-7 485T FPGA to give it more processing power. The expansion unit provides up to 256 I/Os, while offering 16 high-speed SFP communication and PCI-Express links for communicating with OPAL-RT simulators, like the OP5707XG2, the OP4605XG2, the OP4610XG2, and other previous models.