The FM-S28 provides two QSFP/QSFP+ module interfaces directly connected to the carrier card using the differential pairs of the FMC HPC connector. This enables a wide range of full data rate 40 Gigabit Ethernet, Fiber Channel, Infiniband and other very high performance serial standards to communicate with FPGA devices that have built in 10 Gigabit serial transceivers, such as the Xilinx Virtex-6 HXT family. When used with carrier cards with FPGAs that support the standard 3.125 Gigabit/sec. signaling rates, 10 Gigabit Ethernet and similar standards are supported using LX4 style methods. Most functions of the FM-S28 support a range of Vadj from 1.8 to 2.5 V. This enables the serial transceivers, clock generators, EEPROM and LEDs to work with various Spartan-6, Virtex-5 and Virtex-6 based carrier cards.