Backplane with five PCIe x4 Gen2 slots. The OSS target backplane supports a PCIe Gen2 target cable adapter installed in the OSS target slot and one or more PCIe x16 expansion cards installed in the expansion slots. Slots operate at PCIe x4 Gen2 speeds and are backward compatible, supporting Gen1 and Gen2 target adapters and expansion cards. Only OSS target adapters are supported. Expansion cards designed to the PCIe PCI-SIG specification are supported. While the backplane is used in the CUBE products, it can also be used in test applications as a stand-alone backplane with 12VDC power applied.