The GX7200 Series mainframes are 21-slot PXIe chassis that can accommodate up to 20 instruments as well as a PXI Express controller (an embedded CPU or a PXIe bus expander interface such as the MXI). The backplane architecture supports Gen 2 PCI Express bus signaling and the use of both x1 or x4 system controllers. By offering a combination of PXI-1, Hybrid, and Express slots, the GX7200 offers users the ultimate in flexibility for general purpose as well as high bandwidth test needs.