The M9021A is designed for the M9018A chassis and utilizes unique features built into the M9018A. It is not compatible with the PXIe system slot in other PXIe chassis. Once installed in the M9018A chassis and connected to an external host computer via a standard PCIe cable, it provides a very high bandwidth serial link between the two.
To ensure the best performance, the M9021A should be paired with a Gen 2 x8 Host PC card such as the Keysight M9048A. A x8 PCIe cable tested to operate at Gen 2 speeds such as the Keysight Y1202A should also be used.