The interposer cable connects the PCIe Expansion Node to a supported host compute node.
The interposer cable consists of two circuit cards and a flex cable to provide the physical connection between the compute node and the PCIe Expansion Node. Each compute node and PCIe Expansion Node contain an interposer cable connector on the right rear corner of the system board. When the PCIe Expansion Node is installed, the interposer cable is connected to the interposer cable connectors on the associated compute node and PCIe Expansion Node system boards. The interposer cable extends the PCIe bus, the management interface, and sideband control signaling to the PCIe Expansion Node.
See System board connectors for the location of the interposer connector.