The BPX3/2 PCI express backplane is a small form factor PICMG 1.3 backplane that supports a single or dual-processor single board computer, two x16 PCI express mechanical slots driven x8 PCIe links. These two PCIe links are direct interfaces from the SBC. This backplane features two 64-bit/133MHz PCI-X option card slots that are driven with a dual-channel PCIe-to-PCI-X bridge chip. The PCI-X slots can also support universal PCI I/O cards.
The BPX3/2 is designed to fit into a small chassis or embedded in an OEM machine. The small shoebox form factor provides for rack mount computer and storage system designs that support multiple small form factor backplanes and single board computers within a single enclosure.