The PRE module is a single-slot module used with the Cisco uBR10012 universal broadband routers. The PRE performs all Layer 2 and Layer 3 packet routing and forwarding by using an advanced parallel processing architecture called Parallel eXpress Forwarding (PXF). This process separates the control plane from the data plane. The PXF architecture support high-performance throughput with IP services enabled on every port. The PRE contains two PCMCIA slots, 32 MB of onboard flash memory, a 512-MB packet buffer, and supports a maximum of 512 MB of SDRAM memory.