PICMG 3.0 AdvancedTCA defines 10/100/1000Base-T Ethernet over the Base Fabric, called “Base” in this guide. The Base is designed to be the control plane for the shelf. Scaling from 10Mbps to 1000Mbps, the Base interface can accommodate a wide variety of node boards. The Base interface on the Sun Netra CP3240 switch is based around three main components: the Broadcom BCM56503, the Broadcom BCM5464x, and the Freescale MPC8247.