The Fast Ethernet Interface Processor (FEIP) is a fixed-configuration interface processor that provides up to two IEEE 802.3u, 100BASE-T Fast Ethernet (FE) interfaces. Each FE interface on an FEIP can be configured at 100 Mbps, half duplex or full duplex, for a maximum aggregate bandwidth of 200 Mbps. The FEIP uses a Reduced Instructions Set Computing (RISC), MIPS 4600 processor for high performance, and has an internal operating frequency of 100 megahertz (MHz) and a 50-MHz system bus interface. The FEIP has 8 megabytes (MB) of dynamic random access memory (DRAM). It is interoperable with the Catalyst 5000 100BASE-T switch.In Cisco 7000 series routers, proper operation of the FEIP requires that the 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis Interface (RSP7000CI) be installed. Further, it is recommended for your Route Switch Processor (RSP) or RSP7000 to have at least 24 MB of DRAM.