Cisco offers a variety of connectivity, expansion and upgrade modules and cards to accommodate the customer specific needs. Cisco's components are easily and inexpensively upgradeable as customer requirements change.The Universal Switching Module Enhanced UXM-E can transport ATM cells to and from the cellbus at a maximum rate of 310 Mbps in either direction. The UXM-E can support up to 8000 connections in port mode. A connection on a port can be either a cell-forwarding connection or a complex gateway connection. The UXM-E communicates only ATM cells to either the network or the CPE. On the cellbus, however, the UXM-E communicates either ATM cells or FastPackets. With another UXM-E, it communicates only in ATM cells. With other cards, the UXM-E communicates in FastPackets. Through its gateway functionality, the UXM-E translates between FastPackets and ATM cells so it can transport voice, data, or Frame Relay traffic that other cards have put in FastPackets.