The Cisco 2500 series routers provide a variety of models designed for branch office and remote site environments. These routers are typically fixed configuration with at least two of the following interfaces: Ethernet (AUI), 10BaseT Ethernet hub, Token Ring, Synchronous serial, Asynchronous serial, ISDN BRI.Cisco 2500 routers come with Flash EPROM technology for simplified software maintenance. These systems support a variety of Cisco IOS software feature sets, so you can choose a feature set that supports your specific protocol environment. The software feature sets range from an IP and bridging-only to the full array of Cisco's software functionality, including APPN and RMON. Mission-specific models contain less memory and less hardware functionality to support a subset of protocols. Each mission-specific model can be upgraded to full router capability by downloading a new Cisco IOS software feature set and, if necessary, adding memory. The new Cisco 2516 incorporates an intelligent, workgroup Ethernet hub with sophisticated internetwork connectivity via its four built-in WAN interfaces and the Cisco Internetwork Operating System (Cisco IOS). This product is targeted at small access environments with basic LAN connectivity requirements.