Cisco CISCO1841  1841 Integrated Services Router Cisco 1800 Series integrated services routers are the next evolution of the award-winning Cisco 1700 Series modular access routers The Cisco 1841 router offers embedded hardware-based encryption enabled by an optional Cisco IOS Software security image Enhancement of VPN performance with an optional VPN acceleration module Plus sufficient performance and slot density for future network expansion and advanced applications as well as an integrated real-time clock