The Cisco 1841 Integrated Services Router provides the following support: 1f=Wire-speed performance for concurrent services at T1/E1 WAN rates 2f=Enhanced investment protection through increased performance and modularity 3f=Enhanced investment protection through increased modularity 4f=Increased density through High-Speed WAN Interface Card Slots (two) 5f=Support for over 90 existing and new modules 6f=Support for majority of existing WICs, VWICs, and VICs (data mode only) 7f=Two Integrated 10/100 Fast Ethernet ports CISCO router 1721 Features: 1) 10/100base T modular router 2) With 2 WAN slots 3) With 32/64MB 4) Multi-WAN enter styles, including high-speed enterprise-grade digital user lines (DSL) 5) high-capability router and broad band management 6) Router between dummy LAN (VLAN) (only item 1721 can provide) 7) With VPN entry of firewall option Other models: 1) CISCO2611XM 2) CISCO2621XM Remarks: Other routers are available. If you need other models, please feel free to contact us.