The Cisco 1841 Integrated Services Router provides the following support:

• Wire-speed performance for concurrent services at T1/E1 WAN rates
• Enhanced investment protection through increased performance and modularity
• Enhanced investment protection through increased modularity
• Increased density through High-Speed WAN Interface Card Slots (two)
• Support for over 90 existing and new modules
• Support for majority of existing WICs, VWICs, and VICs (data mode only)
• Two Integrated 10/100 Fast Ethernet ports
• Security
  • On-board encryption
  • Support of up to 800 VPN tunnels with the AIM Module
  • Antivirus defense support through Network Admission Control (NAC)
  • Intrusion Prevention as well as stateful Cisco IOS Firewall support and many more essential security features