Cisco 876 routers is a fixed-configuration routers that supports ADSL over ISDN connections in small offices. They provide the performance needed to run concurrent services, including firewall, intrusion prevention, and encryption for VPNs; optional 802.11b/g for WLAN networking; and quality of service (QoS) features for optimizing voice and video applications. In addition, the Cisco Router and Security Device Manager (SDM) Web-based configuration tool simplifies setup and deployment and centralized management capabilities give network managers visibility and control of the network configurations at the remote site.