The Cisco ADSL2 & ADSL2+ high-speed WAN interface cards (HWICs) deliver business-class asymmetric DSL (ADSL) services for customers ranging from small-to-medium sized businesses to enterprise branch offices. The ADSL HWICs provide 1-port ADSL connectivity to a WAN. These HWICs, combined with the Cisco 1841 integrated services router (ISR), Cisco 1861 integrated services router, the Cisco 2800 & 3800 series integrated services routers (ISRs), provide high-speed digital data transmission between customer premises equipment (CPE) & a central office. This enables service providers & resellers to offer additional services by supporting features for business-class security, voice integration, differentiated classes of service (Co S), & managed network access with Cisco IOS software. These value-added features, along with the manageability & reliability of Cisco IOS software technology, provide the mission-critical networking that businesses require.