Cisco HWIC-1ADSL 1-port ADSL Card The ADSL HWICs provide 1-port ADSL connectivity to a WAN. These HWICs, combined with the Cisco 1941 Integrated Services Router (ISR), Cisco 1861 ISR, the Cisco 2900 and 3900 series ISRs provide high-speed digital data transmission between customer premises equipment (CPE) and a central office.