Cisco 2-Port Asynchronous/Synchronous Serial WAN Interface Card

Cisco 2-Port Asynchronous/Synchronous Serial WAN Interface Card ... 1800, 2800, and 3800 Series Integrated Services Routers. These HWICs help customers enable applications such as WAN access, legacy protocol transport, console server, and dial access server. You can mix and match HWICs to tailor cost-effective solutions for common networking problems such as remote network management, external dial-modem access, low-density WAN aggregation, legacy protocol transport, and high-port-density support.