WAN Interface Card

A WIC has a built-in channel service data unit (CSU/DSU) interface to connect to a digital circuit and provide error correction and line monitoring.

For example, WAN interface cards (WICs) support WAN technologies, such as Gigabit Ethernet; and voice interface cards (VICs) support voice technologies.

Voice/WAN interface cards (VWICs) can support voice, data, and voice and data applications, depending on the capabilities of the router in which the VWIC is installed.

The HWIC interface is limited to 400 mega-bits per second bandwidth bidirectional.

[2] With the ISR G2 x900 series Cisco introduced the Enhanced HWIC.