WAN Interface Card
![Cisco WIC-1SHDSL v2](/Images/godic/202502/20/WIC-1SHDSLv24702.jpg")
A WAN interface card, or "WIC" is a type of specialized network interface card (NIC) made by Cisco that allows a network device such as a router to connect and transmit data over a Wide Area Network. 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.