The WIC (WAN Interface Card) may contain an integrated CSU/DSU that can be inserted into a router slot.
A WAN interface card is a specialised network interface card (NIC) that allows a network device such as a router to connect and transmit data over a Wide Area Network.
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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.
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