The Cisco WIIC-1DSU-t1= WAN Interface Card, Version 2, is a T1 DSU/CSU WAN data interface card. As a DSU/CSU module, it provides the necessary interface to connect T1 lines for WAN data transmission, handling framing and line termination for reliable data transfer. This Cisco WAN data interface card is identified by the part number WIIC-1DSU-t1= and enables T1 connectivity in Cisco network deployments.
