Cisco 1600 1700 2600 2600XM 3600 3631 3700 Series Routers T1 DSU/CSU WIC WAN Interface Module Card WIC-1DSU-T1-V2 800-22193-02 A0. The T1 Data Service Unit/Channel Service Unit (DSU/CSU) WAN Interface Card (WIC) is an integrated, fully managed DSU/CSU for T1 or fractional T1 service.

Cisco Part Number: 800-22193-02 A0
Cisco Model Number: WIC-1DSU-T1-V2
Compatible Models: Cisco 1600 1700 2600 2600XM 3600 3631 3700 Series