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The T1 Data Service Unit/Channel Service Unit (CSU/DSU) WAN interface card provides full or fractional T1 service. The T1 CSU/DSU WIC does not provide channelized T1 or ISDN PRI.The Cisco T1 DSU/CSU -V2 WIC is supported on the Cisco 1700 Series, 2600XM Series, 3631, and 3700 Series routers, and Cisco ICS 7750 software.Cisco 1701, 1710, 1711, and 1712 are fixed-configuration routers and do not support the WIC-1DSU-T1 or WIC-1DSU-T1-V2. Also, the Cisco 1750 does not support this WIC.