Cisco System`s T1 DSU/CSU WAN interface card is an integrated, fully managed DSU/CSU for T1 or fractional T1 service. It is supported on the Cisco 1600, Cisco 1720, Cisco 2600 and 3600 Series routers, and it provides a cost effective router-DSU/CSU combination with the following features: T1 or fractional T1 network interface. N X 64 kbps or N X 56 kbps non-channelized data rates (N = 1 to 24). Standards based, including ANSI T1.403 and AT&T Publication 62411. Full management features.