These flexible interface cards support multiple integrated data, voice and video applications, facilitating the migration from data only as well as circuit-switched voice/video services to a packet voice/video solution.Data Solutions: 1- , 2- and 4-Port T1/E1 WIC with Integrated DSU/CSUThe Cisco MFT VWIC3 interface cards simplify branch-office connectivity by integrating the functions of a router, T1/E1, and fractional T1/E1 serial interface with a fully managed DSU/CSU.