The Cisco VWIC-2MFT-T1-DIR  Voice/WAN Interface Cards support data applications on the Cisco MWR 1941-DC Mobile Wireless Edge Router for T1/E1 networks. These cards are dual-port, T1/Fractional T1 , Drop and Insert Multiplexers with integrated T1 CSU/DSUs . The T1 version supports framed and unframed traffic.

The Drop and Insert multiplexer diverts (drops) streams of an aggregate Time Division Multiplexed (TDM) traffic stream, and introduces (inserts) different streams for transmission in the time slots that were previously occupied by the dropped streams. Each VWIC supports a limited channelized capability where the T1 can be flexibly split into two fractional channel groups, one on each port or two on one port. The switching operation can be maintained through router restarts and reloads of Cisco IOS software.

Each card also features protection switch solid state relays on the line interfaces, which together with redundancy logic and relay control added in a Cisco IOS feature set on the MWR 1941-DC router, can be used to provide T1 Protection Switching between redundant routers in applicable implementations.

Each T1/E1 Multiflex VWIC provides two RJ-48C interfaces.

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Here is a link to more info from Cisco's Website: HTTPS://www.cisco.com/en/US/docs/wireless/cards/t1e1vwic/1941cvwic/c1941wic.html