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A multipoint control unit (MCU) is a video-conferencing device that links two or more audiovisual workstations into one audiovisual conference call.
An MCU may also be referred to as a bridge.
The MCU sits at the local area network’s (LAN) endpoint and gathers relevant system capability data, such as bandwidth, at each video-conferencing workstation. To ensure full participation, the MCU arranges the call to suit the capabilities of the least powerful system.