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The Cisco IP/VC 3510 Multipoint Control Unit (MCU) is a desktop or rack-mountable unit that enables conferences between three or more endpoints. Each Cisco IP/VC 3510 MCU can support up to 15 simultaneous participants in one or multiple conferences at bandwidths from 128 kbps to 1.5 Mbps, giving it a wide range of performance. Its compact design also provides a way to cascade multiple MCUs together to support larger conferences. For small videoconferencing networks, the MCU features built-in gatekeeper functions.