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(1) (MicroController Unit) A computer on a single chip. See microcontroller.

(2) (Multipoint Control Unit) A device that is used to moderate a videoconference of three or more end points, an end point being one or more users in a single location. In "continuous presence" mode, the most common method, the screen is split into one large and several smaller surrounding windows. The MCU sends the video of the dominant speaker to the large window. "Voice switch" mode has only one window, and the MCU switches the dominant speaker to that window. In "chair mode," a human moderator manually controls who is on screen at any given time. An MCU also provides an audio bridge that mixes the audio from all end points.

An MCU may include a built-in H.323 gatekeeper for translating user names into IP addresses, a video PBX for call switching, forwarding and transfer as well as video network management for quality of service (QoS), bandwidth management and accounting. See videoconferencing.

An MCU Plus
This Emblaze-VCON MCU provides a complete solution. Both H.323 and SIP compatible, it includes an H.323 gatekeeper, a video PBX, video network management and full streaming capabilities. It also comes with H.323 client software for desktop PCs. (Image courtesy of Emblaze-VCON, Inc.,
References in periodicals archive ?
It provides XML and SIP APIs and integrates with the Polycom MGC-50 multipoint control unit at HRPDC, to deliver video conferencing, and with the Raytheon ACU1000 for cross-connecting the various radio networks of the jurisdictions.
The HD3000 high-definition videoconferencing system combines streaming, videoconferencing and embedded multipoint control unit (MCU) functionality in one system.
Moreover, for a larger meeting under the Multipoint Control Unit (MCU), the digital location center MoD (Ministry of Defence DigLZ) in Bonn are used temporarily.
Under the terms of the agreement Polycom will supply its iPower videoconferencing systems, an MGC-100 multipoint control unit, Global Management System and PathNavigator call processing server.
multipoint control unit for video-conferences (MCU); : iii.
320-compliant multipoint control unit (MCU) provides up to eight ports of multimedia conferencing and replaced the client's existing system with a reliable, flexible, and comprehensive one.
Codian, headquartered in Slough in the UK, develops enterprise and carrier-class multipoint control units, gateways, video conferencing content servers, and management software.

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