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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 ?
AT Conference chose Compunetix after an extensive evaluation of both media processors and Multipoint Control Units.
Having a multipoint control unit that is easily managed and can grow with the greater demand is a cost-effective and necessary solution for a company our size.
New Products Include Powerful Gateways and High Definition Multipoint Control Units
The innovative multipoint features of the 3M VCS3100 MP lets users connect three or more remote locations together for a multipoint videoconference, without requiring a multipoint control unit (MCU).
320-based multipoint control units (MCU), today announced the immediate availability of a new, industrial-strength member of its Multimedia Conference Server product family.
12 /PRNewswire/ -- In a move to make network-based video conferencing readily available for corporate conferencing, health care, banking, law enforcement, and the rapidly emerging desktop conferencing market, BellSouth Telecommunications announced today the selection of the VideoServer Series 2000 Multipoint Control Unit (MCU) for deployment of Multipoint Video Conferencing Service in its nine- state region.
Glowpoint will also host the university's Multipoint Control Unit (MCU) and will manage its multipoint-bridged video conference calls for daily classes.
5 Multipoint Control Unit (MCU) and the SCOPIA Platform's integration with Cisco's Unified Communications platform.
Businesses can manage their own video conferences between several locations by using AT&T's new MultiPoint Control Unit, which implements Px64 standards and is based on proven DEFINITY system technology.
5 Multipoint Control Unit (MCU) will fully support high definition (HD) video as well as high fidelity audio.
The Honors Education Program provides up to a 60 percent discount to Polycom's current and new end-users on purchases of Polycom communication platforms, any classroom package, Multipoint Control Units (MCU), software solutions, and maintenance contracts.
Codian's product line includes Multipoint Control Units, Video Conference Recorders, Streaming Servers and ISDN Video Gateways.

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