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Also found in: Acronyms.


(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 ?
This approach can be seen in the continuous presence of Belgium textile machinery companies in the top five Belgium patent applications.
An American College of Obstetricians and Gynecologists Practice Bulletin recommends continuous labor support, noting "the continuous presence of a support person may reduce the likelihood of .
The new office is the first continuous presence in Dubai by a US tourism association and OCVA's third off-shore office.
She said SCW is following up on Bahraini women's continuous presence in the private sector by developing associated services to boost their participation as an effective element in the national economic progress.
The Palestinian continuous presence on the gates of the Mosque is an important way to ensure the maximum protection from the settlers' attacks," he said, noting that many Palestinians stationed at the gates were subjected to severe beatings and verbal and physical abuse.
President Barack Obama's deputy national security adviser, Ben Rhodes, said NATO was aiming to provide "a continuous presence to reassure our allies.
We have had a continuous presence here for more than 60 years and we continue to work with our regional partners day in and day out to enhance security and stability, and build trust and confidence.
The researchers found that the continuous presence of young males shortened the average lifespan of C.
The chamber reconsidered its previous decision excusing Uhuru Muigai Kenyatta from continuous presence at trial, in light of the legal clarifications provided by the Appeals Chamber in its recent judgment on the matter.
Today the UAE is a key market for Siemens, which has maintained a continuous presence in the Middle East region for over 150 years.
It was a remarkable achievement to maintain a continuous presence at the camp for 19 years.
Al Tayer also highlighted the importance of the visit of this senior delegation from Bank of America Merrill Lynch and their continuous presence in Dubai and the UAE which continues to be one of the most attractive emerging markets in the world.

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