The Basics of Video Conferencing

Video conferencing hardware and software allows users to see and hear the person they are communicating with, which certainly has bonuses over conference calls and e-mail. Large corporations are using this method more and more frequently to allow their associates maximum convenience and more effective communication.

A video conference allows you to take part in live audio/video presentations in your classroom, and to collaborate through them. Calls can be made between 2 classrooms in the same town, or between 2 classrooms in different parts of the globe. It is also possible for multipoint conferences to take place, where more than 2 schools take part in the same call.

Live video conferences have lots of advantages over other multimedia resources, such as video recordings or television presentations, but the main benefit is that they are interactive, allowing you to talk face to face with someone else in 'real time', but in a different location. This is great for for gaining high levels of engagement from your students.

Multipoint videoconferencing

Simultaneous videoconferencing among three or more remote points is possible by means of a Multipoint Control Unit (MCU). This is a bridge that interconnects calls from several sources (in a similar way to the well-known audio conference call). All parties call the network ID number of the MCU unit or the MCU unit can also call the parties which are going to participate, in sequence. There are MCU bridges for IP and ISDN-based videoconferencing. There are MCU which are pure software, and others which are a combination of hardware and software. A MCU is characterised according to the number of simultaneous calls it can handle.

MCUs can be stand-alone hardware devices, or they can be embedded into dedicated TVC units.

The technology of video conferencing

The core technology using in a videoteleconference (VTC) system is in digital compression of audio and video streams in real time.

There are basically two kinds of VTC systems: