About Videoconferencing
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What is Videoconferencing?
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At its simplest, videoconferencing is like using a telephone except that you are able to see your remote site caller. Of course the technology has the ability for both ends to see and hear each other during a video meeting. At its most sophisticated, videoconferencing provides transmission of full-motion video images and high-quality audio between multiple locations.
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Videoconference Bridging
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Several locations can be bridged together to have your meeting at many locations. Bridging a call requires either special hardware called a multi-point control unit, or many CODECs can bridge a call between it and three other CODECS.
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Videoconference Networks
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Video Conferencing is a form of communications involving the transfer of information between two or more locations. The connection between these locations is the communications channel and is called the network. Bandwidth is the resource of a network. It is the term given to the rate of transfer of information, usually in bits/second.
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Videoconference Standards
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There is an ever increasing number of standards, terminologies and buzz-words used within the video conferencing industry that can make understanding what is both available and compatible a minefield. We have the H.300's, the G.700's, the T.120's and the H.450's, not to mention ISDN, LAN, WAN, ADSL, VPN and POTS all mixed with NTSC, PAL and CIF. To complicate matters more, we also have to deal with the forthcoming media-enabled 3G mobile phone and how this links in with existing systems.
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Videoconference Equipment
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The core technology used in a video-teleconference (VTC) system is digital compression of audio and video streams in real time. The hardware or software that performs compression is called a codec (coder/decoder). Compression rates of up to 1:500 can be achieved. The resulting digital stream of 1s and 0s is subdivided into labeled packets, which are then transmitted through a digital network of some kind (usually ISDN or IP).
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The Video Room
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Videoconferencing should provide a complete simulation of a normal meeting environment, enabling both parties to see, hear and present material, just as if they were in the same room. A videoconference facility is made up of the room, the video pickup and display component, the audio pickup and delivery system, and the codec (code/decode) that is used to convert the signals into a compressed digital form to be transmitted.
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