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www.bzupages.com

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What is Video Conferencing?

• Allow two or more locations to interact via two-way video and audio transmissions simultaneously.

• People in different geographic locations can have a meeting, can see and hear one another using computers & Communications.

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Types.

• Point to Point VConferencing:-– A live video and audio communication link between

any two locations.– Each participant has a Computer

with Speakers & Monitor, Video

Camera, Microphone & High speed

Network Connection. While they

talk to each other, their voices

are delivered over the speaker

& their images appear on other

computer.

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Type.

• Multipoint VConferencing:-– Allows 3 or more participants in different locations.

– To handle this situation,

the H.323 standard intro-

duces the concept of a

Multipoint Control Unit

(MCU). The MCU can be

thought of as a "video

bridge". The MCU

connects to the Internet

and registers with the

gatekeeper.

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• Gatekeeper:-» When users want to join a particular

videoconferencing session, they dial the service number/password combination. The gatekeeper checks to see if that service has been registered by a MCU. The gatekeeper completes the call by connecting the client to the specified videoconference on the MCU.

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Equipment

• Each communication party must have – a computer with suitable operating system loaded and

network capable, – a few cameras– microphones (at least 1 or more, depending on the

way you use), – and a video conferencing software– Since the equipment above can be very cheap in

price, the cost of the whole system is quite reasonable.

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• At one site you have a video camera which generates a video signal

• The video is made up of a large number of individual picture frames

• a frame is one of the many still images which compose the complete moving picture.

How Does it Work.

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How Does it Work.

• Picture, sound and extra data must be compressed to minimize network costs and maximize the reception quality.

• This compression is typically done by the video Codec (Coder/Decoder).

• From one site's Codec, the video may be passed along a wide range of communication networks.

• At the end of the link the video is decompressed to generate the image and audio that was originally captured by the video camera.

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Main Advantages.

• A - Can communicate to anywhere in the world. No need for excessive travel

expense/costs.• B - low cost than flying abroad.• C - very interactive in comparison to

email/chat. More personal.• D - You can see who you are talking to.

Easy to build a relationship.• F - can see the other party, more personal

than fax - telephone, email.

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Main Disadvantages.

• A - “Personal feel” is lost.

• B - Hard on a group basis due to one-way audio system.

• C - Not always clear to understand.

• D - Picture soften unclear (fuzzy). Communication sometimes failed.

• E - timelag - connection/link problems - sound - volume and cut-off

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