Transcript Video and Text Conferencing

Video and Text Conferencing
By
Isaac Roybal and Pancho Garcia
Video and Text Conferencing
 What is Video and Text conferencing and
how it works
 How does it work-An in-depth look
 Why and Where it is used
 How it affects your network
What is Video and Text
Conferencing ?
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Video conferencing- Communication of video, audio, and
alphanumeric text in a real time environment.
Uses hardware and certain types software to relay the
data over a network.
Microsoft NetMeeting, ICQ, Cu See ME, and Web phoneExamples of standard video and/or text conferencing
software that may be download over the Internet.
Corporations have own conferencing software developed
witch can be very expensive.
How it works
An in-depth look
The three basic ingredients needed- Input,
Output, and Processor
 Where it stands on the OSI model
 It’s requirements and standards
 What types of technology it uses
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Input, Output, and Process
Input- Usually the camera, microphone, and
keyboard
 Out put- Monitor and Speakers
 Process- Software package and
CODEC(coder/decoder). The CODEC is used for
video digitization
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OSI model and Video/Text
conferencing
 Video and Text would fall in levels 3 and 4
on the OSI Model.
 Level 3 would be in use because IP’s are
used to make the connection between the
PC’s, being point-to-point or client/server.
 Level 4 would be in use because a Host-toHost connection is made and also uses TCP.
Requirements and Standards
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Video uses frames/second to deliver the video data to be shown.
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A frame is defined as the number of rows and columns of pixels
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Required bandwidth for basic 30 frame/second video conferencing is
usually about 80.64 Mb/s or two T-3 lines
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H.261 standard-resolves video resolution formats, such as
CIF(352x288) and QCIF(176X144) Needs less bandwidth.
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MUX’s, MCU’s, and CSU/DSU- Multiplexers, Multipoint control units(
Video router) , and CSU/DSU’s used in WAN Video Confrening.
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H.243 standard deals with the interface between the MCU’s and the
CSU/DSU
What technologies are being
used?
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Video Compression-most important part of Video
Conferencing to save bandwidth. Turns the need for two T3 lines to the minimum of a dedicated 56k line.
Video Compression-Interframe coding and Motion
compensation. Interframe coding just changes parts of
the frame that change, cuts down of over head.
Multicast vs. Unicast- This is the way data is transported.
Multicast is the transportation of data all at once to
several different users, where unicast is only the on user
at a time.
Why and Where
is Video Conferencing used?
 Video conferencing
is used to bring
people together
whether it be
business, personal,
or educational
How Does all this affect a
Network?
 Bandwidth, Bandwidth, Bandwidth- Video
and Audio requires a steady and constant
bandwidth.
 This can affect you two ways-One Network
efficacy or Two cost of new leased lines
and equipment.
Conclusion
 Video conferencing can be very strenuous
and high in cost on your network.
 So weight the Pros and Cons very carefully
to see if it is right for your network.
Thank You!