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 ? • 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 phone- Examples 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
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
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-to-Host connection is made and also uses TCP.
Requirements and Standards • Video uses frames/second to deliver the video data to be shown. • A frame is defined as the number of rows and columns of pixels • Required bandwidth for basic 30 frame/second video conferencing is usually about 80.64 Mb/s or two T-3 lines • H.261 standard-resolves video resolution formats, such as CIF(352x288) and QCIF(176X144) Needs less bandwidth. • MUX’s, MCU’s, and CSU/DSU- Multiplexers, Multipoint control units( Video router) , and CSU/DSU’s used in WAN Video Confrening. • H.243 standard deals with the interface between the MCU’s and the CSU/DSU
What technologies are being used? • Video Compression-most important part of Video Conferencing to save bandwidth. Turns the need for two T-3 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.