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What is Video Conferencing Systems

Encyclopedia of Networked and Virtual Organizations
Video conferencing systems transmit voice, graphics and images, usually of people. This ability to show images of people allows video conferencing to create more of a “social presence” approximating face-to-face interaction. Video conferencing can utilize fully interactive systems that allow for two-way video and audio or one-way video and two-way audio. During video conferences, audio, video, and data signals are transmitted to distance sites using a single combined channel such as a fiber optic line. Two-way audio is most often transmitted over a regular telephone line using audio conferencing technologies. Currently, both analog and digital transmissions are still in use. These transmission signals can be sent via satellite, microwave, fiber optics, coaxial cable or a combination of these technologies.
Published in Chapter:
Synchronous Collaboration and Instruction
Hélder Fanha Martins (Lisbon Polytechnic Institute, Portugal)
Copyright: © 2008 |Pages: 8
DOI: 10.4018/978-1-59904-885-7.ch211
Abstract
Some of the very first Internet technologies to be used for learning or distance education and training were the World Wide Web and e-mail. The World Wide Web allowed multimedia or hypermedia-based instructional content to be loaded on a Web server and browsed using HTML-based browsers, and Internet-based e-mail systems allowed learners and facilitators to correspond asynchronously—anytime, anyplace. However, one of the most significant contributions of Internet-based technologies toward training and collaboration in the last few years has been the introduction of synchronous collaboration technologies. Synchronous collaboration technologies truly create a new medium that brings facilitators and participants together in a dynamic and live environment through which highly interactive communication can occur—closing down the barriers for communication and learning.
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