08-16-2017, 10:17 PM
Video conferencing
In videoconferencing technology, two or more people at different locations can see and hear each other at the same time, sometimes even sharing computer applications for collaboration. Videoconferencing offers possibilities for schools, colleges, and libraries to use these systems for a variety of purposes, including formal instruction (courses, lessons, and tutoring), connection with guest speakers and experts, multi-school project collaboration, professional activities, and community events.
Placing a video call is a lot like placing a telephone call. After the connection establishment one can see the other person in color video on a TV screen and may be able to transfer files or collaborate via options such as document sharing or white boarding.
Basic Videoconferencing Technology
A videoconferencing system requires the audiovisual equipment, which includes a monitor, camera, microphone, and speaker, and a means of transmission.
Rather than an Internet-based connection, such as that used by web cams, which have to share bandwidth with other Internet data, a compressed video system on a dedicated bandwidth provides smooth audio and video.
The compressed videoconferencing may be transmitted via an ISDN (Integrated Services Digital Network) line or over IP (Internet Protocol) lines. It is an economical solution for high-quality videoconferencing
Connecting
The most significant distinction among videoconferencing systems is the method of transmission. Transmission is important because two systems cannot connect if they are using different transmission methods. Videoconferences can be transmitted over two protocols, H.320 - ISDN (phone) or H.323 - IP (Internet) lines. In the past, most videoconferences used ISDN lines; however, many people are now using IP connections due to cost savings. In order to connect two units using different transmission methods, a bridge must be used that will handle these mixed protocols. In an ISDN call, bandwidth is dedicated to only one videoconference, while in an IP call; bandwidth may be used to transmit for multiple uses. However, ISDN calls can be very costly since user may be making the call over a distance, in which case, long distance phone line charges apply, and ISDN lines take up to 6 phone lines.
Benefits
Educators and librarians from around the country report that videoconferencing technology impacts student learning in a number of ways. Teaching professionals have observed that two-way videoconferences heighten student s motivation, and improve communication and presentation skills. Additionally, a virtual field trip increases the depth of learning and provides a forum for a greater connection with the outside world.
A videoconference can improve student s memory retention by appealing to a variety of different learning styles by including diverse media such as video and audio clips, graphics, animation, and computer applications. Videoconferencing connects previously contained institutions in a way not possible using e-mail, the telephone, or online chat systems. The visual connection and interaction among participants enhance understanding and allow both the content providers and the students to feel connected to one another. That connection leaves a distinct impression on the students who have the opportunity to go on a virtual field trip.