How a Video Conferencing Works?

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The purpose of the videoconference is put in contact, through a system of video and audio, two or more geographically separated people. The system works like a TV channel bidirectional and provides a great natural collaboration between those people.

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Videoconferencing has been around since the '70s but is now living your most intense period of growth, thanks to the use of digital technologies and the universal provision of appropriate lines for its implementation by the phone companies.

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A system of high-quality videoconferencing typically uses two types of digital lines:

• ISDN (which may have different trade names depending on the state or the company), which has a speed dial number to any other line, which typically transmit in multiples of 64 Kbits per second. Means in English ISDN Integrated Services Digital Network or Integrated Services Digital Network (ISDN). Currently the supply of such lines in Brazil is increasingly rare.
• IP (Internet Protocol), which uses digital connectivity via TCP / IP normally available in businesses, universities, etc. These lines can be of two types: shared and dedicated. To make a conference call with IP is desirable contract with the service provider a shared or dedicated line that has a number of unique IP and fixed, as is the case of services sold to businesses.

Paral make a reasonable quality videoconferencing should use the so-called broadband. The term "reasonable" here means a video that transmits at least 15 frames per second, not able to show very rapid movements and a monaural audio with TV quality). Using three ISDN lines, the quality is very good, with 30 frames per second. Of course, costs more car

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The modern conferencing equipment work with both types of protocol (IP and ISDN) and some others, such as satellite.

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The advantage of having a digital video conferencing system is that it is possible to send data, and images. Videoconferencing rooms commonly have the following equipment:

• one or two video cameras for general frameworks (there are two types of cameras: fixed and remote cameras, also called PTZ or pan / tilt / zoom)
• omni and unidirectional microphones
• one or two video monitors large, or a video projector (gun)
• a document camera
• DVD player-recorder

Moreover, there is a control console (keyboard or remote control that allows you to connect and disconnect components, guide camera, made the connection, etc..) And computer system (hardware and software) responsible for the management, conversion and transmission of images, and sound data.

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There are many companies such as Polycom, Tandberg, VCON, Sony, Cisco, Huawey, Aethra, and others, offering a wide range of videoconferencing systems, from simple sets that run through ordinary telephone lines (videophones) or local area networks, based in microcomputers (desktop systems), to complex, high quality, which are more expensive systems (auditorium).

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There are also solutions integrators, such as TES, one of the most active and well known, studying the case of the client, select and install the best solution, and provide all technical support and development which would be required.

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Companies and institutions are discovering the huge advantages of video conferencing. Subsidiaries and headquarters are in permanent contact, and allow a great saving of time and money by avoiding unnecessary travel, making meetings between equpes through videoconferencing. Many universities are using video conferencing to support distance learning, with spectacular results. In Brazil for example, several universities offer distance education courses of all kinds, including some with the participation of teachers from other countries.

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In medicine, dentistry, agriculture, etc.., The remote diagnostics is one of the major applications of videoconferencing. In telemedicine, physicians located in remote locations can exchange data of a patient (including radiographs, ultrasound, ECG, etc..) And discuss the best diagnosis and treatment. This is especially useful to support a tertiary medical centers in remote and poor areas, who lack medical specialists, or to hard to reach places such as prisons, oil rigs, disaster zones, etc.. In the U.S. there are over 2000 telemedicine programs in progress, and Brazil are large telemedicine networks, Telehealth as Ruth and Brazil.

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Until recently, videoconferencing was little used in Brazil, mainly due to lack of digital lines and the high cost of equipment and connections. With the privatization of telecommunications companies, the situation changed rapidly, and this fantastic technology began to be used with all its advantages here as well.

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Source: http://technology.ezinemark.com/how-a-video-conferencing-works-7d3794e98146.html

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