Video conferencing actually involves a number of technologies that are used in a wide variety of situations, often not just video and sound, but also data that enable collaborative sharing though shared applications. This means that the appropriate bandwidth supporting your network is a critical performance factor.
Video conferencing …
* Meetings are also called point-to-point communications, usually involving full-featured bi-directional audio and video.
* There are a lot of full audio and video streams from the main site where other sites can send sounds. For example, in a presentation situation, students can ask questions.
* It can be called many-many, multi-point communications, providing audio and video over two sites. For most multipoint systems, only one site will appear at conference time, switch between manual or voice-controlled locations (that is, the loudest location on the screen).
Most common video conferencing:
* Desktop Video Conferencing – Typically, a small camera is located at the top of the computer or workstation monitor. Actual video is usually displayed in a small window and often uses shared applications, such as a shared table.
* Studio-based Systems – The studio is specifically equipped for video conferencing. This typically includes one or more cameras, microphones, one or more large monitors, and possibly other devices, such as a top camera for viewing a document. Usually for more formal meetings
In practice, a "studio" can not be a separate room but a standard bedroom with portable devices that can be set up if necessary.
Bandwidth and Compression …
Bandwidth or data rate is the amount of information that is transmitted per second. The higher the bandwidth, the better the signal you want to transmit. In video conferencing, audio and video signals have to be transmitted in real time, meaning that every single moment needs to send a lot of information, which requires very high bandwidth. For example, a "true color" of the image requires 24 bits (3 bytes). The fullscreen image may be 640×480 pixels, more than 7 million bits. For full movie, the image is updated 25 times per second. This exceeds 184 million bits per second. This amount of information is unrealistically possible and your computer may not have it. Therefore, digital video requires some form of compression. The type and extent of the compression used vary by system. It's interesting to note that poor video is less tolerant for most uses than bad sounds, so some systems concentrate on ensuring consistent sound.
To meet the needs of the right bandwidth …
Do not try to figure out what bandwidth you need … or when selecting a service provider for bandwidth. Depending on many factors, you need a fragmented, complete, integrated or connecting T1, DS3 or OC3 network. The cost of solutions provided by service providers varies according to service quality (QoS) and service level agreement (SLA). I highly recommend you an independent telecommunication consultant to help you assess your needs and find the provider that best suits your needs. Unbiased free advice … as well as real-time quotes from multiple providers, indepth research, and negotiation with you on behalf of your service provider. We recommend using FreedomFire Communications.
Source by SBOBET