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Network Technology for Transmission of Visual Information

At present, the information and communication systems and technologies are developing at a very high rate and are becoming widely available. At this, with every year there are more and more programs appear on the market which allows communication between people at a great distance with the use of network technologies and the Internet. Many already known programs provide intercourse for their users with the use of reliable communication for free or almost free of charge; for example: Skype, Viber, NetMeeting, Net Speakerphone, Team Speak, and Discord. All these programs and technologies are called IPtelephony; it includes a variety of technologies that provide the transfer of multimedia data (voice, video and various multimedia) over computer networks and the Internet. They are based on various real-time streaming protocols. Many companies and users around the world use IP-telephony services to support remote communication and video communication between people in real time. In this regard, the work considers the features of the functioning of various protocols that are used to transmit visual information between network users and users of various programs and subnets. Most of them use the same network protocols, but have different ways of dealing with network problems, such as insufficient carrying capacity or network losses, which in one way or another affect the quality of real time communication, and, as a result, the quality of the displayed visual information. In particular, the features of several most widely used multimedia network real time transfer protocols (video data with sound video conferencing) are studied under certain limitations and losses. As well, the results of experiments, the obtained estimates of protocols effectiveness, and the peculiarities in operation of various protocols under the same test conditions are given.