Doctor of Physical and Mathematical Sciences Baymankulov A.T.

MA student Urazova Elmira Kalkamanovna

Kostanai State University named after A.Baitursynov

Transmission of various multimedia in communication networks is going to be widespread in recent years. All this is possible thanks to the integration of information networks and their globalization, the development of computer technology and the emergence of the needs from various organizations and institutions, business and commercial structures, individual users in access to new multimedia services. New technologies is widely used now for informational and cognitive, educational, scientific, business, administrative, commercial, security or other human activities.

Communications service providers encounter with a situation where users need not just access to the Internet or even a dedicated high-speed communication channel, but a whole range of services. The complex is to include services such as telephony, data transmission, Internet access, video calls, watching various TV programs, video "on demand", and more in a single package of telecommunication services.

Full-scale implementation of the above, depends on many factors, and primarily is determined by the rate of introduction of new technologies and the convergence of communication networks by means of transforming the network infrastructure in the network and packet switching. The integrated communication services for data transmission are formed by providing users with a number of certain services:

- traditional voice services, data transmission and broadband Internet access;

- video telephony;

- videoconferencing;

- access to broadcast-quality television programs;

- video "on demand";

- music "on demand";

- video surveillance;

- e-learning through video calls from the central educational institutions and other organizations for their branches;

- telehealth for treatment, observation and training of local medical staff;

- various informational and services, and others.

The emergence of broadband connection, transition from analogue to digital television, new advances in video compression and transmission, increase of communicating channel bandwidth allow today to implement video calling (video telephony and videoconferencing) with desired picture quality and sound. Multimedia solutions consistent not only with natural forms of human communication, but also the main trends of communication development. The results of conducted studies showed that the normal telephone conversation interlocutors perceive 10% of the total volume of transmitted information. Possibility to speak and see the interlocutor can increase the information in 5 or even 6 times.

Currently a number of practical schemes of video conference organization are known which depend on the number of participants, the composition of used equipment, tasks, and so on. In the function of communication channels conventional telephone networks, local networks, ISDN, IP-networks, mixed-vendor networks can be used.

Video conferencing system allows carrying out the following tasks:

- conferencing for representational and corporate objectives;

- realization of important remote meetings, discussions and examinations (expertise);

- realization of scientific symposiums, international scientific and technical conferences, demonstrations of the latest equipment and modern technology;

- providing a new level of business cooperation with partners within the same city, within a single country or on the planetary scale;

- providing the opportunity for close people who are in different cities or in other countries of the world to keep in touch.

Existing means of cryptographic information protection can preserve the confidentiality of the content of video conferencing sessions, which is very important in management and business, operations of large companies with an extensive network of branches and in other applications.

To arrange a video communication between two users, different video phones can be used, for example TelePhoSee WVP-2000, which are designed in accordance with the international standards ITU-T H.323, that ensures reliable and high quality work on the Internet. A connection of a user to an IP-network carried out through Ethernet port. Analog telephone port (POTS) TelePhoSee embedded into videophone allows you to connect to a telephone line or PBX and use it as ordinary phone.

The main technical and functional capabilities of various IP-videophones are:

- completely independent system of videoconferencing organization on IP-networks (Ethernet port);

- frame rate up to 25 ... 30 frames per second, PAL or NTSC;

- network Interface: 10 Base T (RJ45) Ethernet with connectable to different routers, including ADSL;

- resolution: Format QCIF 176.144, CIF 352.288 and 4CIF 704.576 pixels for still images (H.261 Appendix D);

- full compliance with the international standards ITU-T H.323 (videoconferencing on IP networks), supported video standards: H.261, H.263, Audio: G.711, G.722, G.723.1, G.728;

- integration of multimedia applications: (data channel Proprietary or T.120) shared "whiteboard", transmission of data files, saving and sending audio and video messages;

- echo suppression and etc.

Exploitation of videophones with different technical characteristics showed that it is possible to achieve an acceptable image quality (up to 15 ... 25 frames / s, CIF) and sound (G.729) using full-duplex bands of 384 kbit / s (set in configuration).

Dial-up is carried out within 3 ... 5 seconds. In cases of sudden movements of transmitted objects image degradation isn’t observed. Color transfer and sound quality is good.

The quality of video transmission is also important in video surveillance systems. Video surveillance systems provide in the operator or automatic mode solution of many problems of detection, control, measurement and selection of the particular objects. According to information formed by video surveillance systems, unauthorized access to facilities, monitoring the change in their state can be analyzed and detected, also other special information problems could be resolved

Anything can be an object of surveillance and control, for example an office, bank, warehouse, parking place or gas station, house, apartments and so on.

The main trend in the development of technology and telecommunications is network construction on the basis of digital switching methods and data transmission. Now for the digital communication channel it does not matter what is contained within the transmitted signal - video, audio, or any other data. Digital transmission system allows providing high noise immunity of transmitted information and stability of signal transmission parameters. There is a tendency of increasing share of packet switching networks, not only for telephone traffic transmission, but also for expansion of possible range of new video information services and in providing integrated communication services on IP-based networks.

Although the tactics of provision of new IP-based services at this stage will be oriented only on high-yield member, however, the main objective is to bring them to small and mid-sized business, and even to the bulk user.

Providing video information services by communication service providers, together with the existing communication services will provide a logical extension of their spectrum and will determine a new stage in the activities of leading telecommunication companies in the coming years.