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The subject matter of the article is the processes of structural synthesis and parametric analysis of information and telecommunication networks (ITN). The aim is to develop the methodological apparatus which will enable obtaining ITN structural and technical parameters in order to ensure the operation of safety-critical systems (SCS), adaptive to external conditions and resistant to risks. The tasks to be solved are: to formulate principles and definition of the structure of the risk-adaptive management methodology of ITN SCS parameters; to determine the composition of the methodical apparatus and the applied means of the suggested methodology. General scientific methods used are: system analysis, structural and parametric synthesis, methods of decomposition and aggregation, methods of risk-adaptive management. The following results are obtained. The diagram of the main stages of ITN analysis is presented. In this case, the elements of the distributed architecture of ITN SCS are defined. The requirements for calculating the characteristics of the information and technical structures of the network are listed. The ways of fixing SCS applications at the functional nodes of the network are considered. The steps that are performed at the stage of solving the task of network setting are defined. The stage of matching task settings and operational management is a part of adaptive control. The above steps of analysis, synthesis and management of ITN are the basis of the structure of the risk-adaptive ITN SCS management methodology, which includes the following elements: principles, models, methods, and applied means. The methodology is based on the principles of decomposition, matching of goals and coordination of management, stream analysis and modeling of processes, adaptive and risk-based management. The composition and peculiarities of models (mathematical and systemic) and methods which are the basis of the methodical apparatus are determined. The applied part of the methodology is implemented by the information technology of adaptive management of distribution of network traffic. On ITN basis, the problem of interaction of technical and software means in the management of traffic distribution and organization of collecting, processing and transmitting information in the management system is solved. Adaptive management is provided by solving the tasks of setting the mode. Risk orientation is represented by two contours of feedback, which involves assessment and risk management at the stages of structural and parametric synthesis and distribution of network traffic. Conclusions. The implementation of the suggested methodology for ITN synthesis and management will enable the operation of SCS that is adaptive to external conditions and risk-resistant, which contributes to the improvement of the system safety.

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PRINCIPLES AND STRUCTURE OF THE METHODOLOGY OF RISK-ADAPTIVE MANAGEMENT OF PARAMETERS OF INFORMATION AND TELECOMMUNICATION NETWORKS OF CRITICAL APPLICATION SYSTEMS