Development of the probability model of a typical fragment of the departmental digital telecommunications network of the SESU

Andrey Feshchenko

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-4869-6428

Alexander Zakora

National University of Civil Defence of Ukraine

http://orcid.org/0000-0001-9042-6838

Larisa Borisova

National University of Civil Defence of Ukraine

http://orcid.org/0000-0001-6554-1949

DOI: https://doi.org/10.52363/2524-0226-2021-33-17

Keywords: digital telecommunication network, reliability, probability of trouble-free operation, emergency situation

Abstract

An analysis of the purpose, operating conditions of the components, the hierarchy of the structure of the departmental digital telecommunications network of the State Emergency Service of Ukraine, which is considered as a set of typical network fragments. The structure of a typical fragment of a departmental digital telecommunication network is presented in the form of a structural scheme of reliability without redundancy, which consists of central, regional and district nodes connected in series by communication channels. The required values of the probability of failure-free operation of nodes and channels of the departmental digital telecommunications network depending on the required value of the structural reliability of the typical fragment are substantiated. The application of structural separate double redundancy of nodes with different degrees of hierarchy for typical fragments is proposed in order to simultaneously reduce the requirements for the reliability of nodes of the departmental digital telecommunications network. A probabilistic model of a typical fragment of a departmental digital telecommunication network in the form of block diagrams of reliability for structures with multiple redundancy of central, regional district nodes and communication channels is developed. Analytical expressions for studying the influence of the structure of a typical fragment of a departmental digital telecom-munication network on its reliability by statistical mathematical modeling are obtained. Analytical and graphic materials of statistical mathematical modeling on research of dependence of probability of a serviceable condition of a typical fragment of a departmental telecommunication network on structure of a typical fragment with redundancy and reliability of the corresponding network nodes and communication channels are resulted. It is advisable to choose structures with double node redundancy at least at the central level, at most at all levels, and counting on intermediate values of reliability when reserving nodes of central and regional level in order to increase the probability of good condition of a typical fragment of the departmental digital telecommunications network.

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