RELIABILITY EVALUATION OF THE TRIPLED WIRED CHANNEL WITH DOUBLED PROTECTIVE REINFORCEMENT

https://doi.org/10.23939/cds2024.02.010
Received: May 29, 2024
Revised: June 03, 2024
Accepted: July 10, 2024
1
Lviv Polytechnic National University
2
Lviv Polytechnic National University
3
Computer-Aided Design System Department, Lviv Polytechnic National University

Modern computer systems rely heavily on the exchange of information through various physical communication channels. The failure of a communication channel, particularly in systems responsible for critical facilities, can result in significant material and human losses. Therefore, ensuring the reliability of communication channels is a pressing issue. This paper is part of a series of publications dedicated to evaluating the reliability of communication channels. The purpose is to develop methods and models for assessing the reliability of a communication channel with tripled wired redundancy and doubled protective reinforcement. Block diagrams and dynamic fault trees were used to create mathematical models during the formalization stage. These models were used to develop both static and dynamic models based on state and transition diagrams. The static models are expressed using logical-probabilistic expressions, while the dynamic models are represented as systems of differential equations using Markov analysis. The channel’s structure can form six different schemes due to the presence of three cores and a double protective reinforcement. Three of these schemes are symmetrical, and the other three are asymmetrical. The most reliable structure is the one with separate outer and inner protective reinforcements for each of the three cores. The least reliable structure is when the three cores share common outer and inner reinforcements. Reliability indicators for structures with various combinations of cable reinforcements take intermediate values between the extreme cases. The reliability of such structures increases with an increase in the number of separate reinforcements. It is important to note that reliability indicators obtained using static models are underestimated and less accurate compared to indicators calculated using dynamic models. However, it is recommended to use static models for the initial assessment of the reliability indicators of communication channels due to their simpler construction. Models have been developed to improve the reliability assessment of communication channels with multiple redundancies of cores and an arbitrary number of protective reinforcements. Specifically, models have been created for a communication channel with triple redundancy of cores and double protective reinforcement. The proposed approach will be useful for assessing reliability in the design of modern technical systems, particularly computer systems responsible for critical facility operations. Failure of these systems can result in material damage and endanger service personnel. Further research will involve establishing regularities in the obtained models. These regularities will form the basis of specialised software for automated reliability assessment of communication channels with any number of cores and protective reinforcements.

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