Mathematical Model of the Reliability Analysis of a Heterogeneous Duplicate Data Transmission System

Abstract

In this work, we consider the mathematical model of the repaired data transmission system as a model of a closed heterogeneous cold standby system with one repair device with an arbitrary number of data sources with an exponential distribution function of uptime and an arbitrary distribution function of the repair time of its elements. We study the reliability of the system, defined as the steady-state probability of failure-free system operation. The proposed analytical methodology made it possible to evaluate the reliability of the entire system in case of failure of its elements. Explicit analytic and asymptotic expressions are obtained for the steady-state probabilities of system and the steady-state probability of failure-free system operation. The problem of analyzing the sensitivity of the reliability characteristics of the system under consideration to the types of repair time distributions was also studied. The obtained formulas showed the presence of a clear dependence of these characteristics on the types of distribution functions of the recovery time of system elements. However, numerical studies and analysis of the constructed graphs showed that this dependence becomes vanishingly small with a “quick” restoration of system elements.

Keywords

• reliability of redundant systems
• steady-state probabilities
• stochastic modeling
• sensitivity
• asymptotic analysis