Steady state behavior of ATM with cold standby of bank computers having internal and external repair policy

摘要

In this paper a stochastic model of an electronic system ATM (Automated Teller Machine) for the measure of reliability and its characteristics by using internal and external repair policies have been considered by the authors. Mechanical failure, environmental failure and failure due to human error have been introduced in this paper. Both types of repair policies of the system are affected by abnormal environment conditions. The reliability characteristics like MTSF (Mean time to system failure), MTCSR (Mean time to complete system recovery) steady state availability and busy period for repairman of system have been obtained using semi- Markov process and mathematical model have been solved by using regenerative point technique. For the improvement of practical utility of the model some particular cases are considered.