Software reliability analysis of three successive generations of a telecommunications system

Analyzes the data (failure and correction reports) collected on the software of three successive generations of the Brazilian switching system TROPICO-R, during validation and operation. A comparative analysis of the three products is done and the main results are outlined. Emphasis is placed on the evolution of the software and the corresponding failures and corrected faults. The analysis addresses the modifications introduced on system components, the distribution of failures and corrected faults in the components, and the functions fulfilled by the system.