Fix fault on Mobile Core Network have timing of the causes and importance of the issue. If you can fix the faults quickly. It will disable the risk of other problems that may arise from overlapping. The problem was a double fault and service affect .The quick fix is a factor that may have contributed to the decline in customer satisfaction. Indicators to resolve faults quickly and efficiently is MTTR (Mean Time to Repair). When can reduce the MTTR is the second benefit is maintaining customer satisfaction and increase the performance of the worker. The timing reduction will be to development of the other.