What is MTBF and MTTR?


a) Mean Time between Failure (MTBF) is a reliability term used to provide the amount of failures per million hours for a product.

MTBF = Total working hours/Number of failures of sub system

Total working hours of Equipment = Σ number of Equipment  provided X working hours of Equipment system

b) Mean Time To Repair (MTTR) is the time needed to repair a failed hardware module.

MTBF should be as high as possible and MTTR should be as low as possible.

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