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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