Mean Time Between Failures

specification (MTBF, or "Mean Time Between Faults") The

average time (usually expressed in hours) that a component

works without failure. It is calculated by dividing the total

number of failures into the total number of operating hours

observed. The term can also mean the length of time a user

may reasonably expect a device or system to work before an

incapacitating fault occurs.

See also Mean Time To Recovery.

(1998-05-01)