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3.7
MTBF
The following MTBF (Mean Time Before Failure) values were calculated using a combination of manufacturer's test data, if
the data was available, and the Telcordia (Bellcore) issue 2 calculation for the remaining parts.
The calculation methode used is "Telcordia Method 1 Case 3" in a ground benign, controlled environment (GB,GC). This
particular method takes into account varying temperature and stress data and the system is assumed to have not been
burned in.
Other environmental stresses (extreme altitude, vibration, salt water exposure, etc) lower MTBF values.
System MTBF (hours): 209423 @ 40°C
Fans usually shipped with Kontron Embedded Modules GmbH products have 50,000-hour
typical operating life. The above estimates assume no fan, but a passive heat sinking
arrangement Estimated RTC battery life (as opposed to battery failures) is not accounted
for in the above figures and need to be considered for separately. Battery life depends on
both temperature and operating conditions. When the Kontron unit has external power;
the only battery drain is from leakage paths.
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