Mtbf - Kontron COMh-caRP User Manual

3.11 MTBF

The MTBF (Mean Time Before Failure) values were calculated using a combination of the
manufacturer's test data (if available) and the Telcordia (Bellcore) issue 2 calculation for the
remaining parts.
The Telcordia calculation used is "" in a ground benign, controlled environment. 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 (such as extreme altitude, vibration, salt-water
exposure) lower MTBF values.
MTBF Value @40°C Part Number
MTBF (hour)
Table 36: MTBF
The MTBF estimated value above assumes no fan, but a passive heat sinking
arrangement. Estimated RTC battery life (as opposed to battery failures) is not accounted
for and needs to be considered separately. Battery life depends on both temperature and
operating conditions. When the module is connected to external power, the only battery
drain is from leakage paths.
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