Mtbf; Figure 4: Mtbf De-Rating Values (Reliability Report: Come-Bid7 E2 D-1747Nte Ev) - Kontron COMe-bID7 User Manual

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8.1. MTBF

The MTBF (Mean Time Before Failure) value was 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 "Method 1 Case 3" 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 the MTBF value.
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.
Figure 4 shows the MTBF de-rating value for the module variant when used in an office or telecommunications
environment.

Figure 4: MTBF De-rating Values (Reliability report: COMe-bID7 E2 D-1747NTE EV)

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