COMe-bV26 - Rev. 1.0, User Guide
// 35
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 MTBF values.
Table 14: MTBF
MTBF
System MTBF (hour) = 669001 h @ 40°C for COMe-bV26 E1 temperature range
Reliability report article number: 38036-0000-30-6
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 6 shows MTBF de-rating values for commercial grade module variant when used in an office or
telecommunications environment. Other environmental stresses (extreme altitude, vibration, salt-water exposure,
etc.) lower MTBF values.
Figure 6: MTBF De-rating Values
