COMe-bEP7 Module User Guide
www.kontron.com
// 49
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 Telcordia calculation used is “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. or 62 years
Figure 6 shows MTBF de-rating for the E1 temperature range in an office or
telecommunications environment. Other environmental stresses (such as extreme
altitude, vibration, salt water exposure) lower MTBF values.
System MTBF (hours) = 983529 h @ 40°C or 62 years
Figure 6: MTBF Temperature De-rating for Product 68010-0000-51-3 COMe-bEP7R
with D-E3351 Processor
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 figure and needs 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.
1478833
1273878.2
1194130.2
1108067
983529.1
766607.6
593345.4
0
200000
400000
600000
800000
1000000
1200000
1400000
1600000
0
10
20
30
40
50
60
MTBF
Содержание COMe-bEP7
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Страница 27: ...COMe bEP7 Module User Guide www kontron com 27 Figure 2 Bottom View of COMe bEP7 5 2x COMe interfaces...
Страница 52: ...COMe bEP7 Module User Guide www kontron com 52 HOT Surface Do NOT touch Allow to cool before servicing...
