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3.5
MTBF
The following MTBF (Mean Time Between Failure) values were calculated using a combination of
manufacturer's test data, if the data was available, and a Bellcore calculation for the remaining parts.
The Bellcore calculation used is "Method 1 Case 1". In that particular method the components are
assumed to be operating at a 50 % stress level in a 40° C ambient environment and the system is
assumed to have not been burned in. Manufacturer's data has been used wherever possible. The
manufacturer's data, when used, is specified at 50° C, so in that sense the following results are slightly
conservative. The MTBF values shown below are for a 40° C in an office or telecommunications
environment. Higher temperatures and other environmental stresses (extreme altitude, vibration, salt
water exposure, etc.) lower MTBF values.
System MTBF (hours) :
®
Notes:
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.
Kontron User's Guide ETX®-CN8
174189
16
3 Specifications
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