Kontron ETX-DC - Manual (Page 15)

ETX-DC®/ Specifications
10
3.8 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): 176102 @ 40°C
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.