Kontron JRexplus-DC - Manual (Page 15)

KTD-S0008-F Page 10 Specifications
JRexplus-DC User's Guide
3.6 Environmental Specifications
Temperature
Operating:
Ambient temperature: 0 to +40°C (passive cooler with no airflow)
Ambient temperature: 0 to +60°C 1) (active cooler with appropriate airflow)
Non operating:
Ambient temperature: -10 to +85°C
Note: 1) It is the customer's responsibility to provide sufficient airflow around each of the components to keep them within the
allowed temperature range.
Humidity
Operating: 10% to 90% (non condensing)
Non operating: 5% to 95% (non condensing)
3.7 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. Figure 1 below shows MTBF de-rating for the E1
temperature range in an office or telecommunications environment. Other environmental stresses
(extreme altitude, vibration, salt water exposure etc.) lower MTBF values.
» System MTBF(hours) = 227228 @ 40°C