Kontron JRexplus-DC Manual de usuario descargar pdf (Pagina 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

(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

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Kontron JRexplus-DC Manual de usuario Pagina 15