RadiSys PL35Q, Product Manual, Page: 19 / 72

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MTBF reliability predictions
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MTBF reliability predictions
The predicted MTBF for Q35 motherboards at 35ºC and 55ºC are shown in Table 17 . The
predictions are based on Telcordia SR-332 Issue 1, Method 1, Case 3 with the following
underlying assumptions:
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50% default stress ratio for all modeled components
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Application-specific stress ratios applied for electrolytic capacitors when available
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Ground benign in a controlled environment
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Level II quality grade on all components
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Mechanical components are not modeled
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No burn-in or pre-testing specified
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MTTR specified to be 30 minutes
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No component-specific thermal rises or other voltage/current stress applied
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Relex 7.7 modeling software
Table 17. MTBF reliability predictions
Product code MTBF (hours) @ 35ºC MTBF (hours) @ 55ºC
PLV03-0-0 423,562 222,005
PLVDS03-0-0 382,598 200,534