2-14 SPARCengine Ultra AX
i
OEM Technical Manual • May 1999
2.4 Reliability
MTBF values are calculated.
When installed, the minimum MTBF of the CPU fan is 75,000 hours.
2.5 Environmental
Operating Non-Operating
Temperature (board
ambient) 0°Cto+55°C -40°Cto+70°C
Air flow requirement 300 lfm at CPU heatsinks
Humidity 5% to 95% 5% to 95%
RH non-condensing RH non-condensing
Shock 6 G peak, 11ms, 10 pulses 15 G peak, 11ms, 3 pulses
Vibration 0.25G, 2 sweeps, 5Hz ~ 500Hz 1.0 G, 2 sweeps, 5Hz ~ 500Hz
@ 1 Octave / min @ 1 Octave/min
Altitude 10,000 ft. (3,408 M) 40,000 ft. (12,192 M)
ESD --- 15.0KV 100% Soft, 25% Hard
CPU/Memory/Fan
Configuration
Mean Time Between Failure
MTBF (Hours)
Annualized Failure Rate
(AFR)
[1]
1. Assumes 8,760 power-on hours per year.
No CPU
No Memory
267,000 3.28%
CPU Module Installed
32 MB Memory
171,600 5.10%
CPU Module Installed
128 MB Memory
164,300 5.33%
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