Intel Desktop Board DH77EB Technical Product Specification
64
2.7
Reliability
The Mean Time Between Failures (MTBF) prediction is calculated using component and
subassembly random failure rates. The calculation is based on the Telcordia SR-332,
Issue 2; Method I Case 3 50% electrical stress, 55 ºC ambient. The MTBF prediction is
used to estimate repair rates and spare parts requirements. The MTBF data is
calculated from predicted data at 55 ºC. The MTBF for the Intel Desktop Board
DH77EB is 328,467 hours.
2.8
Environmental
Table 39 lists the environmental specifications for the board.
Table 39. Environmental Specifications
Parameter
Specification
Temperature
Non-Operating
-20
°
C to +70
°
C
Operating
0
°
C to +55
°
C
Shock
Unpackaged
50 g trapezoidal waveform
Velocity change of 170 inches/s²
Packaged
Half sine 2 millisecond
Product Weight (pounds)
Free Fall (inches)
Velocity Change (inches/s²)
<20
36
167
21-40
30
152
41-80
24
136
81-100
18
118
Vibration
Unpackaged
5 Hz to 20 Hz: 0.01 g² Hz sloping up to 0.02 g² Hz
20 Hz to 500 Hz: 0.02 g² Hz (flat)
Packaged
5 Hz to 40 Hz: 0.015 g² Hz (flat)
40 Hz to 500 Hz: 0.015 g² Hz sloping down to 0.00015 g² Hz
