Specification Sheet

56
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-332-2 Issue 2,
Method I, Case 3, 55⁰C ambient. The MTBF prediction is used to estimate repair rates and spare
parts requirements. The MTBF for the board is 61,444 hours.
2.8 Environmental
Table 29 lists the environmental specifications for the board.
Table 29. Environmental Specifications
Parameter Specification
Temperature
Non-Operating
-40 °C to +60 °C
Operating
0 °C to +50 °C
The operating temperature of the board may be determined by measuring the air
temperature from the junction of the heatsink fins and fan, next to the attachment screw,
in a closed chassis, while the system is in operation.
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
Note: Before attempting to operate this board, the overall temperature of the board must be above the minimum
operating temperature specified. It is recommended that the board temperature be at least room temperature
before attempting to power on the board. The operating and non-operating environment must avoid condensing
humidity.