Technical product specification

Technical Reference
47
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, 55 ºC ambient. The MTBF prediction is used to estimate
repair rates and spare parts requirements. The MTBF for the board is 65,955 hours.
2.8 Environmental
Table 15 lists the environmental specifications for the board.
Table 15. Environmental Specifications
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.
Parameter Specification
Temperature
Non-Operating
-40 °C to +60 °C
Operating
0 °C to +50 °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