Huawei OSN 3500 Technical Manual page 31

Protection OptiX OSN 3500 TM - SD
Processing Unit (CPU). The software will re-initialize the chips. The software will
provide a mirror protection on important memories that may affect the services. In the
case the voltage is not stable, which results in memory value changes, the values can
be recovered to normal. In addition, when the voltage is too low, the power system will
automatically cut off the active power to protect the system.
3. Providing board temperature check function
Temperature detection circuit is provided on boards that generate more heat. When
the ambient temperature detected is too high, an alarm is generated to remind the
maintenance personnel to clean the fans.
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