Fan Speed Adjustment; Fan Module - Huawei NE40E Hardware Description

NE40E
Hardware Description
Figure 1-81 Air flow in the NE40E-X8

1.9.3.2 Fan Speed Adjustment

When the system is fully configured, temperatures reported by the temperature sensors on the
Interface boards, SFUs, and MPUs serve as the basis for fan speed adjustment. Table 1-106
lists general principles.
Table 1-106 Fan Speed Adjustment Principles
Ambient
Temperat
ure
-5° C -
+27° C
(23° F -
80.6° F)
27° C -
40° C
(80.6° F -
104° F)
Over 40° C
(104° F)

1.9.3.3 Fan Module

The fan modules, each containing one fan, are located side by side at the air exhaust vent. If a
single fan fails, the system can still work normally at an ambient temperature of 40° C (104° F)
for a short period of time.
Issue 01 (2018-05-03)
Rotational Speed
Low speed (50%)
Linear variation
High speed (100%)
Noise and Dissipation Standards
When fans rotate at a constantly low speed, the
noises meet the standard and the fans meet heat
dissipation requirements of a fully configured
system.
The fan speed is adjusted smoothly in linear mode,
without a sharp increase in noises.
Fans rotate at high speed to meet heat dissipation
requirements.
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