Heat Dissipation System Of The Ne40E-X3A; System Air Channel; Fan Speed Adjustment - Huawei NE40E Hardware Description

NE40E
Hardware Description

1.9.2 Heat Dissipation System of the NE40E-X3A

1.9.2.1 System Air Channel

The NE40E-X3A supports one fan module. Each fan module consists of six fans.
The NE40E-X3A draws in air from the left and exhausts air from the rear. The air intake vent
is located at the left side of the chassis and the air exhaust vent is located at the rear of the
chassis.
The fan module of the NE40E-X3A is located at the air exhaust vent. The system draws in air
for heat dissipation, as shown in Figure 1-79.
Figure 1-79 Air flow in the NE40E-X3A chassis
The heat dissipation system consists of the following components:




1.9.2.2 Fan Speed Adjustment

When the system is fully configured, temperatures reported by the temperature sensors on the
Interface boards and MPUs serve as the basis for fan speed adjustment. Table 1-101 lists
general principles.
Table 1-101 Fan Speed Adjustment Principles
Ambient
Temperat
ure
-5° C-+27°
C (23° F -
80.6° F)
27° C-45° C
(80.6° F
Issue 01 (2018-05-03)
One fan module
An air intake vent and an air exhaust vent
An air filter
Rotational
Speed
Low speed (35%
rotational speed)
Linear variation
Noise and Dissipation Standards
When fans rotate at a constantly low speed, the noises
meet the NEBS 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.
1 Hardware Description
177