Huawei CloudEngine 7800 Series Hardware Description page 63

CloudEngine 7800&6800&5800 Series Switches
Hardware Description
Airflow
The cooling systems of the CE7800&6800&5800 series switches have front-to-back or back-
to-front airflow depending on the airflow direction of the power modules and fan modules used.
The airflow direction of the power modules and fan modules required on the
CE7800&6800&5800 series switches depends on how the switches are installed in cabinets.
Typically, cabinets in a data center have cold air flowing in from the front and hot air exhausted
from the back. If CE7800&6800&5800 series switches are installed with the power supply side
facing the front, you are advised to use fan modules and power modules with front-to-back
airflow in the switches.
Issue 16 (2015-08-26)
All fan modules are hot swappable.
NOTE
l Front-to-back airflow: The power modules and fan modules using front-to-back airflow are marked
or
the port side, as shown in
l Back-to-front airflow: The power modules and fan modules using back-to-front airflow are marked
or
supply side, as shown in
l When the power module and fan module use forcible heat dissipation, they must use the same airflow
method. For example, if the power module with back-to-front airflow is used, the fan module with
back-to-front airflow must be used.
l When the fanless 150 W AC power module is used, the fan module with either of the airflow methods
can be used.
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. Air flows into the chassis from the power supply side and flows out from
Figure 2-21 (CE5800 as an example).
. Air flows into the chassis from the port side and flows out from the power
Figure 2-22 (CE5800 as an example).
2 Chassis
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