Huawei OptiX OSN 8800 Hardware Description page 25

OptiX OSN 8800/6800/3800
Hardware Description
Figure 4-7 Subrack heat dissipation and ventilation system
Front
Air inlet
The OptiX OSN 8800 supports two fan speed modes, as described in
section-dependent speed regulating function is available in Auto Speed Mode. The Auto
Speed Mode is recommended.
Table 4-16 FAN speed mode
FAN Speed
Mode
Auto Speed Mode Fan speed in each section is regulated automatically according to the
Issue 01 (2016-03-10)
Air outlet
Fan
Fan
Air filter
Description
temperature of the boards in the section that the fans are targeted for.
Lower than 25° C (77° F): the fans run at low speed.

Higher than 45° C (113° F): the fans run at high speed.

25° C to 45° C (77° F to 113° F): The fans automatically adjust their

rotation speeds. This mode can reduce noise and is power-saving.
Fan speed in each section is independently regulated.
The fans run at full speed if the speed regulating signal is abnormal.
If one of the fans in one section fails, the other fans in this section run
at full speed.
When the user queries the fan speed using the NMS, the highest fan
speed among all sections is displayed. In other words, if the fans in
one section rotate at high speed, the NMS displays the fan speed as
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Side view
Fan
Fan
Air filter
4 OptiX OSN 8800 Subrack
Back
Air outlet
Air inlet
Table 4-16. The
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