Huawei OptiX OSN 8800 Hardware Description page 40

OptiX OSN 8800/6800/3800
Hardware Description
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 4-23 FAN speed mode
FAN Speed
Mode
Auto Speed Mode Fan speed in each section is regulated automatically according to the
Adjustable Speed
Mode
Each OptiX OSN 8800 T32 subrack is divided into three partitions in terms of heat dissipation.
The subrack adopts two fan tray assemblies to implement partitioned heat dissipation. See
Figure
Issue 01 (2016-03-10)
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
high speed in the query result.
Six fan speeds are supported: Stop, Low Speed, Medium-Low
Speed, Medium Speed, Medium-High Speed, and High Speed. In
this mode, the user manually sets the fan speed and fans in all sections
run at the same speed. The user cannot independently set the fan speed
for a specific section.
4-14.
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4 OptiX OSN 8800 Subrack
Table 4-23. The
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