Fan And Heat Dissipation - Huawei OptiX OSN 8800 Hardware Description

OptiX OSN 8800/6800/3800
Hardware Description

4.2.5 Fan and Heat Dissipation

Each OptiX OSN 8800 T64 subrack has four fan tray assemblies, each of which includes
three independent fans. In each subrack, the lower fan tray assembly has an air filter, but the
upper fan tray assembly does not. The user can withdraw, clean, and replace each air filter.
Version Description
Only one functional version of the fan tray assembly is available, that is, TN51.
Functions and Features
Table 4-15
Table 4-15 Functions
Function
Basic function
Commissioning control
Section-dependent heat
dissipation
Hot swapping
Alarming
Status checking
Working Principle
A fan tray assembly inside a subrack ventilates the subrack to ensure that the subrack works
effectively at an appropriate temperature. The fan tray assembly is located in the lower
portion of a subrack. It draws in air into the subrack, forming an air duct from bottom to top.
Other boards in the subrack are installed vertically. In other words, the boards are parallel to
the air duct. This design ensures reliable heat dissipation.
is performed in the OptiX OSN 8800 T64.
Issue 01 (2016-03-10)
describes the functions of a fan tray assembly.
Description
Dissipates the heat generated by a network element (NE), so
that the NE can operate normally within the designated
temperature range.
Auto Speed Mode: Implements automatic fan speed

regulation, depending on the subrack temperature.
Adjustable Speed Mode: You can manually adjust the fan

speed.
Each subrack is divided into six sections to provide efficient
heat dissipation. The fan speed in each section is independently
regulated.
Provides the hot swapping function for the fan tray assembly.
Reports alarms of the fans, and reports the in-service
information.
Checks and reports on the fan status.
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4 OptiX OSN 8800 Subrack
Figure 4-7 shows how ventilation
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