Huawei OptiX OSN 8800 Hardware Description page 64

OptiX OSN 8800/6800/3800
Hardware Description
The fan tray assembly consists of fans and fan control board.
functional blocks of the fan tray assembly.
Figure 4-25 Functional block diagram of the fan tray assembly
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Appearance
Figure 4-26
Issue 01 (2016-03-10)
If any one of the ten fans in the fan tray assembly fails, the system can remain operational for a short

term in environments where temperatures range between 0° C to 40° C (32° F to 104° F). To ensure
long-term operation of the system, replace the fan tray assembly in a timely manner.
Short-term operation means that the continuous operating time does not exceed 96 hours and the
accumulated time per year does not exceed 15 days.
Replace the fan tray assembly immediately if two or more fans fail in the fan tray assemblies.
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FAN: dissipates heat generated by normal operation of the subrack. FAN is the core of
the fan tray assembly.
Fan control board:
Controls the fan speed according to the fan speed regulating signals.
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Detects faults. After a fault is detected, the fan control board reports an alarm. In
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this case, the SCC board issues commands to instruct the other fans to run at the full
speed.
Monitors speed regulating signals, the fan status, and the online/offline state of the
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fan tray assembly.
Receives and carries out commands from the SCC board to shut down the fans on
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the fan tray assembly if necessary.
shows a fan tray assembly.
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4 OptiX OSN 8800 Subrack
Figure 4-25 shows the
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