Fan Tray Assemblies; Lower Fan Tray; Air Filter Assembly - Cisco ASR 5000 Series Installation Manual

ASR 5000 Hardware Platform Overview

Fan Tray Assemblies

There are two fan tray assemblies within the chassis. A lower fan tray intakes ambient air and an upper fan tray exhausts
warmed air from the chassis. Each fan tray is connected to both PFUs to ensure power feed redundancy. Both fan tray
assemblies are variable speed units that automatically adjust fan speed based on temperature or failover situations.
Thermal sensors monitor temperatures within the chassis. In the event of a fan failure or other temperature-related
condition, the SMC notifies all operable fans in the system to switch to high speed, and generates an alarm.

Lower Fan Tray

The lower fan tray assembly contains multiple fans and pulls ambient air into the chassis from the lower front and sides
of the chassis. The air is then pushed upward across the cards and midplane to support vertical convection cooling.
Figure 7.

Air Filter Assembly

The chassis supports a replaceable particulate air filter that meets UL 94-HF-1 standards for NEBS-compliant
electronics filtering applications. This filter mounts above the lower fan tray assembly and removes contaminants before
they enter the system. Temperature sensors measure the temperature at various points throughout the chassis. The
system monitors this information, and generates a maintenance alarm, if necessary.
Lower Fan Tray
Fan Tray Assemblies ▀
ASR 5000 Installation Guide ▄
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