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

Fan Tray Assemblies

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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: Lower Fan Tray

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
ASR 5000 Installation Guide
12
Description
VDC (-48 VDC input terminals)
RTN (voltage return terminals)
PFU handle
Circuit breaker (On/Off) rated at 165A
Power LED
ASR 5000 Hardware Platform Overview