Cisco Cisco Packet Data Interworking Function (PDIF) Documentation Roadmaps
ASR 5000 Hardware Platform Overview
▀ Fan Tray Assemblies
▄ Cisco ASR 5000 Series Product Overview
OL-22938-01
Fan Tray Assemblies
There are two fan tray assemblies within the chassis. A lower fan tray provides air intake 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 are automatically adjusted based on temperature or failover situations.
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 are automatically adjusted 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 Switch Management Card (SMC) notifies all operable fans in the system to switch to high speed and
generates an alarm.
condition, the Switch Management Card (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 air into the chassis from the lower front and sides of the
chassis. The air is then pushed upward across the various cards and midplane within the chassis to support vertical
convection cooling.
chassis. The air is then pushed upward across the various cards and midplane within the chassis to support vertical
convection cooling.
Figure 11. Lower Fan Tray Assembly