Дорожная карта для Cisco Cisco Packet Data Gateway (PDG)
ST16 Hardware Platform Overview
Fan Tray Assemblies ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22937-01
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 Processor Card/Switch Management Card SPC notifies all operable fans in the system to switch to
high speed and generates an alarm.
condition, the Switch Processor Card/Switch Management Card SPC 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 17. Lower Fan Tray Assembly
../../../GRAPHICS/Production/ST-series_Hardware/lft_nofilter.wmf
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 is mounted at the top of the lower fan tray assembly, providing ingress
filtering to remove contaminants before they enter the system. Temperature sensors measure the temperature at various
points throughout the chassis. The system monitors this information, and if it detects a clogged filter, generates a
maintenance alarm.
electronics filtering applications. This filter is mounted at the top of the lower fan tray assembly, providing ingress
filtering to remove contaminants before they enter the system. Temperature sensors measure the temperature at various
points throughout the chassis. The system monitors this information, and if it detects a clogged filter, generates a
maintenance alarm.
Figure 18. Particulate Air Filter
../../../GRAPHICS/Production/ST-series_Hardware/airfilter.wmf
Important:
A replacement air filter is shipped with each chassis. It is recommended that a minimum of one
replacement air filter for each deployed chassis be kept on site. This ensures that qualified service personnel can quickly
replace the filter when needed.
replace the filter when needed.
Upper Fan Tray
The upper fan tray unit contains multiple fans that exhaust air from the upper rear and sides of the chassis.