Cooling System Components And Descriptions; Ptx5000 Cooling System Description; Fan Trays - Juniper PTX5000 Hardware Manual

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Cooling System Components and

Descriptions

PTX5000 Cooling System Description on page 27

The cooling system components work together to keep all components within the

acceptable temperature range. The host subsystem monitors the temperature of the

components. If the maximum temperature specification is exceeded and the system

cannot be adequately cooled, the Routing Engine shuts down some or all of the hardware

Fan Trays on page 27

Airflow on page 29

Air Filters on page 29

Power Supply Cooling System on page 31

If a fan fails or the temperature rises above the temperature thresholds, the speed of the

remaining fans in the zone is automatically adjusted to keep the temperature within the

acceptable range.

All fan trays are hot-insertable and hot-removable.

The cooling system contains the following fan trays:

Cooling zone 0—One vertical fan tray (

components installed in the rear card cage: Routing Engines, Control Boards, and SIBs.

The vertical fan tray is not interchangeable with the horizontal fan trays. The fans in

are set to a default speed of 21% of maximum speed.

) with fourteen fans cools the following

Chapters

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