Cooling System Components And Descriptions; T640 Cooling System Description; Airflow - Juniper T640 Hardware Manual

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Cooling System Components and

Descriptions

T640 Cooling System Description on page 31

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

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

router components. When the router is operating normally, the fans function at lower

than full speed. If a fan fails or the ambient temperature rises above a threshold, the

speed of the remaining fans is automatically adjusted to keep the temperature within

the acceptable range. If the ambient maximum temperature specification is exceeded

and the system cannot be adequately cooled, the Routing Engine shuts down some or

all of the hardware components.

Airflow on page 31

Fan Trays on page 32

Air Filters on page 33

Power Supply Cooling System on page 33

Figure 15 on page 32

shows the airflow through the router.

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