Juniper QFX5240 - Page 42

Table 11: Fan Module Status LEDs
Color State Descripon
Green On steadily Fan is funconing normally.
Red On steadily Equipment is faulty and
malfunconing.
Unlit O Fan module input power failed.
Under normal operang condions, the fan modules operate at a moderate speed. Temperature sensors
in the chassis monitor the temperature within the chassis.
The system raises an alarm if a fan module fails or if the ambient temperature inside the chassis rises
above the acceptable range. If the temperature inside the chassis rises above the threshold temperature,
the system shuts down automacally.
Airow
The switch has a front-to-back (airow out or AFO) cooling system. The switch pulls air through the
front of the chassis toward the fan modules, which exhaust the air out of the switch. See Figure 21 on
page 36.
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