are not mixed. If the fan modules have AIR IN labels, the power supplies must also have
AIR IN labels; if the fan modules have AIR OUT labels, the power supplies must also have
AIR OUT labels.
Mixing components with differentairflows in the same chassis hampers the performance
of the cooling system of the switch and leads to overheating of the chassis.
CAUTION: 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 automatically.
Do not mix fan modules with different wattage. Only use the replacement fan modules
that are designed for use with your product number. See Table 11 on page 41 for the
correct part number for your QFX5110.
CAUTION: Do not mix AC and DC power supplies in the same chassis.
However, if you need to convert a QFX5110 to have a different airflow, you can change
the airflow pattern. To convert an AIR IN product SKU to an AIR OUT product SKU or an
AIR OUT product SKU to a AIR IN product SKU, you must replace all of the fans and power
supplies at one time to use the new direction. The system raises an alarm when the
system is converted, which is normal.
QFX5110 Fan Module LED
Figure 14 on page 44 shows the location of the LED next to the fan module.
Figure 14: Fan Module LED in a QFX5110 Switch
g050487
CO
CON
ALM
SYS
MST
ID
RESET
CO
1
1— Fan LED
Table 12 on page 45 describes the function of the fan tray LED.
Copyright © 2019, Juniper Networks, Inc.44
QFX5110 Switch Hardware Guide
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