Figure 13: Air Out Airflow Through the QFX5110-32Q
Do Not Install Components with Different Airflow or Wattage in the Switch
Do not mix power supplies with different airflow. If the power supplies are color-coded,
ensure they are either all azureblue for airflow in models or all gold for airflow out models.
If the power supplies are not color-coded but have a label, ensure that the chassis is
either using all airflow in (AFI ) or all airflow out (AFO). Likewise, ensure that all fan
modules have the same airflow and match the airflow of the powersupplies. Fan modules
are also either color-coded azure blue for airflow in or gold for airflow out. If the fan
module has a label instead of being color-coded, ensure that labels (AIR IN and AIR OUT)
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 componentswith different airflows in the same chassishampers 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 12 on page 26 for the
correct part number for your QFX5110.
CAUTION: Do not mix AC and DC power supplies in the same chassis.
29Copyright © 2017, Juniper Networks, Inc.
Chapter 3: Cooling System and Airflow
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