Juniper QFX5100, Hardware Manual

Page: 43 / 256

CHAPTER 3
Cooling System and Airflow
• Cooling System and Airflow in a QFX5100 Switch on page 25
Cooling System and Airflow in a QFX5100 Switch
The cooling system in an QFX5100 switch consists of fan modules and a single fan in
each power supply. The number of fan modules vary depending whether the switch is a
1 U or 2 U product model. All models can be set up to work in one of two airflow directions:
• Airflow In–Air comes into the switch through the vents in the field-replaceable units
(FRUs)
•
Airflow Out–Air comes into the switch through the vents in the port panel.
CAUTION: Airflow In and Airflow Out fans and power supplies cannot be
mixed in the same chassis.
This topic describes:
•
Fan Modules on page 25
•
Do Not Install Components with Different Airflow or Wattage in the Switch on page 29
• Fan Module Status on page 30
Fan Modules
The fan modules in QFX5100 switches are hot-insertable and hot-removable
field-replaceable units (FRUs). These fan modules are designed for one of the two
available airflow directions (Airflow In or Airflow Out). Some modules are also color-coded
for the airflow direction as well. The fan modules are installed in the fan module slots
on the management panel of the switch next to the power supplies.
Both the 1 U and 2 U models of QFX5100 fan modules have a similar design with different
dimensions. The 1 U models of QFX5100 switches have 5 fan modules numbered 0
through 4 from left to right, where the 2 U model, QFX5100-96S, has 3 fan modules
numbered 0 through 2. On all product SKUs, each fan module slot has a fan icon next to
it.
25 Copyright © 2014, Juniper Networks, Inc.