Cooling System And Airflow; Cooling System And Airflow In A Qfx5100 Device; Fan Modules - Juniper QFX5100 Hardware Manual

CHAPTER 3

Cooling System and Airflow

Cooling System and Airflow in a QFX5100 Device

Fan Modules

Copyright © 2016, Juniper Networks, Inc.
Cooling System and Airflow in a QFX5100 Device on page 39
The cooling system in an QFX5100 device consists of fan modules and a single fan in
each power supply. The number of fan modules vary depending whether the size of the
switch is 1 U or 2 U high. All switches 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 39
Do Not Install Components with Different Airflow or Wattage in the Switch on page 43
Fan Module Status on page 44
The fan modules in QFX5100 devices 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 fan 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 versions of QFX5100 fan modules have a similar design with different
dimensions. The 1 U QFX5100 devices have 5 fan modules numbered 0 through 4 from
left to right, where the 2 U, QFX5100-96S device, has 3 fan modules numbered 0 through
2. On all QFX5100 devices, each fan module slot has a fan icon next to it.
Figure 22 on page 40 shows the 1 U fan module and
fan module.
Figure 23 on page 40 shows the 2 U
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