Juniper QFabric QFX3000-G Hardware Documentation page 138

QFX3000-G QFabric System Hardware Documentation
Cooling System and Airflow in a QFX5100 Device
Fan Modules
88
Installing and Removing QFX5100 Device Hardware Components on page 665
Connecting a QFX5100 Device to a Network for Out-of-Band Management
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.
Fan Modules on page 88
Do Not Install Components with Different Airflow or Wattage in the Switch on page 92
Fan Module Status on page 93
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 52 on page 89 shows the 1 U fan module and
fan module.
Figure 53 on page 89 shows the 2 U
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