Cooling System And Airflow; Cooling System And Airflow In An Ex4600 Switch; Fan Modules - Juniper EX4600 Series Hardware Manual

CHAPTER 3

Cooling System and Airflow

Cooling System and Airflow in an EX4600 Switch

Fan Modules

* Optics, Fans and Power supply sold separately for EX4600-40F-S.
Copyright © 2014, Juniper Networks, Inc.
Cooling System and Airflow in an EX4600 Switch on page 13
The cooling system in an EX4600 switch consists of five fan modules and a single fan
in each power supply. The switch 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 13
Do Not Install Components with Different Airflow or Wattage in the Switch on page 16
Fan Module Status on page 17
The fan modules in EX4600 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) and are the same fan units used
in the QFX5100 Series of switches. 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. The fan module slots are
numbered 0 through 4 from left to right. Each slot has a fan icon next to it.
Figure 6 on page 14 shows the fan module for the EX4600.
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