Juniper Networks EX4200 - Manual (Page 59)

Figure 23: Airflow Through the EX4200 Switch Chassis
The fan tray used in an EX4200 switch comes with load-sharing redundancy that
can tolerate a single fan failure at room temperature (below 45° C/113° F) to still
provide sufficient cooling.
Temperature sensors in the chassis monitor the temperature within the chassis. The
system raises an alarm if the fan fails or if the temperature inside the chassis rises
above permitted levels. If the temperature inside the chassis rises above the threshold,
the system shuts down automatically and the temperature shutdown LED on the
rear panel is lit. You can see the status of fans and the temperature from the
Show
Environment Status option in the Status menu in the LCD panel.
Related Topics ■ Field-Replaceable Units in EX3200 and EX4200 Switches on page 16
■ Rear Panel of an EX4200 Switch on page 11
■ Prevention of Electrostatic Discharge Damage on EX Series Switches on page 236
■ Installing a Fan Tray in an EX3200 or EX4200 Switch on page 132
■ Removing a Fan Tray from an EX3200 or EX4200 Switch on page 174
Uplink Modules in EX3200 and EX4200 Switches
EX3200 and EX4200 switches support three types of uplink modules:
■ SFP uplink module—Provides four ports for 1-gigabit small form-factor pluggable
(SFP) transceivers.
■ SFP+ uplink module—Provides two ports for 10-gigabit small form-factor
pluggable (SFP+) transceivers when configured to operate in 10-gigabit mode
Uplink Modules in EX3200 and EX4200 Switches ■ 33
Chapter 2: Component Descriptions