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Figure 8: Airflow Through Non-PoE Models of EX2200 Switches
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Chassis rear
Chassis front
Fans
Figure 9 on page 16 shows the airflow in an EX2200 switch with network ports in which
PoE is available.
Figure 9: Airflow Through PoE Models of EX2200 Switches
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Chassis rear
Chassis front
Fans Fan
Under normal operating conditions, the fans operate at reduced speed to reduce noise.
Temperature sensors in the chassis monitor the temperature within the chassis. If any
fan fails or if the temperature inside the chassis rises above the threshold, the switch
raises an alarm and all functioning fans operate at a higher speed than normal. If the
Copyright ©2010,Juniper Networks,Inc.16
CompleteHardwareGuide forEX2200 EthernetSwitches