Positioning the Switch
In front-to-back airflow, indicated by the label AIR OUT (AFO) on the fan modules and power supplies,
hot air exhausts through the vents on the rear panel of the switch. In back-to-front airflow, indicated by
the label AIR IN (AFI) on the fan modules and power supplies, hot air exhausts through the vents on the
front panel of the switch.
In data center deployments, position the switch in such a manner that the AIR IN (AFI) labels on switch
components are next to the cold aisle, and AIR OUT (AFO) labels on switch components are next to the
hot aisle.
Fan Module Status
Each fan module in the switch has a status LED next to the fan module slot on the rear panel of the chassis,
which indicated the fan module status.Table 13 on page 39 describes the status LED on the fan module
in an EX4650 switch.
Table 13: Fan Module Status LED
DescriptionStateColorLED
The fan module is functioning normally.On steadilyGreenStatus
An error has been detected in the fan module. Replace the fan
module as soon as possible. Either the fan has failed or it is
seated incorrectly. To maintain proper airflow through the
chassis, leave the fan module installed in the chassis until you
are ready to replace it.
BlinkingAmber
Under normal operating conditions, the fan modules operate at a moderate speed. Temperature sensors
in the chassis monitor the temperature within the chassis.
The system raises an alarm if a fan module fails or if the ambient temperature inside the chassis rises above
the acceptable range. If the temperature inside the chassis rises above the threshold temperature, the
system shuts down automatically.
39
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