You must install only power supplies that have AFI labels in switches in which the fan
modules have AIR IN (AFI) labels.
Front-to-Back Airflow
In the EX4550 switches that have front-to-back airflow, the air intake to cool the chassis
is through the vents on the front panel of the switch, and hot air exhausts through the
vents on the rear panel. See Figure 23 on page 38.
Figure 23: Front-to-Back Airflow Through the EX4550 Switch Chassis
You must install only power supplies that have AFO labels in switches in which the fan
modules have AIR OUT (AFO) labels.
Do Not Install Components with Different Airflow in the Switch
Do not mix power supplies with different airflow labels (AFI and AFO) and fan modules
with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same chassis. If the
fan modules have AIR IN (AFI) labels, the power supplies must have AFI labels; if the fan
modules have AIR OUT (AFO) labels, the power supplies must have AFO labels.
Mixing components with different airflows in the same chassishampers the performance
of the cooling system of the switch and leads to overheating of the chassis.
CAUTION: 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.
Positioning the Switch
In front-to-back airflow, indicated by the label AIR OUT (AFO) on the fan modules and
the label AFO on the power supplies, hot air exhausts through the vents on the rear panel
Copyright © 2015, Juniper Networks, Inc.38
EX4550 Switch Hardware Guide
To Next Page
Loading...
Need help?
Console Connection Settings
