Juniper QFX5110, Hardware Manual

Page: 46 / 222

Figure 9: QFX5110 Fan Module
You remove and replace a fan module from the FRU end of the chassis. The switch
continues to operate for a limited period of time (30 seconds) during the replacement
of the fan module without thermal shutdown.
NOTE: All fan modules must be installed for optimal operation of the switch.
The fan modules are available in two product SKUs that have different airflow directions,
airflow in and airflow out. Airflow in is indicated on the module by the azure blue color
and a label marked
AIR IN . Airflow in this version of the fan module bring air into the fans
and power supplies and exhaust air through the ports. Likewise, airflow out is indicated
by a gold color and a label marked
AIR OUT
. Airflow out versions of the fan module brings
air into the switch through the vents around the ports and exhaust air through the fans
and power supplies.
Table 12 on page 26 lists the available fan module product SKUs
and the direction of airflow in them.
Table 12: Fan Modules in the QFX5110
Power Supplies
Direction of Airflow in
the Fan Module Color of Fan
Module Label on the
Fan Module
Airflow Diagram Fan Module
You must install
only power
supplies that
have
AIR IN labels
in switches in
which the fan
modules have
AIR
IN
labels.
FRU-to-port, that is, air
comes in from the end of
the switch with the fans;
air exhausts from the
switch end with ports
(also known as
back-to-front airflow). Juniper Azure
Blue AIR IN Figure 10 on page 27 QFX5110-48S-FANAFI
You must install
only power
supplies that
have
AIR OUT
labels in switches
in which the fan
modules have
AIR
OUT labels.
Port-to-FRU, that is, air
comes in through vents
on the end with ports; air
exhausts out the end with
the fans (also known as
front-to-back airflow). Juniper Gold
AIR OUT
Figure 11 on page 28 QFX5110-48S-FANAFO
Copyright © 2017, Juniper Networks, Inc. 26
QFX5110 Switch Hardware Guide