Juniper OCX1100, Hardware Manual

Page: 38 / 204

Figure 9: Fan Module Used in an OCX1100 Switch
CAUTION: You must remove only one fan module at a time for replacement
from the rear panel of the chassis. The switch continues to operate without
thermal shutdown for a limited period of time (30 seconds) during the
replacement of a fan module.
NOTE: Four fan modules must be installed for optimal functioning of the
switch.
The fan modules are available in two models that have different airflow
directions—back-to-front (air enters through the vents on the rear panel of the switch
chassis), indicated by the label
AIR IN (AFI)
, and front-to-back (air exhausts through the
vents on the rear panel of the switch chassis), indicated by the label
AIR OUT (AFO)
.
Table 12 on page 18 lists the available fan module models and the direction of airflow in
them.
Table 12: Fan Modules in OCX1100-48SX Switches
Label on the Fan Module Fan Module
AIR OUT (AFO) OCX-FAN-X-AFO
AIR IN (AFI)
OCX-FAN-X-AFI
Airflow Direction in OCX1100-48SX Switch Models
Table 13 on page 18 shows the direction of airflow in OCX1100-48SX switch models as
shipped.
Table 13: Airflow Direction in OCX1100-48SX Switch Models
Direction of Airflow Fan Modules and Power Supply Model Number
Front-to-back—that is, air intake to cool the
chassis is through the vents on the front panel
of the chassis and hot air exhausts through
the vents on the rear panel of the chassis. The switch ships with four fan modules and
two AC power supplies installed; all bearing
the label
AIR OUT (AFO)
.
OCX1100-48SX-AFO
Copyright © 2017, Juniper Networks, Inc. 18
OCX1100 Switch Hardware Guide