Juniper OCX1100, Hardware Manual

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Table 3: Airflow Direction in Power Supply for OCX1100 Switches
Direction of Airflow Label on Power Supply Power Supply Rating
Back-to-front—that is, air intake to cool the
chassis is through the vents on the rear panel of
the chassis and hot air exhausts through the vents
on the front panel of the chassis. AIR IN (AFI) 460 W AC
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.
AIR OUT (AFO)
460 W AC
Back-to-front—that is, air intake to cool the
chassis is through the vents on the rear panel of
the chassis and hot air exhausts through the vents
on the front panel of the chassis.
AIR IN (AFI)
800 W DC
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.
AIR OUT (AFO)
800 W DC
For more information, see “Cooling System and Airflow in an OCX1100 Switches” on
page 17 .
CAUTION: Do not install:
•
AC and DC power supplies in the same chassis.
•
AC power supplies in DC switch models or DC power supplies in AC switch
models.
• Power supplies with different airflow labels ( AIR IN (AFI) and AIR OUT
(AFO) ) in the same chassis.
• Power supplies and fan modules with different airflow labels ( AIR IN (AFI)
and AIR OUT (AFO) ) in the same chassis.
Fan Modules
The fan modules in OCX1100 switches are hot-insertable and hot-removable
field-replaceable units (FRUs). OCX1100-48SX switches are shipped with four fan
modules preinstalled in the rear panel of the switch.
The fan modules are available in two models that have different airflow
directions—back-to-front airflow, indicated by the label
AIR IN (AFI) and front-to-back
airflow, indicated by the label AIR OUT (AFO) . See “Cooling System and Airflow in an
OCX1100 Switches” on page 17 .
5 Copyright © 2017, Juniper Networks, Inc.
Chapter 1: System Overview