Juniper OCX1100, Hardware Manual

Page: 37 / 204

CHAPTER 3
Cooling System and Airflow
• Cooling System and Airflow in an OCX1100 Switches on page 17
Cooling System and Airflow in an OCX1100 Switches
The cooling system in an OCX1100-48SX switch consists of four fan modules and a single
fan in each power supply. OCX1100 switches provide back-to-front airflow (air enters
through the vents on the rear panel of the switch chassis), indicated by the label
AIR IN
(AFI)
, or front-to-back (air exhausts through the vents on the rear panel of the switch
chassis), indicated by the label
AIR OUT (AFO)
—depending on the fan modules and
power supplies installed in the switch.
This topic describes:
• Fan Modules on page 17
• Airflow Direction in OCX1100-48SX Switch Models on page 18
•
Front-to-Back Airflow on page 19
•
Back-to-Front Airflow on page 20
• Do Not Install AIR IN (AFI) and AIR OUT (AFO) Components in the Same
Chassis on page 21
•
Positioning the Switch on page 21
Fan Modules
The OCX1100 switches fan modules are hot-insertable and hot-removable
field-replaceable units (FRUs).
All OCX1100-48SX switches are shipped with four fan modules preinstalled in the rear
panel of the switch. Each switch can accommodate four fan modules in the fan module
slots on the rear panel of the switch. The fan module slots are numbered 0 through 3
and each slot has a fan icon next to it.
Figure 9 on page 18 shows the fan module used in an OCX1100 switch:
17 Copyright © 2017, Juniper Networks, Inc.