Table 11 on page 32 lists the QFX3500 device FRUs and their direction of airflow.
Table 11: Airflow Direction in QFX3500 Device FRUs
Direction of AirflowModelFRU
FRU-to-portQFX3500-MBRJ-45 management board
Port-to-FRUQFX3500-MB-RJ45-AFO
FRU-to-portQFX3500-MB-SFP-AFISFP management board
Port-to-FRUQFX3500-MB-SFP-AFO
FRU-to-portQFX3500-FANAIFan tray
Port-to-FRUQFX3500-FAN-AFO
FRU-to-port
•
JPSU-650W-AC-AFI
•
QFXC01-PWRACI-650A
AC power supply
Port-to-FRUJPSU-650W-AC-AFO
FRU-to-portJPSU-650W-DC-AFIDC power supply
Port-to-FRUJPSU-650W-DC-AFO
The chassis includes a fan speed-control system. Under normal operating conditions,
fans operate at reduced speed to reduce noise and power consumption.
Temperature sensors in the chassis monitor the temperature within the chassis. The
system raises an alarm if a fan fails or if the temperature inside the chassis rises above
permitted levels. If the temperature inside the chassis rises above the threshold, the
device shuts down automatically. You can see the status of fans and the temperature
remotely through the CLI by issuing the operational mode command show chassis
environment.
You cannot replace a single fan module. If one or more fan modules fail, you must replace
the entire fan tray or management board.
Related
Documentation
Field-Replaceable Units in a QFX3500 Device on page 18•
• Installing a Fan Tray in a QFX3500 Device on page 122
• Removing a Fan Tray from a QFX3500 Device on page 123
• Installing a Management Board in a QFX3500 Device on page 128
• Removing a Management Board from a QFX3500 Device on page 130
Copyright © 2017, Juniper Networks, Inc.32
QFX3500 Device Hardware Documentation
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