NOTE: The quiet upper front fan tray and quiet lower front fan tray are
not interchangeable with each other. In addition to the labels, the quiet
upper fan tray also has an upward pointing arrow above the four fan
icons on the faceplate.
The quiet upper front fan tray is labeled FAN-T-FTOP-S and UPPER FANTRAY (see
Figure 16 on page 33).
Figure 16: Quiet Upper Front Fan Tray
g006045
FAN-T-FTOP-S
UPPER FANTRAY
The quiet lower front fan tray is labeled FAN-T-FBOT-S and LOWER FANTRAY (see
Figure 17 on page 33).
Figure 17: Quiet Lower Front Fan Tray
g006046
FA N T- BTO P-S
LOWER FA N TR AY
FAN-T-FBOT-S
LOWER FANTRAY
All fan trays are hot-insertable and hot-removable.
Air Filters
The cooling system contains a front air filter and a rear air filter. All air filters are
hot-insertable and hot-removable.
Power Supply Cooling System
The power supply cooling system consists of the following:
•
Each DC power supply contains one fan that cools that power supply.
•
Each AC power supply contains two fans that cool that power supply.
Related
Documentation
• T640 Hardware Component Overview on page 13
• Maintaining the T640 Air Filters on page 444
• Maintaining the T640 Fan Trays on page 445
33Copyright © 2017, Juniper Networks, Inc.
Chapter 4: Cooling System Components and Descriptions
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