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Figure 20: Back-to-Front Airflow Through the EX4500 Switch Chassis
Front
Rear
Fans (5)
g020816
Each fan tray has colored intake or exhaust labels that are visible through the fan tray
vents. The
INTAKE
label is orange. The
EXHAUST
label is green.
NOTE:
Only one of the labels,
INTAKE
or
EXHAUST
, is visible through the
vents of the installed fan tray.
The color of the label visible through the vents of the installed fan tray must match the
color of the ejector lever on the installed power supply. The color match indicates that
the power supply has the correct airflow for this model. See
.
CAUTION:
To prevent overheating of the chassis, verify that the color of the
label visible through the vents of the installed fan tray matches the color of
the ejector lever of the installed power supply. A color match indicates that
the direction of airflow through the fan tray matches the direction of airflow
of the power supply.
Temperature sensors in the chassis monitor the temperature within the chassis. The fan
tray used in the switch comes with load-sharing redundancy that can tolerate a single
fan failure at room temperature (below 113° F/45° C) to still provide sufficient cooling.
Under normal operating conditions, the fans in the fan tray run at less than full speed. If
a fan fails or the ambient temperature rises above the threshold 113° F (45° C), the speed
of the remaining fans is automatically adjusted to keep the temperature within the
acceptable range, 32° F (0° C) through 113° F (45° C).
The system raises an alarm if the fan fails or if the ambient temperature inside the chassis
rises above the acceptable range. If the temperature inside the chassis rises above the
threshold temperature, the system shuts down automatically.
35
Copyright © 2015, Juniper Networks, Inc.
Chapter 2: Component Descriptions
Содержание EX4500-40F-BF
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Страница 217: ...PART 5 Switch and Component Maintenance Routine Maintenance on page 201 199 Copyright 2015 Juniper Networks Inc ...
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Страница 221: ...PART 6 Troubleshooting Switch Issues Troubleshooting Switch Issues on page 205 203 Copyright 2015 Juniper Networks Inc ...
Страница 222: ...Copyright 2015 Juniper Networks Inc 204 Complete Hardware Guide for EX4500 Ethernet Switches ...
Страница 225: ...PART 7 Returning Hardware Returning the Switch or Switch Components on page 209 207 Copyright 2015 Juniper Networks Inc ...
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Страница 285: ...PART 9 Compliance Information Compliance Information on page 269 267 Copyright 2015 Juniper Networks Inc ...
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