• Clearance Requirements for Airflow and Hardware Maintenance for a QFX3500 Device
on page 102
• Mounting a QFX3500 Device in a Rack or Cabinet on page 261
Cabinet Requirements for a QFX3100 Director Device
You can mount the QFX3100 Director device in a cabinet that contains a 19-in. rack.
Cabinet requirements consist of:
•
Cabinet size
•
Clearance requirements
•
Cabinet airflow requirements
Table 26 on page 97 provides the cabinet requirements and specifications for the QFX3100
Director device.
Table 26: Cabinet Requirements and Specifications for the QFX3100 Director Device
Guidelines
Cabinet
Requirement
•
You can mount the QFX3100 Director device in a cabinet that contains a 19-in. rack as defined in
Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published by the
Electronics Industry Association.
NOTE: The rack must meet the strength requirements to support the weight of the QFX3100 Director
device.
•
The minimum cabinet size must be able to accommodate the maximum external dimensions of the
QFX3100 Director device.
Cabinet size
•
The outer edges of the mounting brackets extend the width of the chassis to 19 in. (48.3 cm).
•
The minimum total clearance inside the cabinet is 29.2 in. (74.17 cm) between the inside of the front
door and the inside of the rear door.
Cabinet clearance
When you mount the QFX3100 Director device in a cabinet, ensure that ventilation through the cabinet
is sufficient to prevent overheating.
•
Ensure adequate cool air supply to dissipate the thermal output of the QFX3100 Director device or
devices.
•
Ensure that the cabinet allows the chassis hot exhaust air to exit the cabinet without recirculating into
the QFX3100 Director device. An open cabinet (without a top or doors) that employs hot air exhaust
extraction from the top allows the best airflow through the chassis. If the cabinet contains a top or
doors, perforations in these elements assist with removing the hot air exhaust.
•
Install the QFX3100 Director device in the cabinet in a way that maximizes the open space on the side
of the chassis that has the hot air exhaust. This maximizes the clearance for critical airflow.
•
Route and dress all cables to minimize the blockage of airflow to and from the chassis.
•
Ensure that the spacing of rails and adjacent cabinets allows for the proper clearance around the
QFX3100 Director device and cabinet.
•
A cabinet larger than the minimum required provides better airflow and reduces the chance of
overheating.
Cabinet airflow
requirements
97Copyright © 2012, Juniper Networks, Inc.
Chapter 6: Rack and Cabinet Requirements
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