Table 25: Rack Requirements for the QFX3500 Device (continued)
GuidelinesRack Requirement
The holes in the mounting brackets are spaced at 1 U (1.75 in. or 4.45 cm), so that the
device can be mounted in any rack that provides holes spaced at that distance.
Mounting bracket hole
spacing
•
Ensure that the rack complies with the standards for a 19-in. rack as defined in Cabinets,
Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the
Electronics Industry Association.
•
Ensure that the rack rails are spaced widely enough to accommodate the device chassis’
external dimensions. The outer edges of the front-mounting brackets extend the width
to 19 in. (48.26 cm).
•
The front and rear rack rails must be spaced between 28 in. (71.1 cm) and 36 in. (91.4
cm) front-to-back.
•
The rack must be strong enough to support the weight of the device.
•
Ensure that the spacing of rails and adjacent racks allows for proper clearance around
the device and rack.
Rack size and strength
•
Secure the rack to the building structure.
•
If earthquakes are a possibility in your geographical area, secure the rack to the floor.
•
Secure the rack to the ceiling brackets as well as wall or floor brackets for maximum
stability.
Rack connection to
building structure
RELATED DOCUMENTATION
Chassis Physical Specifications for a QFX3500 Chassis
Rack-Mounting and Cabinet-Mounting Warnings | 224
Clearance Requirements for Airflow and Hardware Maintenance for a QFX3500 Device | 125
Mounting a QFX3500 Device in a Rack or Cabinet | 328
Rack Requirements
You can mount the device on two-post racks or four-post racks.
Rack requirements consist of:
•
Rack type
•
Mounting bracket hole spacing
115
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