Juniper QFX3500, Hardware Documentation

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Table 22: Rack Requirements for the QFX5110
Guidelines Rack Requirement
Use a four-post rack that provides bracket holes or hole patterns spaced at
1 U (1.75 in. or 4.45 cm) increments and that meets the size and strength
requirements to support the weight.
A U is the standard rack unit defined in Cabinets, Racks, Panels, and Associated
Equipment (document number EIA-310–D) published by the Electronics
Industry Association.
Rack type
The holes in the mounting brackets are spaced at 1 U (1.75 in. or 4.45 cm), so
that the switch 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. or 23-in. rack
as defined in Cabinets, Racks, Panels, and Associated Equipment (document
number EIA-310–D) published by the Electronics Industry Association.
•
A 600-mm rack as defined in the four-part Equipment Engineering (EE);
European telecommunications standard for equipment practice (document
numbers ETS 300 119-1 through 119-4) published by the European
Telecommunications Standards Institute.
The horizontal spacing between the rails in a rack that complies with this
standard is usually wider than the device's mounting brackets, which measure
19 in. (48.26 cm) from outer edge to outer edge. Use approved wing devices
to narrow the opening between the rails as required.
•
Ensure that the rack rails are spaced widely enough to accommodate the
switch chassis’ external dimensions. The outer edges of the front-mounting
brackets extend the width to 19 in. (48.26 cm).
•
For four-post installations, the front and rear rack rails must be spaced
between 23.6 in. (60 cm) and 36 in. (91.4 cm) front-to-back.
•
The rack must be strong enough to support the weight of the switch.
•
Ensure that the spacing of rails and adjacent racks allows for proper
clearance around the switch 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
110