Juniper QFX5200 Hardware Manual page 82

Table 30: Rack Requirements for the QFX5200
Rack Requirement Guidelines
Rack type 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
(document number EIA-310–D) published by the Electronics Industry Association.
Mounting bracket The holes in the mounting brackets are spaced at 1 U (1.75 in. or 4.45 cm), so that the
hole spacing switch can be mounted in any rack that provides holes spaced at that distance.
Rack size and
•
Ensure that the rack complies with the standards for a 19-in. or 23-in. rack as defined in
strength
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
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 23.25
in. (59.1 cm) to 30.6 in. (77.7 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.
(href="http:/ /www.etsi.org">http:/
Cabinets, Racks, Panels, and Associated Equipment
Equipment Engineering (EE); European
/www.etsi.org).
73