Juniper EX9253 Hardware Manual page 64

Table 25: Rack Requirements and Specifications
Rack Requirement
Rack type
Mounting bracket hole spacing
Rack size and strength
Rack connection to building
structure
Cabinet requirements consist of:
• Cabinet size
• Clearance requirements
• Cabinet airflow requirements
Table 26 on page 56 provides the cabinet requirements and specifications.
Guidelines
You can mount the device on a rack that provides bracket holes or hole
patterns spaced at 1 U (1.75 in. or 4.45 cm) increments and meets the size
and strength requirements to support the weight.
A U is the standard rack unit defined by the Electronic Components Industry
Association (http:/ /www.ecianow.org).
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.
•
Ensure that the rack complies with the size and strength standards of a
19-in. rack as defined by the Electronic Components Industry Association
(http:/ /www.ecianow.org).
•
Ensure that the rack rails are spaced widely enough to accommodate the
external dimensions of the device chassis. The outer edges of the front-
mounting brackets extend the width of the chassis to 19 in. (48.2 cm).
•
The rack must be strong enough to support the weight of the device.
•
Ensure that the spacing of rails and adjacent racks provides for proper
clearance around the device and rack.
•
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.
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