•
A 19-in. rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document
number EIA-310-D) published by the Electronics Industry Association
(http://www.eia.org).
•
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
(http://www.etsi.org). The horizontal spacing between the rails in a rack that complies
with this standard is usually wider than the mounting brackets, which measure 19 in.
(48.3 cm) from outer edge to outer edge. Use approved wing devices to narrow the
opening between the rails as required.
•
A 23 in. rack using appropriate 23 in. to 19 in. rack adapters and an appropriate
installation shelf which supports the chassis at the correct vertical position to properly
line up the rack mount holes. Juniper Networks does not supply this hardware, but
consideration for the size and weight of the chassis is important for a safe installation.
Juniper recommends the use of single-sided panel adapters of at least 10 U in height,
using as many as needed to fully overlap the chassis rack mount bracket for this type
of installation.
The rack rails must be spaced widely enough to accommodate the chassis's external
dimensions: 62.5 in. (158.8 cm) high, 33.2 in. (84.3 cm) deep, and 17.43 in. (44.3 cm) wide.
The outer edges of the mounting brackets extend the width to 19 in. (48.3 cm). The
spacing of rails and adjacent racks must also allow for the clearances around the chassis
and rack that are specified in “PTX5000 Clearance Requirements for Airflow and
Hardware Maintenance” on page 59. The cable management system on the front of the
chassis adds 3.8 in. (9.7 cm) to the depth.
In an open-frame rack, center-mounting is required because the more even distribution
of weight provides greater stability. For center-mounting, you use the mounting brackets
attached to the center of the chassis for rack mounting.
For instructions about installing the mounting hardware, see “Installing the PTX5000
Mounting Hardware for a Four-Post Rack or Cabinet” on page 67.
The chassis height of 62.5 in. (158.8 cm) high is approximately 35.7 U. 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. You can install one chassis
in a rack that has at least 35.7 U (62.5 in. [158.8 cm] ) of usable vertical space.
The rack must be strong enough to support the weight of the fully configured PTX5000
Packet Transport Switch, up to about 964 lb (438.2 kg).
57Copyright © 2012, Juniper Networks, Inc.
Chapter 5: Preparing for PTX5000 Packet Transport Switch Installation
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