Juniper MX480, Hardware Manual

Page: 146 / 420

MX480 Router Rack Requirements
The router can be installed in a rack. Many types of racks are acceptable, including
four-post (telco) racks and open-frame racks. An example of an open-frame rack appears
in
Figure 42 on page 147 .
• Rack Size and Strength on page 146
• Spacing of Mounting Bracket Holes on page 147
•
Connection to Building Structure on page 147
Rack Size and Strength
The router is designed for installation in a 19-in. rack as defined in Cabinets, Racks, Panels,
and Associated Equipment (document number EIA-310-D) published by the Electronic
Components Industry Association (ECIA) (
http://www.ecianow.org
).
With the use of adapters or approved wing devices to narrow the opening between the
rails, the router fits into a 600-mm-wide rack or cabinet , as defined in the four-part
Equipment Engineering (EE); European telecommunications standard for equipment practice
(document number ETSI EN 300 119) published by the European Telecommunications
Standards Institute (
http://www.etsi.org
).
The rack rails must be spaced widely enough to accommodate the router chassis's
external dimensions: 14.0 in. (356 mm) high, 24.5 in. (622 mm) deep, and
17.45 in. (443 mm) wide. The spacing of rails and adjacent racks must also allow for the
clearances around the router and rack that are specified in
“MX480 Router Clearance
Requirements for Airflow and Hardware Maintenance” on page 147 .
In general, a center-mount rack is preferable to a front-mount rack because the more
even distribution of weight in the center-mount rack provides greater stability.
For instructions about installing the mounting hardware, see “Installing the MX480 Router
Mounting Hardware for a Rack or Cabinet” on page 174 .
The chassis height of 14.0 in. (35.6 cm) is approximately 8 U. A U is the standard rack
unit defined in
Cabinets, Racks, Panels, and Associated Equipment (document number
EIA-310-D) published by the Electronic Components Industry Association (ECIA)
(
http://www.ecianow.org
). You can stack five MX480 routers in a rack that has at least
48 U (84 in. or 2.13 m) of usable vertical space.
The rack must be strong enough to support the weight of the fully configured router, up
to 163.5 lb (74.2 kg). If you stack five fully configured routers in one rack, it must be capable
of supporting up to 818 lb (371.0 kg).
Copyright © 2019, Juniper Networks, Inc. 146
MX480 Universal Routing Platform Hardware Guide