Juniper Networks MX480 - Manual (Page 79)

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 65 .
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 Electronics Industry Association. 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).
Figure 30: Typical Open-Frame Rack
Spacing of Mounting Bracket Holes
The router can be mounted in any rack that provides holes or hole patterns spaced at 1
U (1.75 in.) increments. The mounting brackets used to attach the chassis to a rack are
designed to fasten to holes spaced at those distances.
55 Copyright © 2013, Juniper Networks, Inc.
Chapter 3: Preparing the Site for MX480 Router Installation