Chapter 3 Preparing The Site For M320 Router Installation; Figure 21: Typical Open-Frame Rack - Juniper M320 Hardware Manual

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Chapter 3: Preparing the Site for M320 Router Installation
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 router and rack.
Two sets of holes are used in the mounting brackets and front-mount flanges to attach
the chassis to a rack. The holes within each set are spaced at 2 U (3.5 in. or 8.9 cm) and
3 U (5.25 in. or 13.3 cm). The router; can be mounted in any rack that provides holes
spaced at those distances.
The mounting holes for connecting the mounting brackets to the chassis are spaced
0.984 in. (25 mm) apart.
The chassis height of 34.80 in. (88.4 cm) is approximately 20 U. A is the standard rack
U
unit defined in Cabinets, Racks, Panels, and Associated Equipment (document number
EIA-310-D) published by the Electronics Industry Association. You can stack two M320
routers in a rack that has at least 40 U (70 in. or 1.78 m) of usable vertical space.
The rack must be strong enough to support the weight of the fully configured router, up
to 439 lb (199.6 kg). If you stack two fully configured routers in one rack, it must be
capable of supporting about 878 lb (399.1 kg).

Figure 21: Typical Open-Frame Rack

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