Figure 15: Typical Open-Frame Rack - Juniper M10i Hardware Manual

Chapter 5: Preparing for Router Installation
NOTE: We recommend that you do not install the router in a cabinet. If you mount
the router in a cabinet, be sure that sufficient room is provided for cable management
and cables.
The rack rails must be spaced widely enough to accommodate the router chassis's
external dimensions: 8.7 in. (22.1 cm) high, 18 in. (45.7 cm) deep, and 17.5 in.
(44.5 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 router and rack that are specified in
"Clearance Requirements for Airflow
and Hardware Maintenance" on page 44.
The chassis height of 8.7 in. (22.1 cm) is approximately 5 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 eight
router 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 approximately 79 lb (35.8 kg). If you stack eight fully configured routers in one
rack, it must be capable of supporting about 632 lb (286.7 kg).

Figure 15: Typical Open-Frame Rack

43
Rack Requirements