Juniper Networks MX240 manual Rack Requirements, Rack Size and Strength

Chapter 3: Preparing the Site for Router Installation

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 20 on page 32.

The following sections describe rack requirements:

■Rack Size and Strength on page 31

■Spacing of Mounting Bracket Holes on page 32

■Connection to Building Structure on page 32

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 Electronics Industry Association (http://www.eia.org).

With the use of adapters, the router is designed to fit into a 600-mm-wide 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). Use approved wing devices to narrow the opening between the rails.

The rack rails must be spaced widely enough to accommodate the router chassis's external dimensions: 8.71 in. (22.1 cm) high, 24.5 in. (62.2 cm) deep, and

17.45in. (44.3 cm) wide. 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 32.

In an open-frame rack, center-mounting the chassis in the rack is preferable to front-mounting because the more even distribution of weight provides greater stability.

For instructions about installing the mounting hardware, see “Installing the Mounting Hardware” on page 41.

The chassis height of 8.71 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 several MX240 routers in a rack that has sufficient usable vertical space.

The rack must be strong enough to support the weight of the fully configured router, up to 128 lb (58.1 kg). If you stack multiple fully configured routers in one rack, it must be capable of supporting the combined weight of the routers.

Rack Requirements ■ 31