Juniper Networks J2350 manual Rack Size and Strength for J4350 and J6350 Routers

Chapter 4: Preparing for Router Installation

The J2320 chassis height of 1.75 in. (4.45 cm) equals 1 U. The J2350 chassis height of 2.61 in. (6.63 cm) equals 1.5 U. Each U is a standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published by the Electronics Industry Association.

Rack Size and Strength for J4350 and J6350 Routers

The Services Router is designed for installation in a rack that complies with either of the following standards:

■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)

■A 600-mm 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)

The horizontal spacing between the rails in a rack that complies with this standard is usually wider than the router's mounting ears, which measure 19 in. (48.2 cm) from outer edge to outer edge. Use approved wing devices to narrow the opening between the rails as required.

The rack rails must be spaced widely enough to accommodate the router chassis's external dimensions: 3.44 in. (8.74 cm) high, 17.44 in. (44.3 cm) wide, and 21.13 in. (53.67 cm) deep.

The outer edges of the mounting ears extend the width of either chassis to 19.44 in. (48.38 cm), and the front of the chassis extends approximately 0.5 in. (1.27 cm) beyond the mounting ears. The spacing of rails and adjacent racks must also allow for the clearances around the router and rack. (See “General Site

Guidelines” on page 63.)

CAUTION: If you are mounting the router in a cabinet, be sure that ventilation is sufficient to prevent overheating.

If a front-mount rack is used, we recommend supporting the back of the router with a shelf or other structure.

The J4350 and J6350 chassis height of 3.44 in. (8.74 cm) equals 2 U. Each U is a standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published by the Electronics Industry Association.

Connection to Building Structure

Always secure the rack to the structure of the building. If your geographical area is subject to earthquakes, bolt the rack to the floor. For maximum stability, also secure the rack to ceiling brackets. For more information, see “Rack-Mounting Requirements and Warnings” on page 217.

Rack Requirements ■ 65