Dell PowerConnect J-8208 Hardware Guide - Page 80

Dell PowerConnect J-Series J-EX8208 Ethernet Switch Hardware Guide Table 30: Rack Requirements and Specifications for a J-EX8208 Switch Rack Requirement Guidelines Rack type and mounting bracket hole spacing Use a four-post rack or a two-post rack. You can mount the switch on any four-post or two-post rack that provides bracket holes or hole patterns spaced at 1 U (1.75 in./4.44 cm) increments and that meets the size and strength requirements specified in this table. 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 (http://www.eia.org). You can stack three J-EX8208 switches in a four-post rack that has at least 42 U; if you install the optional power cord tray, a minimum of 45 U are required. You can stack three J-EX8208 switches in a two-post rack that has 45 U (installing the power cord tray is mandatory for two-post rack installations). In all cases, the rack must meet the strength requirements to support the weight. Rack size and strength Rack connection to the building structure • Ensure that the rack is 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). • Ensure that the rack is one of the following standard lengths: • 23.62 in. (600 mm) • 30.0 in. (762 mm) • 21.5 in. (546 mm) • Ensure that the rack rails are spaced widely enough to accommodate the J-EX8208 switch chassis' external dimensions of 24.25 in. (61.6 cm) height, 17.25 in. (43.815 cm) width, 20 in. (50.8 cm) depth. The outer edges of the front-mounting brackets extend the width to 19 in. (48.3 cm). • The J-EX8208 switch chassis height of 24.25 in. (61.6 cm) is approximately 14 U. If you install the power cord tray (optional for four-post rack installations, mandatory for two-post rack installations), the chassis and power cord tray consume 15 U. • The rack must be strong enough to support the weight of the fully configured switch. A fully configured J-EX8208 switch weighs up to 284 lb (130 kg). If you stack three fully configured J-EX8208 switches in one rack, that rack must support up to 852 lb (487 kg). • Ensure that the spacing of rails and adjacent racks allows for the proper clearance around the switch and rack as specified in "Clearance Requirements for Airflow and Hardware Maintenance for a J-EX8208 Switch" on page 67. • Secure the rack to the building structure. • If earthquakes are a possibility in your geographical area, secure the rack to the floor. • Secure the rack to the ceiling brackets as well as wall or floor brackets for maximum stability. 64