Sun Microsystems StorageTek 6540, Support Manual

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Chapter 2 Cabinet and Environmental Specifications 9
Cabinet Height
Cabinet design is described based on EIA-STD-310-D, which describes usable cabinet
space in terms of a vertical modular unit-called a ’U’. One U equals 44.45 mm or 1.75
inches of internal vertical space.
Standard equipment racks come in a variety of heights from small units around
356mm (14") high that can provide 8U of equipment space to 2223mm (87.5") high or
50U of equipment space. Customized racks can be even taller.
For safety, access, air flow and other design considerations, it is recommended that
the height of the cabinet to be used is no more than 1880mm (74") high or 42U of
equipment space.
Caution – Fully-populated expansion trays have the bulk of their weight in the
front; therefore, it is important to remember that tall cabinets will be front-heavy,
and have a potential for tip-over. It is recommended that the top-most trays be
removed before moving a cabinet. Also tip-over prevention legs must be used before
extending trays.
ADVERTENCIA: Para asegurar de que el centro de gravedad del armario se
encuentre en un nivel seguro durante su transporte o desplazamiento, se requiere
que:
O
la instalación se efectúe en una configuración de 1 x 8 como máximo (sin
dispositivos serie B o serie D por encima de 28U)
O
no existan espacios vacíos en la parte inferior del armario
O
el armario sea desplazado por una pendiente no superior a 10 grados
Cabinet Width
Equipment racks come in a variety of widths from 19 inches to 24 inches. System
design considerations in this document are for a 19-inch rack configuration only as
defined in the Electronic Industries Association (EIA) and American National
Standards Institute (ANSI) standard ANSI/EIA-310-D-1992 Cabinets, Racks, Panels,
and Associated Equipment.
Not all equipment racks are built to EIA-310-D specifications, so verify that the
cabinet about to used is compliant. Accessories and rail kits may not install
successfully in equipment racks that are not EIA-310-D compliant.