Dell PowerConnect J-8208, Hardware Manual

Page: 80 / 276

Table 30: Rack Requirements and Specifications for a J-EX8208 Switch
Guidelines Rack Requirement
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 type and mounting bracket hole
spacing
• 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.
Rack size and strength
• 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.
Rack connection to the building
structure
64
Dell PowerConnect J-Series J-EX8208 Ethernet Switch Hardware Guide