Clearance Requirements For Airflow And Hardware Maintenance For A J-Ex8216 - Dell PowerConnect J-EX8216 Hardware Manual

Dell PowerConnect J-Series J-EX8216 Ethernet Switch Hardware Guide
Table 34: Cabinet Requirements and Specifications for a J-EX8216 Switch
Cabinet Requirement
Cabinet size and clearance
Cabinet airflow requirements
Related
Documentation
72
Rack-Mounting and Cabinet-Mounting Warnings for J-EX Series Switches on page 215
Guidelines for the J-EX8216 Switch
NOTE: The J-EX8216 switch can be installed only on a
four-post rack or cabinet. Installation on a two-post rack is
not supported.
The minimum cabinet size for accommodating a J-EX8216
switch is 23.62 in. (60 cm) wide and 36.0 in. (91.4 cm) deep.
Large cabinets improve airflow and reduce the chance of
overheating. To accommodate a single J-EX8216 switch in
a four-post rack, the cabinet must be at least 21 U high (or
22 U if you install the power cord tray, which is optional for
the four-post rack).
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
With adequate cooling air and airflow clearance, you can
stack two J-EX8216 switches in a cabinet with a four-post
rack that has at least 42 U of usable vertical space. (44 U
are required if you install the optional power cord tray.) In
all cases, the rack must meet the strength requirements to
support the weight of the installed switches.
When you mount the switch on a cabinet, ensure that
ventilation through the cabinet is sufficient to prevent
overheating. Consider the following requirements list when
planning for chassis cooling:
Ensure that the cool air supply you provide through the
cabinet adequately dissipates the thermal output of the
switch (or switches).
Ensure that the cabinet allows the chassis hot exhaust air
to exit the cabinet without recirculating into the switch. An
open cabinet (without a top or doors) that employs hot air
exhaust extraction from the top allows the best airflow
through the chassis. If the cabinet contains a top or doors,
perforations in these elements assist with removing the hot
air exhaust. For an illustration of chassis airflow, see
"Clearance Requirements for Airflow and Hardware
Maintenance for a J-EX8216 Switch" on page 73.
The switch fans exhaust hot air through the right side of the
chassis (the left side when you face the front of the chassis,
where the fan tray slides in). Install the switch in the cabinet
in a way that maximizes the open space on the fan tray side
of the chassis. This maximizes the clearance for critical
airflow.
Route and dress all cables to minimize the blockage of
airflow to and from the chassis.
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-EX8216 Switch" on page 73.
).