Juniper SRX 5800, Руководство по оборудованию, Страница: 169 / 536

SRX5800 Services Gateway Cabinet Size and Clearance Requirements
The minimum size cabinet that can accommodate the device depends on the type of power supplies
installed:
•
If only standard-capacity power supplies are installed, the services gateway will fit inside a standard 600
mm wide by 800 mm deep cabinet.
•
If high-capacity AC or DC power supplies are installed, the services gateway must be installed in a cabinet
that is at least 600 mm wide by 1000 mm deep.
See “Clearance Requirements for SRX5800 Services Gateway Airflow and Hardware Maintenance” on
page 166 for chassis width and depth dimensions. A cabinet larger than the minimum requirement provides
better airflow and reduces the chance of overheating. To accommodate a single device, the cabinet must
be at least 16 U high. If you provide adequate cooling air and airflow clearance, you can stack three devices
in a cabinet that has at least 48 U (84 in. or 2.13 m) of usable vertical space.
SRX5800 Services Gateway Cabinet Airflow Requirements
When you mount the services gateway in a cabinet, you must ensure that ventilation through the cabinet
is sufficient to prevent overheating. Following is a list of requirements to consider when planning for
chassis cooling:
•
Ensure that the cool air supply you provide through the cabinet can adequately dissipate the thermal
output of the device.
•
Ensure that the cabinet allows the chassis hot exhaust air to exit from the cabinet without recirculating
into the device. 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.
•
Install the device as close as possible to the front of the cabinet so that the cable management system
just clears the inside of the front door. This maximizes the clearance in the rear of the cabinet for critical
airflow.
•
Route and dress all cables to minimize the blockage of airflow to and from the chassis.
170