SRX5800 Rack and Cabinet Requirements

The rack-mounting hardware for the SRX5800 Firewall includes:

• The large mounting shelf for mounting in four-post racks, cabinets, and open-frame racks

• The small mounting shelf for front-mounting in a four-post rack or cabinet

• Front-mounting flanges on the front of the chassis for front-mounting in a four-post rack or cabinet

• Two center-mounting brackets attached to the center of the chassis for center-mounting in an open-frame rack. For an open-frame rack, center-mounting is preferable because of the more even distribution of weight.

The size, strength, and location of the rack must accommodate the firewall's weight and external dimensions. The location of the rack must allow for the clearance requirements specified in Clearance Requirements for SRX5800 Firewall Airflow and Hardware Maintenance.

The chassis is 17.37 in. (44.11 cm) wide. The firewall is designed for installation in a standard 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). The spacing of the holes between the left and right front-mounting flanges and center-mounting brackets is 18.31 in (465 mm) apart. However, the inside spacing between the rack rails must allow sufficient space for the width of the chassis.

With the use of adapters or approved wing devices to narrow the opening between the rails, the firewall can fit into a 600-mm-wide rack, as defined in the four-part Equipment Engineering (EE); European telecommunications standard for equipment practice (document numbers ETS 300 119-1 through 119-4) published by the European Telecommunications Standards Institute (http://www.etsi.org).

Observe these guidelines:

• The rack must have sufficient vertical usable space to accommodate the height of the firewall: 27.75 in. (70.49 cm) high (approximately 16 U). You can stack three firewalls in a rack that is at least 48 U (89.3 in. or 2.24 m) in height.

  Note:

  A U is the standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment.

• The location of the rack must provide sufficient space to accommodate the depth of the firewall. The chassis depth from the front mounting flange to the rear of the power supply ranges from 23.0 in. (58.4 cm) to 27.8 in. (70.6 cm) depending on the type of power supply installed.

• The rack must be strong enough to support the weight of the fully configured firewall, up to 400 lb (182 kg). If you stack three fully configured firewalls, it must be capable of supporting up to 1,200 lb (545 kg).

The firewall can be mounted in any rack that provides holes or hole patterns spaced at 1 U (1.75 in.) increments. The mounting brackets used to attach the chassis to a rack are designed (as per EIA-310-D specifications) to fasten to holes spaced at those distances.

Always secure the rack to the structure of the building. If your geographical area is subject to earthquakes, bolt the rack to the floor. For maximum stability, also secure the rack to ceiling brackets.

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 firewall will fit inside a standard 600 mm wide by 800 mm deep cabinet.

• If high-capacity AC or DC power supplies are installed, the firewall must be installed in a cabinet that is at least 600 mm wide by 1000 mm deep.

See Clearance Requirements for SRX5800 Firewall Airflow and Hardware Maintenance 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.

When you mount the firewall 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.