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SRX5800 Rack and Cabinet Requirements
SRX5800 Services Gateway Rack-Mounting Hardware
The rack-mounting hardware for the SRX5800 Services Gateway 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.
SRX5800 Services Gateway Rack Size and Strength Requirements
The size, strength, and location of the rack must accommodate the services gateway's weight and external dimensions. The location of the rack must allow for the clearance requirements specified in Clearance Requirements for SRX5800 Services Gateway Airflow and Hardware Maintenance.
The chassis is 17.37 in. (44.11 cm) wide. The services gateway 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 services gateway 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 services gateway: 27.75 in. (70.49 cm) high (approximately 16 U). You can stack three services gateways in a rack that is at least 48 U (89.3 in. or 2.24 m) in height.
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 services gateway. 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 services gateway, up to 400 lb (182 kg). If you stack three fully configured services gateways, it must be capable of supporting up to 1,200 lb (545 kg).
Spacing of Rack-Mounting Bracket Holes for the SRX5800 Services Gateway
The services gateway 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.
Connection to Building Structure for the SRX5800 Services Gateway Rack
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.
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 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.