-C H A P T E R

C H A P T E R 2

Site Requirements

This section provides information you should consider when choosing a location for your Netra 20 system.

The chapter contains the following sections:

Before Installing the Netra 20 Server

Environmental Considerations

Mechanical Considerations

Before Installing the Netra 20 Server

The Netra 20 server is available with either an AC or DC power supply unit.

When locating a site for your system, confirm that the correct AC mains power or DC power can be provided. Refer to Chapter 3 for further information.

Environmental Considerations

The system should be installed in an environment within the following specific parameter ranges:

Ambient temperature

operating: 5° to 40°C (41° to 104°F)

storage: -40° to 70°C (-40° to 158°F)

Relative humidity

operating: 5 to 85% non-condensing ^[1]

storage: 10 to 95% non-condensing

Elevation

operating: 0 to +3000 m (9840 feet)

storage: 0 to +12000 m (39400 feet)

Dimensions

Height: 176.6 mm (6.95 in.) 4U NOM

Width: 445.2 mm (17.52 in.)

Depth: 508.1 mm (20.00 in.)

Weight: maximum 27.3 kg (60 lb)

These dimensions are for the product in its normal 19-inch configuration, but without slide handles fitted; other rack sizes require the use of central rack-mount flange adaptors. The overall width of these flanges varies according to the rack size as shown in FIGURE 2-1.

FIGURE 2-1 Netra 20 System Dimensions and Mounting Options (dimensions in mm)

Forced Air Cooling Requirements

1. Ensure that the airflow through the host equipment frame is adequate. The basic cooling airflow requirement for the Netra 20 system is an installed volumetric airflow rate of 100 cfm per server.

2. Air is drawn through the front of the Netra 20 enclosure and expelled from the rear of the enclosure. The host equipment rack should present as few obstructions to the airflow as possible near the front and rear of the Netra 20 system. The minimum frame ventilation requirement is 250 cm2 free area at both the front and rear face for each installed Netra 20 system.

Unrestricted access to external air is required at the front face. Exhaust airflow from the rear of the Netra 20 system can be directed from the rear of the frame in an open system or through the top of the frame in a closed system (see FIGURE 2-4).

3. If you have fitted the optional air filter, inspect it regularly and replace it, if necessary, to maintain adequate airflow. Air filters are available in packs of ten (part no. X7216A).

FIGURE 2-2 Netra 20 System Airflow

FIGURE 2-3 Netra 20 System Airflow (Open Frame)

FIGURE 2-4 Netra 20 System Airflow (Closed Frame)

Mechanical Considerations

Caution - The Netra 20 system must be installed only by suitably-trained service personnel. When fully configured with hardware, the system can weigh up to 27.3 kg (60 lb). At least two persons are required to install a fully-configured unit.

Mounting Flanges

The Netra 20 chassis has been designed for a wide variety of mounting options and rack sizes. A choice of mounting flanges to suit 19-inch, 23-inch, 24-inch or 600-mm nominal frame widths, and a slide adaptor kit can be ordered as required:

Optional component X7099A (19-inch slide adaptor kit)

Optional component X6902A (23-inch configuration)

Optional component X6903A (24-inch configuration)

Optional component X6904A (600 mm configuration)

Mounting flanges for a 19-inch frame are supplied with the system.

Caution - The instructions in the following paragraphs are for use only by suitably-trained installation engineers.

Select the mounting position most suitable for the rack type and seismic environment (see caution below). Four fixing locations are provided on a Netra 20 system; one at the front, two in the centre and one at the rear.

Fit the mounting flanges in the selected position using the six M5 countersunk screws provided with the mounting kit and a Phillips No. 1 screwdriver. The handles, also supplied in the kit, can be fitted to the mounting flanges before or after you attach the flanges to the system.

To mount the slides, all eight (four per side) M4 screws must be fitted. The recommended tightening torque for the M4 recess head screws is 1.7 Nm (1.25 lbf-ft).

Secure the system within the rack frame using screws suitable for the equipment frame. Their size depends on the frame requirements, but they must be at least
M5 (10/32). All screws must be fitted; there are positions provided for eight screws (four per side) in total. The recommended torque value for the M5 recess head screws is 4.0 Nm (3.0 lbf-ft).

Detailed instructions for fitting the flanges and sliding rails are provided in the Adjustable Rackmount Installation Guide provided with your system.

Caution - For installations located in earthquake risk zones, use at least two hard mounting locations (four flanges). The rack must be bolted to the floor.

Caution - Where systems are installed in racks that are not bolted to the floor, deploy any rack stabilization provided before installing the system.

Removing the Shipping Plates

Remove the two M5 screws securing each plate to the system.

FIGURE 2-5 Shipping Plates

Note - Please retain the plates and system packaging for future use.

^{1 (Footnote) Subject to a maximum absolute humidity of 0.024kg of water per kg of dry air.}