Chapter 1. VBOB Site Preparation and Specifications

The VBOB is shipped ready for rackmounting or it can be used as a table-top unit.

See Chapter 2, “Rackmounting and Hardware Overview” for information on mounting a VBOB chassis in an SGI 3000 series rack.

Site Preparation

Table 1-1 provides site preparation information for a single VBOB chassis.

Table 1-1. Cooling and Power Requirements

Specification

Value Per Server

Cooling requirements

256 Btu/hour

Power consumption

128 watts maximum

AC input to power supply

100-120/200-240 Vac at 50-60 Hz, 4/2A (autoranging)

Inrush current

5 amps maximum

Nominal current draw

0.8 amps @ 100-120 Vac, 0.4 amps @ 200 -240 Vac

UPS volt-amp rating

250 VA

As shown in Figure 1-1, the airflow in the chassis flows through the mesh grill at the front of the chassis, through the power supply enclosure, and over the motherboard. The hot air exhausts out the back of the chassis.


Caution: Always keep at least 4 inches (10.2 cm) of clearance at the back of the chassis for cooling.

Figure 1-1. Chassis Airflow Diagram


Technical Specifications

Table 1-2 lists physical and environmental specifications.

Table 1-2. Physical and Environmental Specifications

Specification

Value Per VBOB

Chassis Dimensions

3.5” in height (2U) x 17.5” in width x 20.5” in length (8.9 cm height [2U] x 44.4 cm width x 52 cm length) [Length includes rear BNCs]

Weight ( Installed)

36 lb (16.4 kg) maximum

Installation Orientation

Any, with 4 in. (10.2 cm) clearance at back

Acoustic noise

50 dBA approximate

Air temperature
Operating
Non-operating

 

+41 to +95 °F (+5 to +35 °C)
-40 to +149 °F (-40 to +65 °C)

Thermal gradient
Operating
Non-operating

 

18 °F (10 °C) per hour (maximum)
108 °F (60 °C) per hour (maximum)

A ltitude
Operating
Non-operating

 

10,000 ft (3,048 m) MSL (maximum)
40,000 ft (12,192 m) MSL (maximum)

Relative humidity
Operating
Non-operating

 

10% to 85%, noncondensing
5% to 95%, noncondensing


Mechanical shock
Operating
Non-operating

 

30G, 3ms (vertical) 15G, 3ms (horizontal)
critical velocity 200 in/s, critical acceleration 50G, 11ms (trapezoidal)

Mechanical vibration
Operating
Non-operating

 

0.25G, 5-500-5Hz, @1 oct/min
0.5G, 3-200-3Hz, @1 oct/min