Chapter 1. VBOB Site Preparation and Specifications

Chapter 1. VBOB Site Preparation and Specifications
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The VBOB is shipped as a table-top unit but it can also be rackmounted.

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	75 W maximum
AC input to power supply	100-120/200-240 VAC at 50-60 Hz, 2/1A (autoranging)
Inrush current	35 A maximum
Nominal current draw	1.1 A @ 100-120 VAC, 0.6 A @ 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 of 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 21.0 in. length (8.9 cm height [2U] x 44.4 cm width x 53.3 cm length) [Length includes rear BNCs]
Weight ( installed)	20 lb (16.4 kg) maximum
Installation orientation	Any, with 4 in. (10.2 cm) clearance at back
Acoustic noise	43 dBA approximate
Air temperature Operating Non-operating	+41 to +95 °F (+5 to +35 °C), up to 5,000 ft altitude -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)
Altitude Operating Non-operating	10,000 ft (3,048 m) MSL (maximum), derated 1 °C per 1,000 ft above 5,000 ft altitude (i.e. 30 °C temp at 10,000 ft) 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	15 G, 3 ms (horizontal and vertical, half-sine wave) 30 G, 10 ms (horizontal and vertical, trapezoidal wave)
Mechanical vibration Operating Non-operating	0.25 G, 5-500 Hz, @ 1 oct/min 0.5 G, 3-300 Hz, @ 1 oct/min

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About This Guide		Chapter 2. Rackmounting and Hardware Overview