4.2.1 Dual Power Supply
The Enhanced Chassis (VB300) is delivered with two 100–240V AC / 75W power supplies, providing
power redundancy. Each VB300 unit consists of a 1RU chassis with 3 option slots. In normal operation
load is shared between the two power supplies. If mains fall-out occurs for one of the power sources or
one of the power supplies fails, the power supply still in operation will take the full load, seamlessly. This
means that monitoring operation will not be affected if one of the power sources fails.
4.2.2 Cooling System
The chassis is equipped with six long-life fans that suck in air from front of the chassis. The air exits at the
back of the unit. The fans are temperature controlled, allowing them to run at an optimum speed. Venting
holes at the sides of the chassis provide an optional air intake, ensuring good aerodynamic properties of
the cooling air flow. It is recommended, but not essential, that these venting holes are not covered.
4.3 The Enhanced Chassis –48V DC version (VB300-DC)
The 1RU Enhanced Chassis can house a maximum of 3 modules, and it is equipped with two –48V DC
75W power supplies. The unit is forced air ventilated, the air flow going from front to back. The maximum
power consumption of the chassis with optional modules is 75W. By default all connectors are located at
the front of the unit. The power plugs are located at the rear of the unit. The rack ears of the chassis
may be moved to provide for mid or rear mounting of the unit. The rack ears are designed to support the
weight of the unit.
4.3.1 Dual Power Supply
Figure 4.2: VB300-DC rear: two –48V DC connectors located on the the right
The Enhanced Chassis (VB300-DC) is delivered with two –48V DC / 75W power supplies, providing
power redundancy. Each VB300-DC unit consists of a 1RU chassis with 3 option slots. In normal
operation load is shared between the two power supplies. If mains fall-out occurs for one of the power
sources or one of the power supplies fails, the power supply still in operation will take the full load,
seamlessly. This means that monitoring operation will not be affected if one of the power sources fails.
VB2xx GigE User’s Manual version 5.4 19
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