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cables. The FCC (Federal Communications Commission) regulates a portion of this problem
through Part 15 of their rules and regulations. Even more stringent than the FCC Part 15
requirements, Network Equipment Building Standards (NEBS) covers a large range of
requirements including criteria for personnel safety, protection of property, and operational
continuity. The documents cover both physical requirements including: Space Planning,
Temperature, Humidity, Fire, Earthquake, Vibration, Transportation, Acoustical, Air Quality
and Illumination; and electrical criteria including: Electrostatic Discharge (ESD), Electromagnetic
Interference (EMI), Lightning and ac Power Fault, Steady State Power Induction, Corrosion,
dc Potential Difference, Electrical Safety and Bonding and Grounding.
O-R
PCA
Abbreviation for Printed Circuit Assembly also referred to as a Printed Circuit Board (PCB).
PCI
Currently, the most popular local I/O bus, the Peripheral Component Interconnect (PCI) bus
was developed by Intel and introduced in 1993.
PICMG
A consortium of companies involved in utilizing PCI for embedded applications. The PCI
Industrial Computer Manufacturers Group (PICMG) controls the PICMG specification.
Power factor
The ratio of true power to apparent power in an ac circuit. In power conversion technology,
power factor is used in conjunction with describing the ac input current to the power supply.
RMS
Root-mean-square (rms) refers to the most common mathematical method of defining the
effective voltage or current of an ac wave. To determine rms value, three mathematical operations
are carried out on the function representing the ac waveform: (1) The square of the waveform
function (usually a sine wave) is determined. (2) The function resulting from step (1) is averaged
over time. (3) The square root of the function resulting from step (2) is found.
S-T
Theoretical
Represents the maximum wattage of a given configuration, assuming worst-case conditions
maximum power
(thermal tolerances, workloads, and so forth) on all system components. It is extremely unlikely
consumption
that any customer will experience this level of power consumption.
Tonnage
The unit of measure used in air conditioning to describe the heating or cooling capacity of a
system. One ton of heat represents the amount of heat needed to melt one ton (2,000 lbs.) of ice
in one hour. 12,000 Btu/hr. equals one ton of heat.
True power
In an ac circuit, true power is the actual power consumed. It is distinguished from apparent
power by eliminating the reactive power component that may be present.
Typical input
The operating current of the product measured using a typical load and target voltage.
current
Typical power
Represents the expected power consumption of a given configuration. The typical value is the
consumption
approximate power consumption that a customer will most likely experience and can use for
power budgeting purposes.
U-Z
Vapor seal
A vapor seal is an essential part of preventing moisture infiltration into or migration out of a
critical space, such as a data processing center or other room that contains sensitive electronic
instrumentation. Essentially, a vapor seal is a barrier that prevents air, moisture, and
contaminants from migrating through tiny cracks or pores in the walls, floor, and ceiling into
the critical space. Vapor barriers may be created using plastic film, vapor-retardant paint, vinyl
wall coverings and vinyl floor systems, in combination with careful sealing of all openings
(doors and windows) into the room.
Watt
A unit of electricity consumption representing the product of amperage and voltage. When the
power requirement of a product is listed in watts, you can convert to amps by dividing the
wattage by the voltage. (e.g., 1200 watts divided by 120 volts is 10 amps.
14
Glossary
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