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Glossary
3
3I0
Acronym for Three-I-Zero. Abbreviation for inverse of
Three-Phase Neutral Current
3-Phase (VARs)
Abbreviation for Three-Phase Reactive Power (Vr is an
abbreviation for VAR)
3-Phase (Watts)
Abbreviation for Three-Phase Real Power
5
5U
A rack unit or U (less commonly RU) is a unit of measure
(standard rack specification as defined in EIA-310) used to
describe the height of equipment intended for mounting in
a 19-inch rack or a 23-inch rack (The 19-inch or 23-inch
dimension refers to the width of the equipment mounting
frame in the rack i.e. the width of the equipment that can be
mounted inside the rack). One rack unit is 1.75 inches
(44.45 mm) high. The rack unit is also specified as the unit
of height in the Eurocard standard.
The size of a piece of rack-mounted equipment is
frequently described as a number in "U". For example, one
rack unit is often referred to as "1U", 2 rack units as "2U"
and so on.
A typical full size rack is 44U, which means it holds just
over 6 feet of equipment, and a typical half-height rack
would be 18-22U, or around 3 feet high.
A
ANSI
Acronym for American National Standards Institute, a
publisher of standards
ASCII
Acronym for American Standard Code for Information
Interchange, an eight-bit character-based code
B
Baud (rate)
The unit for signaling rate of a communications circuit. It is
equal to the number of transitions (voltage or frequency
changes) that are made per second. Often used
erroneously as equivalent to bits per second. Baud and bits
per second are equivalent only at rates of 300/second and
lower. A V.22bis modem generates 1200 bps at 600 baud.
Baud was named after French engineer Jean Maurice
Emile Baudot (1845-1903).
Binary
The binary numeral system, or base-2 number system,
represents numeric values using two symbols,
0 and 1.
BMP
A graphics file in bitmap (bump) format; these files have a
.bmp extension and can be sent to the Windows Clipboard
C
Ch
Abbreviation for Channel
COM
Abbreviation for Communication as in COM Port
COMTRADE
Acronym for Common Format for Transient Data
Exchange. Source: IEEE Std C37.111-1999, IEEE
Standard Common Format for Transient Data Exchange
(COMTRADE) for Power Systems.
COMNAMES
Standardized file naming convention, part of IEEE Std
C37.232, IEEE Standard Common Format for Transient
Data Exchange (COMTRADE) for Power Systems.
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