Specifications

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GLOSSARY
Industry Terms
Simulated Sine Wave
A modified or approximated sine wave AC power output. Simulated (or non-
sinusoidal) waveforms may also be referred to as a squared sine wave, modified
sine wave, trapezoidal sine wave or quasi sine wave.
Sine Wave
A smooth, repetitive oscillation of AC power.
Single Phase Power
Refers to the distribution of alternating current electric power using a system in
which all the voltages of the supply vary in unison.
SMTP
Simple Mail Transfer Protocol is the standard for e-mail transmission on the Internet.
SNMP
Simple Network Management Protocol is a commonly used protocol for devices
to communicate over a network.
Spike
A spike is a sudden, brief power surge, usually lasting less than 1ms.
Standby UPS
A UPS that passes utility power straight through to the output when conditions
are stable, but switches to battery power when utility voltage drops below an
acceptable level.
Surge
Periods when line voltage increases dramatically, typically lasting longer than
1ms, but less than a few seconds, though they can last longer.
Total Harmonic Distortion (THD)
A calculated measure of the reduction in sine wave clarity caused by stray
wave frequencies.
Thermal Dissipation
The process of dissipating heat from an electrical system via air or liquid
cooling; also a term for the amount of heat a device can emit.
Transfer Time
The time it takes UPS to switch from AC power to battery power.
Transformer
A device that converts AC line voltage to a higher or lower value.
U
The standard unit of measure for rack-mounted equipment. A device measuring
1U is 1.75 inches high, 2U is 3.50 inches, etc.
Undervoltage
Related to both brownout and voltage sag, undervoltage falls between these
two, occurring when voltage is lower than normal for an extended period of time
without recovering, but not to low that the electronic device will not function.
USB (HID Compliant)
Universal Serial Bus devices are used to connect various components to a
computer. An HID (Human Interface Device) compliant USB follows a specific
protocol for communication that allows it to be used with virtually any system.
Volt
The difference in electric potential between two points when one amp of current
dissipates one watt of power.
Volt-Ampere
The unit used to express apparent power.
Voltage Regulator
A device or component that normalizes voltage to a certain standard when it
is fluctuating.
Watt
A unit of measure for true power consumption.
Waveform
Is a representation (or form) of how alternating current (AC) varies with time.
Common waveform representations include sine wave, square wave and
trapezoidal wave. An instrument called an oscilloscope can be used to visually
represent a wave as a repeating image on a screen.
Wiring-Fault
Refers to an abnormal flow of current that is due to an improperly grounded
electrical outlet.