Simulated Sine Wave
A modified or approximated sine wave AC power output. Simulated (or nonsinusoidal) 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.