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Telecom Dictionary - V

V - The abbreviation for volt.  (See Volt.)

V Series - ITU-T standards that regulate data communications over the telephone network.

VA - This stands for volt-ampere and is a measurement of power.  It is just the voltage multiplied by the ampere level of the current.

Variance - The average of the squared deviation (difference from the mean).

Vertical Refresh Rate - The number of times per second a monitor redraws its screen.

Very High Frequency (VHF) - This frequency spectrum portion is between 30 MHz and 300 MHz in frequency.

Very Low Frequency (VLF) - This frequency spectrum portion between 3 KHz and 300 KHz.

VHF - see Very High Frequency.

Video - The portion of communications that we see with our eyes: still pictures but mainly motion pictures.

VLF - see Very Low Frequency.

Virus - A software program that replicates itself and harms computers on a network.

Volt - The unit of measurement of electromotive force; it is the force needed to push an ampere of current through a resistance of one ohm.

VRAM - Video RAM (see Random Access Memory).

VSAT - This stands for Very Small Aperture Terminal, and refers to small earth stations, usually with an aperture between 1.2 and 2.4 meters. See USAT.

VSWR - This stands for Voltage Standing Wave Ratio, and is a way to measure the amount of mismatch in a cable, waveguide, or antenna system.