V.32 bis

International standard for data communications using a modem at speeds of up to 14,400 bits per second.

V.34 bis

International standard for data communications using a modem at speeds of up to 28,800 bits per second. When purchasing a modem, the user should look for this feature.

Validity

The extent to which a situation observed reflects the actual situation.

VHF

Very High Frequency. A radio frequency in the very high range of the radio spectrum, from 30 to 300 MHz.

Videoconferencing

Actual-time, generally two way transmission of digitized video images between multiple locations; uses telecommunications to bring people at physically remote locations together for meetings. Each individual location in a videoconferencing system requires a room equipped to send and receive video.

Video Frame Grabber

An instrument that changes an analog video signal into a set of digital values.

Virtual Circuit

Packet switched network facilities that appear to be an actual end-to-end circuit.

Virtual Reality

A computer-based technology for simulating visual, auditory, and other sensory aspects of complex environments to create an illusion of being a three-dimensional world. That world is designed by the computer, and viewed through a special headset that responds to your head movements while a glove responds to your hand movements. For example, while in a virtual room you may move your hand up in order to fly or tap to change the color of a wall.

VTC

Video Teleconferencing.