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V

Word Explanation
V and H Coordinates

Jay K. Donald of AT&T in 1975 developed the Vertical and Horizontal (V and H) coordinates system to determine the distance between telephone switching centers. Square root of one-tenth of a mile forms the basic unit of this distance measuring technique. This system allows usage of a slide rule in the field. Certain telephone rate calculating applications still use this system, which uses the following formula to compute distance between two telephone exchanges:Distance in miles = square_root (((V1-V2)2 +(H1-H2)2) /10)

V-Band

V-Band, also known as Q-Band, is a radio bandwidth range between 40 GHz t0 50 GHz.

v-mail

Video mail. Sending video clips as attachments to e-mail messages.

v-net

The plain old telephone system that uses voice signals for communication.

V.21

An ITU-T modem protocol standard for asynchronous, full-duplex transmission, a data rate of 300 bits per second, and frequency shift keying (FSK) modulation.

V.22

An ITU-T modem protocol standard for synchronous and asynchronous, full-duplex transmission, with data rates of up to 1200 bits per second, and differential phase shift keying (DPSK) modulation.

V.22bis

(V.22bis means V.22 twice). An ITU-T modem protocol standard for synchronous and asynchronous, full-duplex transmission, with data rates of up to 2400 bits per second, and quadrature amplitude modulation (QAM).

V.23

An ITU-T modem protocol standard for synchronous and asynchronous half-duplex transmission at 1200 bits per second, using frequency shift keying (FSK) modulation.

V.24

An ITU-T standard that defines the way circuits are set up for an RS-232 interface between a computer and modem or other data terminal equipment and data communications equipment. It also defines modem carrier frequencies that will not interfere with regular telephone control tones.

V.25

An ITU standard for automatic modems which determines the answer tone and circuitry used.

V.25bis

An ITU standard for equipment that performs automatic calling and answering on dial-up telephone lines.

V.32

An ITU-T modem protocol standard for synchronous and asynchronous bidirectional transmission at 4800 or 9600 bits per second, using Trellis code modulation (TCM).

V.32bis

(V.32 twice). An ITU-T modem protocol standard for synchronous and asynchronous bidirectional transmission at 7200, 12000 and 14400 bits per second, using Trellis code modulation (TCM). The modem changes the speed of transmission as necessary for the transmission line used.

V.32ter

A revision of the ITU-T V.32bis modem protocol standard to allow data transmission at 19000 bits per second.

V.90

An International Telecommunication Union (ITU) standard for 56-Kbps modems.

VAC or V AC

Volts Alternating Current.

vaccine program

A computer program that watches for viruses and alerts the user if a virus is found.

vacuum tube

A sealed glass or metal container, evacuated to a high degree of vacuum, through which a controlled flow of electrons is directed. The first computers used vacuum tubes as on/off switches to indicate the 0s and 1s in digital computations. Now cathode ray tubes (CRTs) are used for computer monitors.

VAD

Value Added Dealer. Same as VAR. A company which sells something made by another company after adding something of value. For example, the VAD might put together a computer, peripherals, and specialized software, all from different companies, as a package.

VAD: Voice Activity Detector

Voice Activity Detector (VAD) is the device that detects voice activity and allows DTX to operate. VAD, in conjunction with DTX reduces power consumption in the mobile station and RF interference in the system by muting the transmitter when there is no voice to transmit.

valid hit

A visit to a web page that delivers all information to the user. Hits such as error messages, redirects, and computer-generated visits are not valid hits.

validation
  1. The evaluation of software at the end of its development, to make sure it meets the requirements of the intended user(s). 2. The process of checking data to make sure it is correct and presented in the proper format. 3. The checking of communications packets by the receiving device.
value added dealer

(VAD). Same as VAR. A company which sells something made by another company after adding something of value. For example, the VAD might put together a computer, peripherals, and specialized software, all from different companies, as a package.

value added reseller

(VAR). A company which sells something made by another company after adding something of value. For example, the VAR might put together a computer, peripherals, and specialized software, all from different companies, as a package.

value added retailer

(VAR). A company which sells something made by another company after adding something of value. For example, the VAR might put together a computer, peripherals, and specialized software, all from different companies, as a package.

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