| v-mail |
Video mail. Sending video clips as attachments to e-mail messages.
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| v-net |
The plain old telephone system that uses voice signals for communication.
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| 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.
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| 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.
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| 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).
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| 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.
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| 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.
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| V.25 |
An ITU standard for automatic modems which determines the answer tone and circuitry used.
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| V.25bis |
An ITU standard for equipment that performs automatic calling and answering on dial-up telephone lines.
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| 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).
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| 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.
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| V.32ter |
A revision of the ITU-T V.32bis modem protocol standard to allow data transmission at 19000 bits per second.
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| V.90 |
An International Telecommunication Union (ITU) standard for 56-Kbps modems.
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| VAC or V AC |
Volts Alternating Current.
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| vaccine program |
A computer program that watches for viruses and alerts the user if a virus is found.
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| 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.
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| 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.
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| 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.
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| validation |
- 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.
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| 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.
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| 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.
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| 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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| vaporware |
Software that is announced long before it is ready for sale, and that sometimes never materializes.
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| VAR |
Value Added Reseller or Value Added Retailer. 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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| variable bit rate |
(VBR). Asynchronous transfer mode (ATM) service in which bandwidth is guaranteed based on average cell rate.
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