V

V is for Visual Basic

V Series: Data transmission standards for telephone lines created by the ITU-T (formerly known as CCITT). More...

V.10: An ITU-T interface recommendation; electrically similar to RS-423 (unbalanced, high speed). More...

V.11: An ITU-T interface recommendation; electrically similar to RS-422. More...  

V.110: Async rate adaption (for ISDN) at speeds up to 19.2 Kbps. More...  

V.120: Async rate adaption (for ISDN) at speeds up to 64 Kbps; uses statistical multiplexing. More...  

V.17: An ITU-T standard 2-wire modem for facsimile applications with rates up to 14 400 bit/s. More...  

V.21: An ITU-T standard 300 bps duplex modem standardized for use in the general switched telephone network; similar to RS-422 and Bell 103. More...  

V.22: An ITU-T standard 1200 bps duplex modem standardized for use in the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits; similar to Bell 212. More...  

V.22bis: An ITU-T standard 2400 bps duplex modem using the frequency division technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits. More...  

V.23: An ITU-T standard 600/1200-baud modem standardized for use in the general switched telephone network; similar to Bell 202. More...  

V.24: An ITU-T standard interface recommendation that defines interchange circuits; similar to and operationally compatible with RS-232. More info.  

V.25: An ITU-T standard automatic answering equipment and general procedures for automatic calling equipment on the general switched telephone network including procedures for disabling of echo control devices for both manually and automatically. More...  

V.25bis: An ITU-T standard synchronous and asynchronous automatic dialing procedures on switched networks. More...  

V.26: An ITU-T standard 2400 bps modem standardized for use on 4-wire leased telephone-type circuits; similar to Bell 201 B. More info.

V.26bis: An ITU-T standard 2400/1200 bps modem standardized for use in the general switched telephone network; similar to Bell 201 C. More...  

V.26ter: An ITU-T standard 2400 bps duplex modem using the echo cancellation technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits. More...  

V.27: An ITU-T standard 4800 bps modem with manual equalizer standardized for use on leased telephone-type circuits; similar to Bell 208A. More...  

V.27bis: An ITU-T standard 4800/2400 bps modem with automatic equalizer standardized for use on leased telephone-type circuits. More...  

V.27ter: An ITU-T standard 4800/2400 bps modem standardized for use in the general switched telephone network; similar to Bell 208 B; used for 4800-bps fax communication. More...  

V.28: An ITU-T interface recommendation that defines electrical characteristics for the interchange circuits defined by V.24; similar to and operationally compatible with RS-232. More...  

V.29: An ITU-T standard 9600 bps modem standardized for use on point-to-point 4-wire leased telephone-type circuits; similar to Bell 209; used for 9600-bps fax communication. More...  

V.32: An ITU-T family of 2-wire, duplex modems operating at data signaling rates of up to 9600 bps for use on the general switched telephone network and on leased telephone-type circuits. More...  

V.32bis: An ITU-T standard duplex modem operating at data signaling rates of up to 14 400 bps for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits. More info.  

V.34: An ITU-T standard modem operating at data signaling rates of up to 33 600 bps for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits. More...

V.36: An ITU-T standard modems for synchronous data transmission using 60-108 kHz group band circuits; replaced V.35. More...  

V.42: An ITU-T standard for an error-correction protocol for modems using an async-to-sync conversion; defines LAP-M protocol. More...  

V.42bis: An ITU-T standard for a protocol, based on V.42 with added data compression. More...  

V.54: An ITU-T standard describing loop test devices for modems. More...  

V.90: An ITU-T standard digital modem and analogue modem pair for use on the Public Switched Telephone Network (PSTN) at data signaling rates of up to 56 000 bps downstream and up to 33 600 bps upstream. More...

V.Fast: A preliminary version of V.34 operating at signaling rates of up to 28 800 bps.

Value of Lost Load (VOLL) - measures the inconvenience, damage and replacement costs that customers incur when service in curtailed or interrupted.

VB: (Visual Basic) Microsoft programming language. More... 

VBA (Visual Basic for Applications): Microsoft development technology for rapidly customizing rich-client desktop packaged applications and integrating them with existing data and systems. VBA offers a set of programming tools based on the Microsoft Visual Basic development system. More...

VBScript: Microsoft scripting language for use in browsers. See also JavaScript.

VDSL: Very high bit rate Digital Subscriber Line is similar to ADSL. It uses coaxial, fiber-optic, or twisted-pair cables for short distance (300 – 1800 meters). The downstream bit range is 50-55 Mbps and the upstream is 1.5-2.5 Mbps. See also xDSL.

Veronica: A Gopher service that provides keyword searching of gopher menu items.

Vertical Integration: An arrangement whereby the same company owns all the different aspects of making, selling, and delivering a product or service. In the electric industry, it refers to the historically common arrangement whereby a utility would own its own generating plants, transmission system, and distribution lines to provide all aspects of electric service.  [DOE Glossary of Electricity Terms]

VHF (Very High Frequency): Radio waves in the 30 MHz to 300 MHz range using line-of-sight propagation.

VINES (Virtual Integrated Network Service), Banyan's VINES is a proprietary protocol family derived from the Xerox's XNS protocols.  The Banyan suite includes the following protocols: VARP - VINES Address Resolution Protocol, VIP - VINES Internet Protocol, ICP - Internet Control Protocol, RTP - Routing Update Protocol, IPC - InterProcess Communications Protocol, SPP - Sequenced Packet Protocol, NetRPC - NetRemote Procedure Call, and StreetTalk. More...

Virtual circuit: In packet switching, a network facility that gives the appearance to the user of an actual end-to-end circuit; a dynamically variable network connection where sequential data packets may be routed differently during the course of a virtual connection. Virtual circuits enable transmission facilities to be shared by many users simultaneously. 

Virtual Private Network (VPN): A VPN (virtual private network) is a way to use a public telecommunication infrastructure, such as the Internet, to provide remote offices, individual users, or remote field locations with secure access to their organization's network. A virtual private network can be contrasted with an expensive system of owned or leased lines that can only be used by one organization. The goal of a VPN is to provide the organization with the same capabilities, but at a much lower cost. A VPN works by using the shared public infrastructure while maintaining privacy through security procedures and tunneling protocols such as the Layer Two Tunneling Protocol (L2TP). In effect, the protocols, by encrypting data at the sending end and decrypting it at the receiving end, send the data through a "tunnel" that cannot be "entered" by data that is not properly encrypted. An additional level of security involves encrypting not only the data, but also the originating and receiving network addresses. VPNs provide security router-to-router, but do not provide application-to-application security.

Virus: A program designed to replicate itself without the users knowledge on that user's computer. Often these viruses are destructive to the user's computer. Virus protection should always be installed on a computer to prevent infection.. A virus is a piece of programming code usually disguised as something else that causes some unexpected and usually undesirable event. A virus is often designed so that it is automatically spread to other computer users. Viruses can be transmitted as attachments to an e-mail note, as downloads, or be present on a diskette or CD. The source of the e-mail note, downloaded file, or diskette you've received is often unaware of the virus. Some viruses wreak their effect as soon as their code is executed; other viruses lie dormant until circumstances cause their code to be executed by the computer. Some viruses are playful in intent and effect ("Happy Birthday, Ludwig!") and some can be quite harmful, erasing data or causing your hard disk to require reformatting. Generally, there are three main classes of viruses:

Visual Basic: Microsoft programming language.

VLAN (Virtual Local Area Network): Virtual LANs on the same physical LAN

VLF (Very Low Frequency): Radio waves in the 3 KHz to 30 KHz range using surface propagation.

VLSM: Variable Length Subnet Masks

Voltage Deviation - Slow change of the voltage taking place with a rate of less than 1% of the rated voltage per second.

Voltage Oscillations - Short-term changes of voltage taking place with a rate of more than 1 % of the rated voltage per second.

Voltage Reduction: Any intentional reduction of system voltage by 3 percent or greater for reasons of maintaining the continuity of service of the bulk electric power supply system.  [DOE Glossary of Electricity Terms]

VSAT (Very Small Aperture Terminal): transceiver for satellite communications.

VT100: A standard terminal type developed by Digital Equipment, supported by many computer systems, and emulated by many terminals or personal computers which are not themselves VT100 terminals.