V

V for virtual machine

abbreviation / acronyms	term	definition
V.35		An ITU interface specification for data transmitted at 48 kilobits per second.
v-mail	Video mail	Sending video clips as attachments to e-mail messages.
V H	Vertical and horizontal grid points	used to determine straight-line mileage between locations. The junction point is the called V and H coordinate.
V2P	Virtual to physical	refers to the migration of an operating system (OS), application programs and data from a virtual machine or disk partition to a computer's main hard disk. The target can be a single computer or multiple computers.
VA	virtual assistant	a conversational, computer-generated character that simulates a conversation to deliver voice- or text-based information to a user via a Web, kiosk or mobile interface.
VAD	Value-Added Distributor Voice Activity Detection	Analogous to value-added reseller (IT trade term). A technology that recognizes when a person is speaking and when a person is silent to suppress sending unnecessary noise across a telecommunications line.
VADP	vStorage APIs for Data Protection	VMware's replacement for VCB, integrates backup functionality via vStorage APIs
VAIO	Video Audio Integrated Operation	Sony notebook brand
VAN	Value-Added Network	VANs are public networks that add value to the basic communication provided by common carriers by offering specialized services such as access to commercial data bases, E-mail and video conferencing.
VAR	value-added reseller	An organization that buys equipment from a vendor at a discount, adds value (such as application software packaged and sold with underlying system software) and remarkets it.
VAROS	VAriable Refraction Optical System	Scanner technology by Canon
VATH	Visual, Auditory, Tactile, Haptic	Modalities in Avatar-based Real Time Distributed Virtual Environment.
VAX	Virtual Address Extension	The Digital architecture that was the company's principal product line prior to the Alpha. VAX was enormously successful in DEC's traditional engineering and scientific customer base.
VB	Visual Basic	software product developed by Microsoft. Its purpose is to bring programming down to a drag-and-drop level to speed up development cycles.
VBA	Virtual backup appliance Visual Basic for Applications	VBA is a virtual machine used to back up other virtual machines VBA is the application edition of Microsoft's Visual Basic programming language
vBNS	very high-speed Backbone Network Service	The next generation Internet. Sponsored by the NSF and implemented by MCI, vBNS presently supports data transfer rates of 622Mbs and is expected to eventually support 2.5Gbs speeds.
VBR	variable bit rate Very Busy Run	QoS class defined by the ATM Forum for ATM networks. VBR is subdivided into a real time (RT) class and non-real time (NRT) class. VBR (RT) is used for connections in which there is a fixed timing relationship between samples. IT slang for Very Busy Run, meaning a high traffic network or segment of a network.
VBUG	Voice Browser Usability Group	A group within the W3C developing voice portal usability guidelines and best practices.
VBX	Visual Basic Custom Control	A software module that can be used in many different applications. VBXs were originally created to to make it easy to develop Windows applications with Visual Basic, but can be used in other environments.
Veronica	Very Easy Rodent Oriented Net-wide Index to Computerized Archives	Developed at the University of Nevada, Veronica was a constantly updated database of the names of almost every menu item on thousands of gopherservers. Now made obsolete by web-bases search engines.
VC	Videoconference Virtual Channel virtual circuit	A real-time video session between two or more users or between two or more locations. A connection established between end users, in which packets are forwarded along the same path and bandwidth is not permanently allocated until it is used. Logical circuit created to ensure reliable communication between two network devices. A virtual circuit is defined by a VPI/VCI pair, and can be either PVC or SVC.
VCB	VMware Consolidated Backup	VMware Infrastructure feature
VCC	Voice Call Continuity	VCC is a key aspect of the IMS promise of a seamless user experience.
VCD	Video Compact Disc	This technology was developed by Sony and Philips in 1993, and allows around 70 minutes of compressed MPEG-1 video/audio to be stored on a CD.
VCDX	VMware Certified Design Expert	VMware Certified Design Expert
VCI	Virtual Channel Identifier	Stands for "Virtual Channel Identifier." The VCI, used in conjunction with the VPI (virtual path indicator), indicates where an ATM cell is to travel over a network. ATM, or asynchronous transfer mode, is a method that many ISPs (Internet Service Providers) use to transfer data to client computers.
VCM	Virtual Channel Memory	A type of memory developed by NEC. VCM memory adds some low latency SRAM registers onto standard SDRAM, much like EDO compared to Fast Page Mode memory.
VCO	voltage-controlled oscillator	An oscillator with an output frequency that is a function of an input voltage.
VCP	Value Chain Planning VMware Certified Professional	Oracle's SCP capabilities designed for individuals who want to demonstrate their expertise in virtual infrastructure www.vmware.com/certification/
VCR	video cassette recorder	An analog magnetic recording and playback machine. Usually used for recording and viewing full-motion video; also useful as a data backup device.
VD	Virtual Disk	object presented to the host level for user data storage. At least one physical disk is associated with a VD.
Vdeck	Video Deck	A Super 8 mm tape drive from Sony which can be connected to a computer via the serial port.
VDI	Virtual desktop infrastructure	practice of hosting a desktop operating system within a virtual machine (VM) running on a centralized server. VDI is a variation on the client/server computing model, sometimes referred to as server-based computing (SBC). The term was coined by VMware Inc.
VDR	virtual deal room	a secure, Web-based virtual data room that complements or replaces the paper-based deal room that contains all relevant information needed during the due diligence phase.
VDS	Variable Drop Size visual data stream	Printing technology by NEC In bidirectional text representation, a stream of data that is organized in the sequence in which the data is presented on the screen.
VDSL	very high-speed digital subscriber line	Extremely high-speed DSL connections over short distances.
VDT	Video Display Terminal	A computer terminal with monitor and keyboard; sometimes VDT refers to only the monitor.
VDU	Visual Display Unit	includes a keyboard for input data and a screen for displaying output. The oldest and most popular type of VDU screen is the CRT, which uses essentially the same technology as a television screen.
VEP	vertical enterprise portal	A portal that typically includes a business application and focuses on a specific business function (e.g., investment or customer service) of an enterprise — unlike a HEP, which serves a broad enterprise population.
VESA	Video Electronics Standards Association	An organization to help standardize how PCs implement video technologies. The first standard this organization created was the 800x600 pixel Super VGA (SVGA) display and its software interface. HTTP://WWW.VESA.ORG
VF	Voice Frequency	Voice Frequency
VFM	virtual file manager	IBM System Storage N series VFM software is a comprehensive solution for managing unstructured file data. NetApp VFM simplify your file services and maximize productivity
VGA	Video Graphics Array	A hardware display and software resolution standard for personal computers.
VGF	voice grade facility	Circuit designed to DDD network standards, making it suitable for voice, low-speed data, facsimile or telegraph service.
VHD	Virtual Hard Drive	File format containing the complete contents and structure representing a Hard Disk Drive, and is used to store virtual operating systems and their associated programs in a single file by various virtualization programs or a virtual machine
VHDL	VLSI Hardware Description Language	an industry standard format for describing integrated circuit logic and behavior.
VHF	very high frequency	range of the radio spectrum is the band extending from 30 MHz to 300 MHz. The wavelengths corresponding to these limit frequencies are 10 meters and 1 meter.
VHDTS	Very High Density Thumb Screw	68-pin SCSI connector with manually screwable screws
VHLL	Very-High-Level Language	A high-level language that is very structured, having strict rules that must be followed.
VHM	Voice Health Monitor	Helps system administrators and network managers determine and maintain the stability of the VoIP network within their enterprise by using a series of availability and health checks
VHS	video home system	A videocassette format.
Vodcast	video podcasting	A podcast is a short video clip that is broadcast over the Internet.
VIC	Voice Interface Card	connects the system to either the PSTN or to a PBX.
VIM	Vendor Independent Messaging	An API defined by Apple Computer, Inc.; Borland International, Inc.; Lotus Development Corporation; and Novell, Inc.
Vines	VIrtual NEtwork System	a client/server network designed and marketed by Banyan
VIO	virtual input/output	A type of storage group that allocates data sets to paging storage, which simulates a direct access storage device (DASD) volume.
VIP	VeriSign Identity Protection	cloud-based authentication service that enables enterprises to secure online access and transactions to help obtain compliance and reduce fraud risk
VITAL	VHDL Initiative for the Standardization of ASIC Libraries	A standard for defining the format of integrated circuit simulation libraries.
VIVO	Video In Vide o Out	a graphics card port which enables some video cards to have bi-directional video transfer, originally through a Mini-DIN connector and a specialized splitter cable, but now meaning any kind of video that has both input and output capability.
VLA	Volume License Agreement	A software licensing option offered under the Novell "Customer Connections" program, with an entry point that opens discounts to smaller organizations.
VLAN	virtual local-area network	A set of systems that, regardless of higher-layer addressing or location, is designated as a logical LAN and treated as a set of contiguous systems on a single LAN segment. VLANs can be proprietary or standardized using the IEEE 802.1q specification.
VLC	VideoLan Client	Highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, ...) as well as DVDs, VCDs, and various streaming protocols. See also http://videolan.org
VLDB	very large database	A database measured in terabytes.
VLE	Virtual Learning Environment	A browser dependent software system that enables online interaction between learner and tutor. It combines methods of online communication (such as chatroom, discussion boards and e-mail) with the ability to deliver learning materials
VLF	Very Low Frequency Virtual Log File	Electromagnetic frequencies in the range of 3 to 30 kiloherz. VLF radiation has been a source of health concerns in the use of computer monitors. SQL Server transaction log logical segment
VLIW	Very Long Instruction Word	A microprocessor architecture different from CISC and RISC. VLIW uses encoded instructions that are even more complex than the instructions used in CISC.
VLK	Volume License Key	A single license key which can be used on a number of computers to install a given product. A volume license key is typically issued to an individual company after purchasing a site license for a product.
VLL	Virtual Leased Line	way to provide Ethernet based point to point communication over IP/MPLS networks.
VLR	Visitor Location Register	contains all subscriber data required for call handling and mobility management for mobile subscribers currently located in the area controlled by the VLR.
VLS	Virtual Library Systems	HP StorageWorks backup and recovery solutions
VLSI	Very Large Scale of Integration	The process of placing more than 100,000 transistors on one chip
VLSM	Variable Length Subnet Masking	Used in conjunction with CIDR subnetting. In CIDR, without VLSM, all subnet segments can be any number of bits long, but all segments must be the same length. With VLSM, subnet segments can be defined which use different CIDR masks for each subnet segment, resulting in very economical use of available IP addresses.
VM	virtual machine	An instance of a data-processing system that appears to be at the exclusive disposal of a single user An abstract specification for a computing device that can be implemented in different ways in software and hardware.
VMDQ	Virtual Machine Device Queues	part of the Intel VT-c suite for virtualization environments on Intel Ethernet server adapters.
VMEbus	VersaModule Eurocard bus	an alternative to the PC bus, S-100 bus and others. The original design was 32-bit bus developed jointly by Motorola, Signetics, Mostek and Thompson CSF.
VMI	vendor-managed inventory	vendor-managed inventory
VML	Vector Markup Language	An application of XML used for the markup of vector graphic information in the same way that HTML is used for the markup of text.
VMM	virtual machine monitor	host program that allows a computer to support multiple and identical execution environments in virtualization technology.
VMS	Virtual Memory System Vocabulary Management Solution Voice Message Service	A multiuser, multitasking, virtual memory operating system for the VAX series from Digital Equipment. provides the tools for a software knowledge management system that can be used on both intranets and extranets for managing taxonomies, thesauri, classification schemes, and provides users with the capability to control files and indexes. An Ericsson service that transmits information between DirectTalk and certain switches.
VNC	Virtual Network Computing	A remote display system which allows you to view a computing 'desktop' environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures.
VNL	via net loss	The lowest loss in decibel (dB) at which a trunk facility can be operated considering limitations of echo, crosstalk, noise and singing.
VNO	virtual network operator	virtual network operator is a provider of management services and a reseller of network services from other telecommunications suppliers that does not own the telecommunication infrastructure.
VoD	Video On Demand	A service which allows you to choose from a menu displayed on your TV, a video, TV programme, or training material and play it in real time on your TV.
VoIP	voice over Internet Protocol	VoIP is the transmission of voice communications over IP data networks, such as IP-based LANs, intranets or the Internet. VoIP is defined as basic voice transport and, as opposed to IP telephony, VoIP does not support any telephony features.
Voken	virtual token	an advertisement that appears over the contents of a browser window, but not in a window of its own.
VOM	Volt-Ohm-Milliammeter	An electronic measuring device to measure voltage, amperage, resistance, electron direction flow and continuity.
VOP	Velocity of Propagation	the speed of a signal in relation to the speed of light in a vacuum (186,400 miles per second)
vortal	Vertical portal	A portal that caters to consumers within a particular industry (sometimes called a "vertical industry"). Vertical portals, also called "vortals," use Internet technology to offer the same kind of personalization tools that portals do. Another kind of vortal caters solely to other businesses rather than to an industry's consumers.
VOX	Voice Operated eXchange	telephone or radio activated device, such as a voice recorder or transmitter.
voxel	Volume pixel, or volume picture element	A three-dimensional pixel; a concept used in three-dimensional modeling. The smallest division of a three-dimensional space or image.
VoxML	Voice Markup Language	a technology from Motorola for creating a voice dialog with a Web site in which a user can call a Web site by phone and interact with it through speech recognition and Web site responses.
VPA	valid printable area Volume Procurement Amendment	The intersection of the current logical page or current overlay with the physical page in which printing is allowed. An agreement between a computer vendor and a customer under which the vendor grants discounted prices in return for the customer's commitment to purchase a minimum quantity of products.
VPD	Vital Product Data	Information about a device that is stored on the device itself. Typical VPD information includes a product model number, a unique serial number, product release level, maintenance level, and other information specific to the device type
VPDN	Virtual Private Dial-up Network	A network that extends remote access to a private network using a shared infrastructure.
VPI	Virtual Path Indentifier	A value in the cell header that identifies the virtual path (VP) to which the cell belongs. The field is 8 bits in cells traversing an UNI circuit and 12 bits in cells traversing network circuits
VPLS	virtual private LAN service	VPLS is a class of VPN that supports the connection of multiple sites in a single bridged domain over a managed IP/MPLS network.
VPN	Virtual Private Network	This is a network term that most computer users don't need to know, but at least you can impress your friends by talking about it. A VPN refers to a network that is connected to the Internet, but uses encryption to scramble all the data sent through the Internet so the entire network is "virtually" private.
VPS	Vectors Per Second Virtual private server	A measurement of the speed of a vector processor (a processor which can execute instructions in which the operands can be arrays of data rather than only single elements). a single physical server that is split into multiple virtual servers. What this means is that the single physical server is portioned in such a way that the one server appears to be multiple servers.
VQF	Vector Quantization Format	An audio codec similar to MP3 but less lossy and (arguably) more intelligent. See http://www.vqf.com
VR	Virtual reality	The use of multimedia to create a simulation of a product or service so that a user can experience and interact with it (e.g. driving a car).
VRC	Vertical Redundancy Check	A way of error checking by attaching a parity bit to each byte of data to be transmitted, which is then tested to determine if the transmission is correct. See parity bit and Cyclic Redundancy Check.
VRF	VPN routing/forwarding instance	A VRF consists of an IP routing table, a derived forwarding table, a set of interfaces that use the forwarding table, and a set of rules and routing protocols that determine what goes into the forwarding table. In general, a VRF includes the routing information that defines a customer VPN site that is attached to a PE router.
VRM	voltage regulator module	a tiny module that installs on a motherboard to control and regulate the voltage fed to the microprocessor.
VRML	Virtual Reality Modeling Language	It's a form of application that gives a 3-D effect to pictures sometimes allowing you to "move" through them.
VRRP	Virtual Router Redundancy Protocol	Election protocol that dynamically assigns responsibility for a virtual router to one of the VRRP routers on a LAN
VRS	Virtual Reference Station	Represents a network correction method in which multiple base stations are used to derive correction data specific to an individual rover but it is unique in that a “virtual” base station is created for the rover at the autonomous point of initiation.
VRT	Variable-Rate Technology	An electronic control system that changes or adjusts the rates of a chemical or material dispensed.
VRU	voice response unit	Device that accepts a coded request for data, composes a coded response and interprets the coded response into locations of stored vocabulary as output.
VSAM	Virtual Sequential Access Method Virtual Storage Access Method	A data storage system used in IBM mainframes. VSAM was designed to improve access time by searching indexes instead of actual files, and organizing data efficiently. An IBM program that controls communication and data flow in SNA networks.
VSAT	very small aperture terminal	A satellite-based networking service that has a low per site cost ($175 per month per site or less). VSATs achieved their low cost by using shared, high-power satellite capacity, asymmetric data flows and a star topology.
VSB	very severe burst Vestigial sideband	Interval between 2.5 and 10 seconds in which the background error rate (BER) exceeds 10-2; can alternatively be defined as three to ten consecutive severely errored seconds (SES). a type of amplitude modulation technique that encodes data by varying the amplitude of a single carrier frequency. Portions of one of the redundant sidebands are removed to form a vestigial sideband signal.
VSD	ViSio Diagram	Microsoft ViSio Filename extension
VSE	Virtual Storage Extended	a multitasking, 370-architected operating system akin to Multiple Virtual Storage (MVS). VSE work runs in partitions rather than address spaces, and uses POWER for input/output rather than JES, but is largely similar to MVS.
VSELP	Vector Sum Excited Linear Predictive	a type of speech coding using an excitation signal generated from three components: the output of a long-term, pitch filter and two codebooks.
VSIP	Visual Studio Industry Partners	the Microsoft program was created to educate and support ISVs, SIs, academic institutions, corporations and developers interested in integrating tools, components, and languages into the Visual Studio IDE.
VSM	Value Stream Mapping	transcript Lean tools and practices
VSN	volume serial number	an identifying number assigned to a disk or tape by Windows or other operating systems. Volume serial numbers ensure that the computer will know when the disk or tape in a drive is changed.
VSNL	Videsh Sanchar Nigam Limited	now Tata Communications Limited, India's largest telecommunication company in international long distance, enterprise data and internet services.
VSP	VoIP Service Provider	CSP supplying peer-to-peer application that enables customer to make voice calls over IP networks. See VoIP.
VSR	Vertical Scan Rate	The maximum number of frames per second that a computer monitor can display, expressed in hertz. Too low a scan rate causes a flickering screen which is hard on the eyes.
VSS	vector symbol set Volume Shadow Copy	In the GDDM function, a set of characters each of which is treated as a small picture and is described by a sequence of lines and arcs. creating online, consistent point-in-time copies of a single or multiple volumes in Windows Server environments
VSwitch	Virtual Switch	networking entities connecting Virtual Machines in a virtual network at layer 2.
VSWR	Voltage Standing Wave Ratio	The ratio of the transferring signal voltage as compared to reflected signal voltage measured along the length of a transmission line
VT-x/i or d or c	Virtualization Technology-x Virtualization Technology-Itanium for Directed I/O for Connectivity	x refers to all the hardware assists for virtualization in Intel. 64 and IA32 processorsIntel VT-x/i reduces the size and complexity of the VMM software improving its efficiency and enabling greater functionality. VT-d is a hardware enhancement for I/O virtualization that is implemented as part of core logic chipset. VT-c is a collection of I/O virtualization technologies that enables lower CPU utilization, reduced system latency, and improved networking and I/O throughput
VTAM	Virtual Table Access Method Virtual Telecommunications Access Method	IBM operating system module The main SNA subsystem resident in an IBM mainframe that manages session establishment and data flow between terminals and application programs, or between application programs.
VTL	virtual tape library	VTL is an archival backup solution that combines traditional tape backup methodology with low-cost disk technology to create an optimized backup and recovery solution.
VTOC	Volume Table of Contents	A table of contents on a disk or diskette that describes the location and size of each file. VTOC is generally a term used with mainframes; personal computers use the term File Allocation Table.
VTP	Vlan Trunking Protocol	Layer 2 messaging protocol that mantains VLAN configuration consistency by managing the addition, deletion, and renaming of VLANs on a network-wide basis
VTS	virtual tape subsystem	Tape library hardware and software extensions that utilize DASD buffers to multiply the tape device count, throughput and storage density of tape library systems.
VTY	Virtual teleTYpewriter	Virtual terminal for remote console access.
VUE	Visual User Environment	A graphical user interface for UNIX from Hewlett-Packard.
VVM	Veritas Volume Manager	Easy-to-use, online storage management tool for enterprise environments, which reduces planned and unplanned downtime.
VVR	Veritas Volume Replicator	Provides the foundation for seamless availability across sites. Based on VERITAS Volume Manager, it reliably, efficiently, and consistently replicates data to remote locations over any IP network when data loss and prolonged downtime cannot be tolerated
VWE	virtual work environment	virtual work environment
VWIC	Voice/Wan Interface Card	Voice/Wan Interface Card of Cisco Router
VWS	Virtual Web Server	A VWS allows you to use your domain on an ISP's web server. Your URL will give the impression that you have your own dedicated web server.
VxD / VDD	Virtual Device Driver	A virtual device driver is the component of a device driver that communicates directly between an application and a hardware device. It runs as part of the OS kernel and has access to kernel memory, running processes and hardware.
	vendor-neutral	A state in which no one vendor can control the definition, revision or distribution of a specification.
	Video Search	The ability to search within a collection of videos, whether inside the enterprise or outside, whether under enterprise control or in another company's domain, is attracting interest in areas of content management as expectations sparked by YouTube, Hulu, Netflix, Vimeo and Blinkx enter the enterprise environment.
	Video telepresence	a form of immersive video communication that creates the impression of being in the same room as other conference participants. Most telepresence suites run high-definition (HD) video resolution at 720p or 1,080p lines.
	Virus	A chunk of computer programming code that makes copies of itself without any concious human intervention.
	Vista	formerly code named Longhorn, is the name of the next Microsoft Windows desktop operating system release to follow Windows XP.
	voice grade	The term applied to channels used primarily for speech transmission, generally with a frequency range of about 300 to 3,000 cycles per second (hertz.) Voice Grade channels may be used to send analog or digital data or facsimile.
	voiceband	A voice grade bandwidth typically spanning between 300 and 3300 Hz.
	Vtunnel	Web proxy supporting SSL via the HTTPS encryption protocol. ,a href="http://www.vtunnel.com/">http://www.vtunnel.com/