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USB

Index USB

USB (abbreviation of Universal Serial Bus), is an industry standard that was developed to define cables, connectors and protocols for connection, communication, and power supply between personal computers and their peripheral devices. [1]

152 relations: ActiveSync, Ajay Bhatt, American wire gauge, Android (operating system), Apple Desktop Bus, Apple Inc., Backward compatibility, Battery charger, Bluetooth, Bus (computing), CD-RW, Characteristic impedance, Closed-circuit television, Communication endpoint, Communication protocol, Compaq, Compound device, Computer keyboard, Computer mouse, Data signaling rate, Data-rate units, Device driver, Differential signaling, Digital camera, Digital Equipment Corporation, Digital rights management, Direct current, Direct memory access, Direct Stream Digital, Disk storage, DMA attack, DockPort, Duplex (telecommunications), DVD, Electric power, Electrical termination, Electronic circuit, Engineering change order, ESATAp, Ethernet, ExpressCard, Extensible Host Controller Interface, Firmware, Game port, Ground loop (electricity), Hard disk drive, Hewlett-Packard, Hexadecimal, High fidelity, Hot swapping, ..., IBM, IEEE 1394, IMac, Image scanner, Infrared Data Association, Inkjet printing, Integrated circuit, Intel, InterChip USB, International Electrotechnical Commission, Interrupt, IOS, Joystick, Laser printing, Legacy port, Legacy-free PC, Line code, Linux, LIO (SCSI target), List of IEC technical committees, Loudspeaker, Lucent, MacOS, MagSafe, Media Transfer Protocol, Megabit, Memory card, Microcontroller, Microphone, Microsoft, Microsoft Windows, MIDI, Mini DisplayPort, Mobile High-Definition Link, Modem, MP3 player, NEC, Network interface controller, Network packet, Nortel, Numerical control, Ohm, Parallel port, PCI Express, Peripheral, Personal computer, Philips, Physical layer, Polling (computer science), Portable media player, Power over Ethernet, PoweredUSB, Printed circuit board, Printer (computing), Programmable read-only memory, Protocol converter, PS/2 port, Renesas Electronics, RNDIS, Round-robin scheduling, RS-232, Sample-rate conversion, Secure Digital, Serial ATA, Serial communication, Serial port, Smart card, Sound card, ST-Ericsson, Star network, Technical standard, Texas Instruments, The Oregonian, Thunderbolt (interface), Tree network, Tuple, Twisted pair, Ultra-wideband, USB 3.0, USB adapter, USB communications device class, USB flash drive, USB hub, USB human interface device class, USB Implementers Forum, USB mass storage device class, USB On-The-Go, USB video device class, USB-C, Video camera, Voice over IP, Volt, Webcam, Wi-Fi, Windows Easy Transfer, Wireless, Wireless access point, Wireless network, Wireless USB, Ziff Davis, Zip (file format), 64b/66b encoding. Expand index (102 more) »

ActiveSync

ActiveSync is a mobile data synchronization app developed by Microsoft, originally released in 1996.

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Ajay Bhatt

Ajay V. Bhatt is an Indian-American computer architect who helped define and develop several widely used technologies, including USB (Universal Serial Bus), AGP (Accelerated Graphics Port), PCI Express, Platform Power management architecture and various chipset improvements.

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American wire gauge

American wire gauge (AWG), also known as the Brown & Sharpe wire gauge, is a logarithmic stepped standardized wire gauge system used since 1857 predominantly in North America for the diameters of round, solid, nonferrous, electrically conducting wire.

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Android (operating system)

Android is a mobile operating system developed by Google, based on a modified version of the Linux kernel and other open source software and designed primarily for touchscreen mobile devices such as smartphones and tablets.

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Apple Desktop Bus

Apple Desktop Bus (ADB) is a proprietary bit-serial peripheral bus connecting low-speed devices to computers.

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Apple Inc.

Apple Inc. is an American multinational technology company headquartered in Cupertino, California, that designs, develops, and sells consumer electronics, computer software, and online services.

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Backward compatibility

Backward compatibility is a property of a system, product, or technology that allows for interoperability with an older legacy system, or with input designed for such a system, especially in telecommunications and computing.

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Battery charger

A battery charger, or recharger, is a device used to put energy into a secondary cell or rechargeable battery by forcing an electric current through it.

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Bluetooth

Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485GHz) from fixed and mobile devices, and building personal area networks (PANs).

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Bus (computing)

In computer architecture, a bus (a contraction of the Latin omnibus) is a communication system that transfers data between components inside a computer, or between computers.

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CD-RW

CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format.

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Characteristic impedance

The characteristic impedance or surge impedance (usually written Z0) of a uniform transmission line is the ratio of the amplitudes of voltage and current of a single wave propagating along the line; that is, a wave travelling in one direction in the absence of reflections in the other direction.

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Closed-circuit television

Closed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors.

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Communication endpoint

A communication endpoint is a type of communication network node.

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Communication protocol

In telecommunication, a communication protocol is a system of rules that allow two or more entities of a communications system to transmit information via any kind of variation of a physical quantity.

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Compaq

Compaq (a portmanteau of Compatibility And Quality; occasionally referred to as CQ prior to its final logo) was a company founded in 1982 that developed, sold, and supported computers and related products and services.

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Compound device

A compound device is like an "internal" USB hub (often implemented in software on the device), which allows various sub-devices to connect.

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Computer keyboard

In computing, a computer keyboard is a typewriter-style device which uses an arrangement of buttons or keys to act as mechanical levers or electronic switches.

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Computer mouse

A computer mouse is a hand-held pointing device that detects two-dimensional motion relative to a surface.

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Data signaling rate

In telecommunication, data signaling rate (DSR), also known as gross bit rate, is the aggregate rate at which data pass a point in the transmission path of a data transmission system.

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Data-rate units

In telecommunications, data-transfer rate is the average number of bits (bitrate), characters or symbols (baudrate), or data blocks per unit time passing through a communication link in a data-transmission system.

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Device driver

In computing, a device driver is a computer program that operates or controls a particular type of device that is attached to a computer.

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Differential signaling

Differential signaling is a method for electrically transmitting information using two complementary signals.

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Digital camera

A digital camera or digicam is a camera that captures photographs in digital memory.

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Digital Equipment Corporation

Digital Equipment Corporation, also known as DEC and using the trademark Digital, was a major American company in the computer industry from the 1950s to the 1990s.

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Digital rights management

Digital rights management (DRM) is a set of access control technologies for restricting the use of proprietary hardware and copyrighted works.

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Direct current

Direct current (DC) is the unidirectional flow of electric charge.

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Direct memory access

Direct memory access (DMA) is a feature of computer systems that allows certain hardware subsystems to access main system memory (Random-access memory), independent of the central processing unit (CPU).

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Direct Stream Digital

DSD Records (DSD) is a trademark used by Sony and Philips for their system of digitally recreating audible signals for the Super Audio CD (SACD).

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Disk storage

Disk storage (also sometimes called drive storage) is a general category of storage mechanisms where data is recorded by various electronic, magnetic, optical, or mechanical changes to a surface layer of one or more rotating disks.

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DMA attack

A DMA attack is a type of side channel attack in computer security, in which an attacker can penetrate a computer or other device, by exploiting the presence of high-speed expansion ports that permit direct memory access ("DMA").

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DockPort

DockPort (originally codenamed Lightning Bolt) is a backward compatible extension of DisplayPort, adding USB 3.0 and DC power, in addition to DisplayPort's video and audio signalling.

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Duplex (telecommunications)

A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions.

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DVD

DVD (an abbreviation of "digital video disc" or "digital versatile disc") is a digital optical disc storage format invented and developed by Philips and Sony in 1995.

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Electric power

Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit.

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Electrical termination

In electronics, electrical termination is the practice of ending a transmission line with a device that matches the characteristic impedance of the line.

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Electronic circuit

An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow.

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Engineering change order

Engineering change orders (ECO) are used for changes in components, assemblies, or documents such as processes and work instructions.

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ESATAp

In computing, eSATAp (also known as Power over eSATA, Power eSATA, eSATA/USB Combo, eSATA USB Hybrid Port/EUHP) is a combination connection for external storage devices.

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Ethernet

Ethernet is a family of computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN).

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ExpressCard

ExpressCard, initially called NEWCARD, is an interface to connect peripheral devices to a computer, usually a laptop computer.

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Extensible Host Controller Interface

eXtensible Host Controller Interface (xHCI) is a computer interface specification that defines a register-level description of a host controller for Universal Serial Bus (USB), which is capable of interfacing with USB 1.x, 2.0, and 3.x compatible devices.

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Firmware

In electronic systems and computing, firmware is a specific class of computer software that provides the low-level control for the device's specific hardware.

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Game port

The game port, originally introduced on the Game Control Adapter, is a device port that was found on IBM PC compatible and other computer systems throughout the 1980s and 1990s.

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Ground loop (electricity)

In an electrical system, a ground loop or earth loop occurs when two points of a circuit both intended to be at ground reference potential have a potential between them.

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Hard disk drive

A hard disk drive (HDD), hard disk, hard drive or fixed disk is an electromechanical data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating disks (platters) coated with magnetic material.

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Hewlett-Packard

The Hewlett-Packard Company (commonly referred to as HP) or shortened to Hewlett-Packard was an American multinational information technology company headquartered in Palo Alto, California.

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Hexadecimal

In mathematics and computing, hexadecimal (also base, or hex) is a positional numeral system with a radix, or base, of 16.

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High fidelity

High fidelity (often shortened to hi-fi or hifi) is a term used by listeners, audiophiles and home audio enthusiasts to refer to high-quality reproduction of sound.

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Hot swapping

Hot swapping (frequently inaccurately called hot plugging) is replacing or adding components without stopping or shutting down the system.

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IBM

The International Business Machines Corporation (IBM) is an American multinational technology company headquartered in Armonk, New York, United States, with operations in over 170 countries.

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IEEE 1394

IEEE 1394 is an interface standard for a serial bus for high-speed communications and isochronous real-time data transfer.

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IMac

iMac is a family of all-in-one Macintosh desktop computers designed and built by Apple Inc. It has been the primary part of Apple's consumer desktop offerings since its debut in August 1998, and has evolved through seven distinct forms.

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Image scanner

An image scanner—often abbreviated to just scanner, although the term is ambiguous out of context (barcode scanner, CT scanner etc.)—is a device that optically scans images, printed text, handwriting or an object and converts it to a digital image.

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Infrared Data Association

The Infrared Data Association (IrDA) is an industry-driven interest group that was founded in 1993 by around 50 companies.

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Inkjet printing

Inkjet printing is a type of computer printing that recreates a digital image by propelling droplets of ink onto paper, plastic, or other substrates.

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Integrated circuit

An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, normally silicon.

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Intel

Intel Corporation (stylized as intel) is an American multinational corporation and technology company headquartered in Santa Clara, California, in the Silicon Valley.

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InterChip USB

InterChip USB (IC-USB or sometimes referred to as USB-IC, Inter-chip USB, or High-Speed Inter-Chip (HSIC)) is an addendum to the USB Implementer Forum's USB 2.0 specification.

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International Electrotechnical Commission

The International Electrotechnical Commission (IEC; in French: Commission électrotechnique internationale) is an international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies – collectively known as "electrotechnology".

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Interrupt

In system programming, an interrupt is a signal to the processor emitted by hardware or software indicating an event that needs immediate attention.

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IOS

iOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. exclusively for its hardware.

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Joystick

A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling.

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Laser printing

Laser printing is an electrostatic digital printing process.

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Legacy port

A legacy port is a computer port or connector that is considered by some to be fully or partially superseded.

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Legacy-free PC

A legacy-free PC is a type of personal computer that lacks a floppy drive, legacy ports, and an Industry Standard Architecture (ISA) bus (or sometimes, any internal expansion bus at all).

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Line code

Some signals are more prone to error than others when conveyed over a communication channel as the physics of the communication or storage medium constrains the repertoire of signals that can be used reliably.

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Linux

Linux is a family of free and open-source software operating systems built around the Linux kernel.

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LIO (SCSI target)

In computing, Linux-IO (LIO) Target is an open-source implementation of the SCSI target that has become the standard one included in the Linux kernel.

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List of IEC technical committees

IEC or is a standards-making body in the field of electrical and electronics technologies.

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Loudspeaker

A loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer; which converts an electrical audio signal into a corresponding sound.

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Lucent

Lucent Technologies, Inc., was an American multinational telecommunications equipment company headquartered in Murray Hill, New Jersey, in the United States.

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MacOS

macOS (previously and later) is a series of graphical operating systems developed and marketed by Apple Inc. since 2001.

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MagSafe

MagSafe is a series of proprietary magnetically attached power connectors, originally introduced by Apple Inc. on January 10, 2006, in conjunction with the MacBook Pro at the Macworld Expo in San Francisco, California.

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Media Transfer Protocol

The Media Transfer Protocol (MTP) is an extension to the Picture Transfer Protocol (PTP) communications protocol that allows media files to be transferred atomically to and from portable devices.

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Megabit

The megabit is a multiple of the unit bit for digital information.

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Memory card

A memory card, flash card or memory cartridge is an electronic flash memory data storage device used for storing digital information.

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Microcontroller

A microcontroller (MCU for microcontroller unit, or UC for μ-controller) is a small computer on a single integrated circuit.

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Microphone

A microphone, colloquially nicknamed mic or mike, is a transducer that converts sound into an electrical signal.

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Microsoft

Microsoft Corporation (abbreviated as MS) is an American multinational technology company with headquarters in Redmond, Washington.

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Microsoft Windows

Microsoft Windows is a group of several graphical operating system families, all of which are developed, marketed, and sold by Microsoft.

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MIDI

MIDI (short for Musical Instrument Digital Interface) is a technical standard that describes a communications protocol, digital interface, and electrical connectors that connect a wide variety of electronic musical instruments, computers, and related music and audio devices.

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Mini DisplayPort

The Mini DisplayPort (MiniDP or mDP) is a miniaturized version of the DisplayPort audio-visual digital interface.

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Mobile High-Definition Link

Mobile High-Definition Link (MHL) is an industry standard for a mobile audio/video interface that allows the connection of smartphones, tablets, and other portable consumer electronics devices to high-definition televisions (HDTVs), audio receivers, and projectors.

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Modem

A modem (modulator–demodulator) is a network hardware device that modulates one or more carrier wave signals to encode digital information for transmission and demodulates signals to decode the transmitted information.

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MP3 player

An MP3 player or Digital Audio Player is an electronic device that can play digital audio files.

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NEC

is a Japanese multinational provider of information technology (IT) services and products, headquartered in Minato, Tokyo, Japan.

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Network interface controller

A network interface controller (NIC, also known as a network interface card, network adapter, LAN adapter or physical network interface, and by similar terms) is a computer hardware component that connects a computer to a computer network.

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Network packet

A network packet is a formatted unit of data carried by a packet-switched network.

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Nortel

Nortel Networks Corporation, formerly known as Northern Telecom Limited, Northern Electric and sometimes known simply as Nortel, was a multinational telecommunications and data networking equipment manufacturer headquartered in Mississauga, Ontario, Canada.

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Numerical control

Computer numerical control (CNC) is the automation of machine tools by means of computers executing pre-programmed sequences of machine control commands.

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Ohm

The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm.

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Parallel port

A parallel port is a type of interface found on computers (personal and otherwise) for connecting peripherals.

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PCI Express

PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe or PCI-e, is a high-speed serial computer expansion bus standard, designed to replace the older PCI, PCI-X, and AGP bus standards.

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Peripheral

A peripheral device is "an ancillary device used to put information into and get information out of the computer." Three categories of peripheral devices exist based on their relationship with the computer.

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Personal computer

A personal computer (PC) is a multi-purpose computer whose size, capabilities, and price make it feasible for individual use.

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Philips

Koninklijke Philips N.V. (Philips, stylized as PHILIPS) is a Dutch multinational technology company headquartered in Amsterdam currently focused in the area of healthcare.

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Physical layer

In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer.

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Polling (computer science)

Polling, or polled operation, in computer science, refers to actively sampling the status of an external device by a client program as a synchronous activity.

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Portable media player

A portable media player (PMP) or digital audio player (DAP) is a portable consumer electronics device capable of storing and playing digital media such as audio, images, and video files.

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Power over Ethernet

Power over Ethernet or PoE describes any of several standard or ad-hoc systems which pass electric power along with data on twisted pair Ethernet cabling.

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PoweredUSB

PoweredUSB, also known as Retail USB, USB PlusPower, and USB +Power, is an addition to the Universal Serial Bus standard that allows for higher-power devices to obtain power through their USB host instead of requiring an independent power supply or external AC adapter.

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Printed circuit board

A printed circuit board (PCB) mechanically supports and electrically connects electronic components or electrical components using conductive tracks, pads and other features etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate.

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Printer (computing)

In computing, a printer is a peripheral device which makes a persistent human-readable representation of graphics or text on paper.

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Programmable read-only memory

A programmable read-only memory (PROM) or field programmable read-only memory (FPROM) or one-time programmable non-volatile memory (OTP NVM) is a form of digital memory where the setting of each bit is locked by a fuse or antifuse.

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Protocol converter

A Protocol Converter is a device used to convert standard or proprietary protocol of one device to the protocol suitable for the other device or tools to achieve the interoperability.

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PS/2 port

The PS/2 port is a 6-pin mini-DIN connector used for connecting keyboards and mice to a PC compatible computer system.

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Renesas Electronics

is a Japanese semiconductor manufacturer headquartered in Tokyo.

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RNDIS

The Remote Network Driver Interface Specification (RNDIS) is a Microsoft proprietary protocol used mostly on top of USB.

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Round-robin scheduling

Round-robin (RR) is one of the algorithms employed by process and network schedulers in computing.

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RS-232

In telecommunications, RS-232, Recommended Standard 232 is a standard introduced in 1960 for serial communication transmission of data.

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Sample-rate conversion

Sample-rate conversion is the process of changing the sampling rate of a discrete signal to obtain a new discrete representation of the underlying continuous signal.

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Secure Digital

Secure Digital (SD) is a non-volatile memory card format developed by the SD Card Association (SDA) for use in portable devices.

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Serial ATA

Serial ATA (SATA, abbreviated from Serial AT Attachment) is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drives, optical drives, and solid-state drives.

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Serial communication

In telecommunication and data transmission, serial communication is the process of sending data one bit at a time, sequentially, over a communication channel or computer bus.

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Serial port

In computing, a serial port is a serial communication interface through which information transfers in or out one bit at a time (in contrast to a parallel port).

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Smart card

A smart card, chip card, or integrated circuit card (ICC), is any pocket-sized card that has embedded integrated circuits.

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Sound card

A sound card (also known as an audio card) is an internal expansion card that provides input and output of audio signals to and from a computer under control of computer programs.

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ST-Ericsson

ST-Ericsson was a multinational manufacturer of wireless products and semiconductors, supplying to mobile device manufacturers.

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Star network

A Star network is one of the most common computer network topologies.

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Technical standard

A technical standard is an established norm or requirement in regard to technical systems.

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Texas Instruments

Texas Instruments Inc. (TI) is an American technology company that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally.

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The Oregonian

The Oregonian is a daily newspaper based in Portland, Oregon, owned by Advance Publications.

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Thunderbolt (interface)

Thunderbolt is the brand name of a hardware interface standard developed by Intel (in collaboration with Apple) that allows the connection of external peripherals to a computer.

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Tree network

A tree network, or star-bus network, is a hybrid network topology in which star networks are interconnected via bus networks.

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Tuple

In mathematics, a tuple is a finite ordered list (sequence) of elements.

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Twisted pair

Twisted pair cabling is a type of wiring in which two conductors of a single circuit are twisted together for the purposes of improving electromagnetic compatibility.

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Ultra-wideband

Ultra-wideband (also known as UWB, ultra-wide band and ultraband) is a radio technology that can use a very low energy level for short-range, high-bandwidth communications over a large portion of the radio spectrum.

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USB 3.0

USB 3.0 is the third major version of the Universal Serial Bus (USB) standard for interfacing computers and electronic devices.

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USB adapter

A USB adapter is a type of protocol converter which is used for converting USB data signals to and from other communications standards.

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USB communications device class

USB communications device class (or USB CDC class) is a composite Universal Serial Bus device class.

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USB flash drive

A USB flash drive, also variously known as a thumb drive, pen drive, gig stick, flash stick, jump drive, disk key, disk on key (after the original M-Systems DiskOnKey drive from 2000), flash-drive, memory stick (not to be confused with the Sony Memory Stick), USB stick or USB memory, is a data storage device that includes flash memory with an integrated USB interface.

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USB hub

A USB hub is a device that expands a single Universal Serial Bus (USB) port into several so that there are more ports available to connect devices to a host system, similar to a power strip.

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USB human interface device class

In computing, the USB human interface device class (USB HID class) is a part of the USB specification for computer peripherals: it specifies a device class (a type of computer hardware) for human interface devices such as keyboards, mice, game controllers and alphanumeric display devices.

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USB Implementers Forum

The USB Implementers Forum (USB-IF) is a not for profit organization created to promote and support the Universal Serial Bus.

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USB mass storage device class

The USB mass storage device class (also known as USB MSC or UMS) is a set of computing communications protocols defined by the USB Implementers Forum that makes a USB device accessible to a host computing device and enables file transfers between the host and the USB device.

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USB On-The-Go

USB On-The-Go, often abbreviated to USB OTG or just OTG, is a specification first used in late 2001 that allows USB devices, such as tablets or smartphones, to act as a host, allowing other USB devices, such as USB flash drives, digital cameras, mice or keyboards, to be attached to them.

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USB video device class

The USB video device class (also USB video class or UVC) is a USB device class that describes devices capable of streaming video like webcams, digital camcorders, transcoders, analog video converters and still-image cameras.

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USB-C

USB-C, formally known as USB Type-C, is a 24-pin USB connector system, which is distinguished by its two-fold rotational-symmetrical connector.

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Video camera

A video camera is a camera used for electronic motion picture acquisition (as opposed to a movie camera, which records images on film), initially developed for the television industry but now common in other applications as well.

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Voice over IP

Voice over Internet Protocol (also voice over IP, VoIP or IP telephony) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet.

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Volt

The volt (symbol: V) is the derived unit for electric potential, electric potential difference (voltage), and electromotive force.

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Webcam

A webcam is a video camera that feeds or streams its image in real time to or through a computer to a computer network.

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Wi-Fi

Wi-Fi or WiFi is technology for radio wireless local area networking of devices based on the IEEE 802.11 standards.

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Windows Easy Transfer

Windows Easy Transfer is a specialized file transfer program developed by Microsoft which allows users of the Windows operating system to transfer personal files and settings from a computer running an earlier version of Windows to a computer running a newer version.

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Wireless

Wireless communication, or sometimes simply wireless, is the transfer of information or power between two or more points that are not connected by an electrical conductor.

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Wireless access point

20018 In computer networking, a wireless access point (WAP), or more generally just access point (AP), is a networking hardware device that allows a Wi-Fi device to connect to a wired network.

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Wireless network

A wireless network is a computer network that uses wireless data connections between network nodes.

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Wireless USB

Wireless USB is a short-range, high-bandwidth wireless radio communication protocol created by the Wireless USB Promoter Group which intends to further increase the availability of general USB-based technologies.

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Ziff Davis

Ziff Davis, LLC is an American publisher and Internet company.

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Zip (file format)

ZIP is an archive file format that supports lossless data compression.

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64b/66b encoding

In data networking and transmission, 64b/66b is a line code that transforms 64-bit data to 66-bit line code to provide enough state changes to allow reasonable clock recovery and alignment of the data stream at the receiver.

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References

[1] https://en.wikipedia.org/wiki/USB

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