O
* OBM: On-Board Modem
* OCR: Optical Character Recognition
* ODI: Open Data-link Interface
* OLED: Organic Light-Emitting Diode
* Omnifont Recognition
* OMR: Optical Mark Recognition
* OOTB: Out-Of-The-Box
* OpenHCI
* Operating System
* Opteron
* Optical Disk
* Optical Resolution
* Optical Scanner
* Oscillator Clock
* Oscilloscope
* OTDR: Optical Time Domain Reflectometer
* OUI : Organizational Unique Identifier
* Output Device
* Overclock
OBM: On-board modem
On-board modem (OBM), also known as Internal modem, is installed on an expansion board inside a computer chase. In contrast, an external modem is a box that attaches to a computer's COM port via cables.
OCR: Optical character recognition
Optical Character Recognition (OCR) refers to the technology that involves reading text from paper and translating the images into a form that the computer can manipulate (for example, into ASCII codes). An OCR system enables you to take a book or a magazine article, and feed it directly into an electronic computer file.
ODI: Open Data-link Interface
Open Data-link Interface (ODI) is an application programming interface (API) developed by Apple and Novell for writing network drivers. Like NDIS, ODI provides rules that establish a vendor-neutral interface between the protocol stack and the adapter driver. It resides in Layer 2, the Data Link layer, of the OSI model. This interface also enables one or more network drivers to support one or more protocol stacks. For example, ODI allows a computer with just one NIC to be simultaneously connected to both an IPX/SPX network and a TCP/IP network.
OLED: Organic light-emitting diode
Organic light-emitting diode (OLED), a display technology, is a thin-film light-emitting diode (LED) in which the emissive layer is an organic compound. When the emissive layer is polymeric, varying amounts of OLEDs can be deposited in arrays on a screen using simple "printing" methods to create a graphical colour display, for use as television screens, computer displays, portable system screens, and in advertising and information board applications. OLED may also be used in lighting devices. OLEDs are available as distributed sources while the inorganic LEDs are point sources of light. Prior to standardization, OLED technology was also referred to as OEL or Organic Electro-Luminescence.
OMR: Optical Mark Recognition
Optical Mark Recognition (OMR) is the technology of electronically extracting intended data from marked fields, such as checkboxes and fill-in fields, on printed forms. It is generally distinguished from OCR by the fact that a recognition engine is not required. This requires the image to have high contrast and an easily-recognizable or irrelevant shape. OMR technology scans a printed form and reads predefined positions and records where marks are made on the form. This technology is useful for applications in which large numbers of hand-filled forms need to be processed quickly and with great accuracy, such as surveys, reply cards, questionnaires and ballots.
OpenHCI
Open Host Controller Interface (OpenHCI) Specification for the Universal Serial Bus (USB) is a register-level description of a Host Controller for the Universal Serial Bus (USB) which in turn is described by the Universal Serial Bus Specification. The purpose of OpenHCI is to accelerate the acceptance of USB in the marketplace by promoting the use of a common industry software/hardware interface. OpenHCI allows multiple Host Controller vendors to design and sell Host Controllers with a common software interface, freeing them from the burden of writing and distributing software drivers. The design goal has been to balance the complexity of the hardware and software so that OpenHCI is more than the simplest possible Host Controller for USB yet not the most complex possible.
operating system
Operating System (OS) is a software program that manages the hardware and software resources of a computer. The OS performs basic tasks, such as controlling and allocating memory, prioritizing the processing of instructions, controlling input and output devices, facilitating networking, and managing files. The OS may be split into a kernel which is always present and various system programs which use facilities provided by the kernel to perform higher-level house-keeping tasks, often acting as servers in a client-server relationship. Additionally, it provides a foundation upon which to run application software such as word processing programs and web browsers.
Opteron
Opteron is the AMD's server-oriented 64-bit chip, first released in 2003. The AMD Opteron is the first eighth-generation x86 processor (K8 core), and the first of AMD's AMD64 (x86-64) processors. It is intended to compete in the server market, particularly in the same segment as the Intel Xeon processor. The AMD Opteron processor is designed to run existing 32-bit applications and offer customers a migration path to 64-bit computing. The AMD Opteron™ processor is offered in three series: the 100 series (1-way), the 200 series (Up to 2-way), and the 800 series (Up to 8-way).
optical disk
Optical disk is a storage medium from which data is read and to which it is written by laser beams. CD, CD-ROM, DVD-ROM and DVD-Video are read-only optical disks that are recorded at the time of manufacture and cannot be erased. CD-R, DVD-R, WORM and magneto-optic (in WORM mode) disks are write-once. They are recorded in the user's environment, but cannot be erased. CR-RW, DVD-RAM, DVD-RW and MO disks are rewritable.
optical resolution
Optical resolution, often used in reference to optical scanners and digital cameras, is the physical resolution at which a device can capture an image. For example, if we say a scanner offers an optical resolution of 300 dpi, which means that the scanner can actually capture 300x300 (90,000) pixels per square inch.
optical scanner
Optic scanner is a hardware device that can read text or illustrations printed on paper and translate the information into a form the computer can use. A scanner works by digitizing an image. The resulting matrix of bits, called a bit map, can then be stored in a file, displayed on a screen, and manipulated by programs. There are color scanners and gray scaling scanners which the same principle applies. A scanner is commonly connected to a computer USB, Firewire, Parallel or SCSI port.
oscillator clock
Oscillator clock is circuit within a computer that creates a series of pulses that keeps track of the date and time. In addition, the oscillator clock synchronizes, paces and coordinates the operations of the computer's circuit.
oscilloscope
An oscilloscope or scope is an electronic measuring instrument that creates a visible two-dimensional graph of one or more electrical potential differences. The horizontal axis of the display normally represents time, making the instrument useful for displaying periodic signals. The vertical axis usually shows voltage. The display is caused by a "spot" that periodically "sweeps" the screen from left to right.
OTDR: Optical Time Domain Reflectometer
Optical Time Domain Reflectometer (OTDR) is an instrument that analyzes the light loss in an optical fiber. An OTDR trace shows fiber attenuation for the system and location and magnitude of any losses from splices, connectors, and fiber anomalies or fiber discontinuities. An OTDR injects a short, intense laser pulse into the optical fiber and measures the backscatter and reflection of light as a function of time. The reflected light characteristics are analyzed to determine the location of any fiber optic breaks or splice losses.
OUI : Organizational Unique Identifier
Organizational Unique Identifier (OUI) is the first 24 bits of a MAC address for a network device, which indicates the specific vendor for that device as assigned by the IEEE.
output device
Output device is the type of devices that are designed to accept data from the computer. Output devices include video monitors, printers, and disk drives.
Overclock
Overclock in computing means to run a microprocessor faster than the speed for which it has been tested and approved. Overclocking is a popular technique to get a little more performance from a system by setting a jumper on the motherboard. Overclocking does come with some risks, however, such as over-heating, so you should become familiar with all the pros and cons before you attempt it. Multiplier clock is often used by manufacurers to restrict the overclocking by users.