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List of netowrking, wireless, broadband, satellite, telephony, general computing and other technical terms used throughout the site.
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Term Description
OAN OAN (Optical Access Network) refers to an Access Network made up of optical transmission links. This is in contrast with older technologies, which typically use copper links composed of twisted-pair or coaxial cables.
OFDM OFDM (orthogonal frequency-division multiplexing) is a modulation technique used for high-speed 802.11a, 802.11g, 802.16 and WiMAX wireless communications.

It works by splitting radio signals into smaller narrowband channels, and transmitting simultaneously at different frequencies. In OFDM, priority is given to minimizing interference, or crosstalk.

See also: FDM (frequency-division multiplexing) and TDM (time-division multiplexing).
OFDMA Orthogonal Frequency-Division Multiple Access (OFDMA) is a method of encoding digital data on multiple frequencies. It is a digital modulation scheme, allowing a large number of sub-carrier signals to carry data on several parallel data streams or channels.

The technology works by splitting the radio signal into multiple smaller sub-signals that are then transmitted simultaneously at different frequencies. OFDM reduces the amount of crosstalk in signal transmissions. It also provides for assigning subsets of sub-carriers to different users, allowing for simultaneous low data rate transmission from several users on the same frequency band.

OFDMA is used by many cable and wireless technologies, such as, ADSL, MoCA home networking, Docsis 3.1, LTE and WiMAX.
OLT OLT (Optical Line Termination) provides the network-side interface of the Optical Access Network (OAN), and is connected to one or more Optical Network Units (ONUs).
ONT ONT (Optical Network Terminal) - device that terminates the fiber optic network at the customer premises.

Also called ONU (Optical Network Unit)
ONU ONU (Optical Network Unit) provides the user-side terminatioin and interface of the Optical Access Network (OAN). More than one ONU may be connected to the same Optical Line Termination (OLT) by means of passive or active intermediate elements.

Also called ONT (Optical Network Terminal)
OSI OSI (Open Systems Interconnection) defines a networking framework standardized by the International Organization for Standardization (ISO). Adherence to the standard enables any OSI-compliant system to communicate with any other OSI-compliant system for a meaningful exchange of information. The OSI model defines seven layers for implementing protocols:

1. Physical
2. Data Link
3. Network
4. Transport
5. Session
6. Presentation
7. Application
OTOH On The Other Hand
overclock overclock - to run a CPU, or/and other components, at a speed faster than their rated ability. Overclocking is a popular technique that helps you get a little more performance from a system. The risks involved are overheating, stability issues and shorter lifespan of the components involved. In other words, (especially since you're reading the definition) you should become more familiar with all the pros and cons before attempting it.
Term Description
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