O - Definitions

  • O

    OA&M (operations, administration, and management)

    OA&M (operations, administration, and management) is a general term used to describe the costs, tasks involved, or other aspects of operating, administering, and managing something such as a computer network.

  • OC-768

    OC-768 is currently the fastest synchronous optical network (SONET) standard rate for data transmission on optical fiber as part of the broadband ISDN (BISDN).

  • offline

    Offline is the condition of being capable of but currently not connected to a network of computers or other devices.

  • one-armed router

    A one-armed router is a router that routes traffic between virtual local area networks (VLANs).

  • online

    Online is the condition of being connected to a network of computers or other devices.

  • open relay (insecure relay or a third-party relay)

    An open relay (sometimes called an insecure relay or a third-party relay) is an SMTP e-mail server that allows third-party relay of e-mail messages.

  • OpenNMS (Open Network Management System)

    OpenNMS (Open Network Management System) is the first enterprise-grade network management platform developed under the open source model.

  • Optical Carrier levels (OCx)

    The Synchronous Optical Network (SONET) includes a set of signal rate multiples for transmitting digital signals on optical fiber.

  • optical line terminal (OLT)

    An optical line terminal (OLT) is a device that is located at the service provider's central office and is the endpoint of a passive optical network (PON).

  • optical network (photonic network)

    An optical (photonic) network is a communications network in which information is transmitted as optical or infrared radiation transmission (IR) signals. Optical transmission has several other advantages over electrical transmission, including shorter data-transmission delay times.

  • optoelectronics

    Optoelectronics is a branch of electronics that overlaps with physics.

  • optoisolator (optical coupler or optocoupler)

    An optoisolator (also optical coupler or optocoupler) is a component that uses light to transfer electrical signals between circuits to keep them electrically isolated from each other, preventing surges.

  • orthogonal frequency-division multiplexing (OFDM)

    Orthogonal frequency-division multiplexing (OFDM) is a digital modulation method that splits a signal into several narrowband channels carried on different frequencies to reduce interference.

  • OSGi (Open Service Gateway Initiative)

    OSGi (Open Service Gateway Initiative) is Java framework for developing and deploying modular software programs and libraries.

  • OSI reference model (Open Systems Interconnection)

    Definition: Learn what the Open Systems Interconnection (OSI) reference model is and how its seven layers of functions provide vendors and developers with a common language for discussing how messages should be transmitted between any two points in a telecommunication network.

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