Networks and storage Definitions

  • A

    access layer

    The access layer is where host computers and end users connect to the network.

  • alien crosstalk (AXT)

    Alien crosstalk (AXT) is electromagnetic noise that can occur in a cable that runs alongside one or more other signal-carrying cables.

  • Andrew

    Andrew was a joint project between Carnegie-Mellon University and IBM to set up a distributed computing environment on the CMU campus.

  • B

    brownfield (brownfield deployment, brownfield site)

    A brownfield deployment, in information technology, is the installation and configuration of new hardware or software that must coexist with legacy IT systems.

  • BSD (Berkeley Software Distribution)

    BSD (originally: Berkeley Software Distribution) refers to the particular version of the UNIX operating system that was developed at and distributed from the University of California at Berkeley.

  • C

    Categories of twisted pair cabling systems

    ANSI/EIA (American National Standards Institute/Electronic Industries Association) Standard 568 is one of several standards that specify "categories" (the singular is commonly referred to as "CAT") of twisted pair cabling systems, such as wires, junctions, and connectors.

  • channel extender

    A channel extender is a device used with IBM's S/390 line of computers to increase the maximum communication distances between the S/390 channel-connected mainframe computers, or between an S/390 and peripheral devices such as workstations, printers, and storage devices.

  • coaxial cable

    Coaxial cables transmit high-frequency electrical signals through connectors without interference.

  • D

    DB2

    DB2 is a family of relational database management system (RDBMS) products from IBM that serve a number of different operating system platforms.

  • E

    Electric plugs for each country

    Electrical plugs and voltages for different countries around the world.

  • I

    Information Technology (IT)

    Information technology (IT) is a general term that covers all forms of technology used to create, store, exchange, and use information in various forms.

  • infrastructure (IT infrastructure)

    Infrastructure is the foundation or framework that supports a system or organization.

  • L

    leaf-spine (leaf-spine architecture)

    Leaf-spine is a two-layer data center network topology that's useful for data centers that experience more east-west network traffic than north-south traffic. The topology is composed of leaf switches (to which servers and storage connect) and spine switches (to which leaf switches connect). Leaf switches mesh into the spine, forming the access layer that delivers network connection points for servers.

  • limited combustible cable (LCC)

    Limited combustible cable (LCC), also called CMP-50 cable, is fire-resistant cable with insulation made of a synthetic material called fluorinated ethylene propylene (FEP).

  • Linux swappiness

    Linux swappiness is the rate at which a Linux platform's kernel moves pages into and out of active memory.

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