September 2005

  • 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.21 Sep 2005

  • varicode

    Varicode is a method of binary character encoding in which the number of bits for each character is not fixed, but varies for each character depending on how often that character occurs in general ...21 Sep 2005

  • Serial Digital Interface (SDI)

    Serial Digital Interface (SDI) is a standard for digital video transmission over coaxial cable.21 Sep 2005

  • coarse wavelength division multiplexing (CWDM)

    Coarse wavelength division multiplexing (CWDM) is a method of combining multiple signals on laser beams at various wavelengths for transmission along fiber optic cables, such that the number of cha...21 Sep 2005

  • MFSK (multiple frequency shift keying)

    MFSK (multiple frequency shift keying), also called multi-frequency shift keying, is a method of signal modulation in which discrete audio tone bursts of various frequencies convey digital data.21 Sep 2005

  • integrated T1 (channelized T1)

    Integrated T1 (also called channelized T is a digital carrier modulation method in which a T1 line is divided into 24 channels, each having a maximum data speed of 64 thousand bits per second (Kbps...21 Sep 2005

  • keystone jack

    A keystone jack is a female connector used in data communications, particularly local area networks (LANs).21 Sep 2005

  • chiral fiber

    Chiral fiber is a specialized optical fiber medium with its core twisted into a helical shape.21 Sep 2005

  • network perimeter

    A network perimeter is the boundary between the private and locally managed-and-owned side of a network and the public and usually provider-managed side of a network.21 Sep 2005

  • Infranet Initiative

    The Infranet Initiative is a collaborative effort to develop a high-performance universal public network that would serve as a supplement to the Internet for businesses and other high-demand users.21 Sep 2005

  • zone

    In general, a zone is an area of administration.21 Sep 2005

  • B8ZS (bipolar 8-zero substitution, binary 8-zero substitution, clear channel, clear 64)

    B8ZS (bipolar 8-zero substitution, also called binary 8-zero substitution, clear channel, and clear 64) is an encoding method used on T1 circuits that inserts two successive ones of the same voltag...21 Sep 2005

  • distributive numerical control (DNC)

    Distributive numerical control (DNC) is a technology that allows a single computer to be networked with one or more machines that use computer numerical control (CNC).21 Sep 2005

  • terahertz (THz)

    The terahertz, abbreviated THz, is a unit of electromagnetic (EM) wave frequency equal to one trillion hertz (1012 Hz).21 Sep 2005

  • multimode fiber

    In optical fiber technology, multimode fiber is optical fiber that is designed to carry multiple light rays or modes concurrently, each at a slightly different reflection angle within the optical f...21 Sep 2005

  • queries-per-second (QPS)

    Queries-per-second (QPS) (or the query-per-second rate) is a measure of how much traffic a particular query server is handling at a given time.21 Sep 2005

  • discrete multitone (DMT)

    Discrete multitone (DMT) is a method of separating a Digital Subscriber Line (DSL) signal so that the usable frequency range is separated into 256 frequency bands (or channels) of 4.3125 KHz each.21 Sep 2005

  • RCA connector

    An RCA connector is a plug and a jack designed for use with coaxial cable for frequencies ranging from the very lowest up to several megahertz.21 Sep 2005

  • long-haul optics

    Long-haul optics refers to the transmission of visible light signals over optical fiber cable for great distances, especially without or with minimal use of repeaters.21 Sep 2005

  • triangulation

    Triangulation is a process by which the location of a radio transmitter can be determined by measuring either the radial distance, or the direction, of the received signal from two or three differe...21 Sep 2005