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Network Infrastructure

  • cable head-end

    A cable head-end (or headend) is the facility at a local cable TV office that originates and communicates cable TV services and cable modem services to subscribers. Continue Reading

  • balun

    A balun is a device that joins a balanced line (one that has two conductors, with equal currents in opposite directions, such as a twisted pair cable) to an unbalanced line (one that has just one conductor and a ground, such as a coaxial cable). Continue Reading

  • lambda switching (photonic switching, or wavelength switching)

    Lambda switching (sometimes called photonic switching, or wavelength switching) is the technology used in optical networking to switch individual wavelengths of light onto separate paths for specific routing of information. Continue Reading

  • 10BASE-36

    10BASE-36 is a type of physical cabling defined in the IEEE 802.3 (Ethernet) standard for broadband application. Continue Reading

  • Transmeta

    Transmeta is a Silicon Valley start-up company known for its recruitment of high profile talent and its Crusoe chip, designed for mobile Internet computing. Continue Reading

  • well-known port numbers

    The well-known port numbers are the port numbers that are reserved for assignment by the Internet Corporation for Assigned Names and Numbers (ICANN) for use by the application end points that communicate using the Internet's Transmission Control ...Continue Reading

  • ferrule

    A ferrule (from Latin viriola, meaning little bracelet) is a ring or cap attached to an object to protect against damage, splitting, or wear.Continue Reading

  • egress

    Egress (pronounced EE-grehs, from Latin egressus, or going out) is the act of going out of something.Continue Reading

  • netsplit

    In using an Internet Relay Chat (IRC) network, a netsplit is the loss of contact between two IRC servers.Continue Reading

  • fractional T1

    A fractional T1 or T3 line is a T1 or T3 digital phone line in the North American T-carrier system that is leased to a customer at a fraction of its data-carrying capacity and at a correspondingly lower cost.Continue Reading

  • triplecast

    A triplecast (TM) is the simultaneous broadcast of a program on television, radio, and an Internet site or channel.Continue Reading

  • EPOC

    EPOC is an operating system designed for small, portable computer-telephones with wireless access to phone and other information services.Continue Reading

  • brouter

    A brouter (pronounced BRAU-tuhr or sometimes BEE-rau-tuhr) is a network bridge and a router combined in a single product.Continue Reading

  • repeater

    In digital communication systems, a repeater is a device that receives a digital signal on an electromagnetic or optical transmission medium and regenerates the signal along the next leg of the medium.Continue Reading

  • active network

    An active network is a network in which the nodes are programmed to perform custom operations on the messages that pass through the node.Continue Reading

  • BNC (Bayonet Neil-Concelman or British Naval Connector)

    A BNC (Bayonet Neil-Concelman, or sometimes British Naval Connector) connector is used to connect a computer to a coaxial cable in a 10BASE-2 Ethernet network. 10BASE-2 is a 10 MHz baseband network on a cable extending up to 185 meters - the 2 is a ...Continue Reading

  • Network routers: Crash Course

    Network routers make an enterprise network run. This crash course gives you all the router basics you need.Continue Reading

  • port 80

    On a Web server or Hypertext Transfer Protocol daemon, port 80 is the port that the server "listens to" or expects to receive from a Web client, assuming that the default was taken when the server was configured or set up.Continue Reading

  • SCART connector

    A SCART connector is a physical and electrical interconnection between two pieces of audio-visual equipment, such as a television set and a video cassette recorder (VCR).Continue Reading

  • dark fiber

    Dark fiber is optical fiber infrastructure (cabling and repeaters) that is currently in place but is not being used.Continue Reading

  • S interface

    In Integrated Services Digital Network (ISDN) service, an S interface is the electrical interface between a network terminating unit 1 (NT and up to eight addressable devices such as a computer or a telephone.Continue Reading

  • signal

    In electronics, a signal is an electric current or electromagnetic field used to convey data from one place to another.Continue Reading

  • twinaxial cable

    Twinaxial cable is coaxial cable that contains two inner conducting wires rather than one.Continue Reading

  • splitter

    In telephony, a splitter, sometimes called a "plain old telephone service splitter," is a device that divides a telephone signal into two or more signals, each carrying a selected frequency range, and can also reassemble signals from multiple signal...Continue Reading

  • Joint Academic Network (JANET)

    In the United Kingdom, JANET (Joint Academic Network) is the main backbone network for the UK university system of academic and research computers.Continue Reading

  • Constellation

    Constellation was the early name for the Communicator browser and related programs from Netscape Communications.Continue Reading

  • private automatic branch exchange (PABX)

    A private automatic branch exchange (PABX) is an automatic telephone switching system within a private enterprise.Continue Reading

  • vBNS (very high-speed Backbone Network Service)

    The vBNS (very high-speed Backbone Network Service) is a network that interconnects a number of supercomputer centers in the United States and is reserved for science applications requiring the massive computing that supercomputers can provide.Continue Reading

  • teleportation

    Teleportation is the duplication or re-creation of physical objects or their properties using light beams, according to researchers at the California Institute of Technology.Continue Reading

  • Webcast

    Also see push technology, another usage.Continue Reading

  • Forward DNS lookup

    Forward DNS lookup is using an Internet domain name to find an IP address.Continue Reading

  • frame rate

    In motion pictures, television, and in computer video displays, the frame rate is the number of frames or images that are projected or displayed per second.Continue Reading

  • mutex (mutual exclusion object)

    In computer programming, a mutex (mutual exclusion object) is a program object that is created so that multiple program thread can take turns sharing the same resource, such as access to a file.Continue Reading

  • burst

    Burst is a term used in a number of information technology contexts to mean a specific amount of data sent or received in one intermittent operation.Continue Reading

  • loading coil

    A loading coil is an induction device placed on a local loop longer than 18,000 feet that carries analog signals.Continue Reading

  • American Wire Gauge (AWG)

    American Wire Gauge (AWG) is a U.S. standard set of non-ferrous wire conductor sizes.Continue Reading

  • terminal adapter (TA)

    A terminal adapter (TA) is a hardware interface between a computer and an Integrated Services Digital Network line.Continue Reading

  • fiberless optics

    Fiberless optics, a term that has been trademarked by Terabeam Networks, is a technology for transmitting large amounts of data on light waves sent through space rather than along an optical fiber cable, thus offering a surprising new solution to ...Continue Reading

  • single mode fiber

    In optical fiber technology, single mode fiber is optical fiber that is designed for the transmission of a single ray or mode of light as a carrier and is used for long-distance signal transmission.Continue Reading

  • set-top box

    A set-top box is a device that enables a television set to become a user interface to the Internet and also enables a television set to receive and decode digital television (DTV) broadcasts.Continue Reading

  • clone

    A clone is an identical copy of something and is a term that first became familiar to the public from the biosciences.Continue Reading

  • cycles per second (CPS)

    Cps (cycles per second) is the measure of how frequently an alternating current changes direction.Continue Reading

  • FTP cable (foil screened twisted pair cable)

    FTP (foil screened twisted pair) cable is a cable containing multiple pairs of copper wire enclosed in a sheath of aluminum foil.Continue Reading

  • address

    An address can mean the unique location of either ( an Internet server, (2) a specific file (for example, a Web page), or (3) an e-mail user. It is also used to specify the location of data within computer storage.Continue Reading

  • bit stream

    A bit stream is a contiguous sequence of bits, representing a stream of data, transmitted continously over a communications path, serially (one at a time).Continue Reading

  • encoder

    In digital audio technology, an encoder is a program that converts an audio WAV file into an MP3 file, a highly-compressed sound file that preserves the quality of a CD recording.Continue Reading

  • Design, install and evaluate

    Network administrator tips for designing, installing and evaluating your network.Continue Reading

  • Learning Guide: Voice over IP basics

    This guide contains all the VoIP basics and essentials you will need when implementing an IP telephony network.Continue Reading

  • Basics on subnet masks and IP addresses

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  • Basic networking definitions

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