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Bring yourself up to speed with our introductory content.

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Bring yourself up to speed with our introductory content.

  • X terminal

    An X terminal is typically a diskless computer especially designed to provide a low-cost user interface for applications that run in a network X server as part of a distributed X Window System. Continue Reading

  • AUI (attachment unit interface)

    The AUI (attachment unit interface) is the 15-pin physical connector interface between a computer's network interface card (NIC) and an Ethernet cable. Continue Reading

  • modem doubling

    Modem doubling is an inexpensive way for a user who wants a fast Internet connection, but can only connect with an analog telephone line, to use two 56kbps modems to double their bandwidth. Continue Reading

  • SMDS (Switched Multimegabit Data Service)

    SMDS (Switched Multimegabit Data Service) is a public, packet-switched service aimed at enterprises that need to exchange large amounts of data with other enterprises over the wide-area network on a nonconstant or "bursty" basis. Continue Reading

  • downloading

    Downloading is the transmission of a file from one computer system to another, usually smaller computer system. Continue Reading

  • Dialed Number Identification Service (DNIS)

    DNIS (Dialed Number Identification Service) is a telephone service that identifies for the receiver of a call the number that the caller dialed.Continue Reading

  • Wake on LAN

    Wake on LAN is a technology that allows a network professional to remotely power on a computer or to wake it up from sleep mode.Continue Reading

  • LMDS (Local Multipoint Distribution System)

    LMDS (Local Multipoint Distribution System) is a system for broadband microwave wireless transmission direct from a local antenna to homes and businesses within a line-of-sight radius, a solution to the so-called last-mile technology problem of ...Continue Reading

  • network terminator 1 (NT1)

    Using the Integrated Services Digital Network (ISDN) Basic Rate Interchange (Basic Rate Interface in ISDN) service, an NT1 (network terminating unit is a device that accepts a two-wire signal from the phone company and converts it to a four-wire ...Continue Reading

  • downstream

    This term should not be confused with downlink.Continue Reading

  • FRAD (frame relay access device or frame relay assembler/dissembler)

    A FRAD (frame relay access device; also sometimes referred to as a frame relay assembler/dissembler) is a box that encapsulates (puts frame relay header and trailer information on) outgoing data packets and decapsulates (removes frame relay headers ...Continue Reading

  • Thinnet

    Thicknet and Thinnet (sometimes called ThickWire and ThinWire) are commonly used terms for the larger and smaller size of coaxial cable used in Ethernet local area networks.Continue Reading

  • RNIS (Reseau Numerique a Integration de Services)

    RNIS (Reseau Numerique a Integration de Services) is the European name for Integrated Services Digital Network (ISDN).Continue Reading

  • telecenter

    A telecenter (US spelling) or telecentre (UK spelling) is a work location usually in a different place than the organization's main office that provides convenient occasional access for telecommuting to work equipment that they don't have at home or...Continue Reading

  • ECC (error correction code or error checking and correcting)

    ECC (either "error correction [or correcting] code" or "error checking and correcting") allows data that is being read or transmitted to be checked for errors and, when necessary, corrected on the fly.Continue Reading

  • Mesh Connectivity Layer (MCL)

    Mesh Connectivity Layer (MCL) is a technology that allows a computer user to connect to a wireless mesh network that uses Wi-Fi or WiMax. The wireless mesh network can be connected to the Internet through a single computer using a leased T-1 line ...Continue Reading

  • Aloha (Aloha method)

    Aloha, also called the Aloha method, refers toa simple communications scheme in which each source (transmitter) in a network sends data wheneverthere is a frame to send.Continue Reading

  • virtual network adapter

    A virtual network adapter is a program (instead of a physical network adapter) that allows a computer to connect to a network. A virtual network adapter can also be used to connect all the computers on a local area network (LAN) to a larger network ...Continue Reading

  • Crash Course: VLANs

    These resources will provide you with all the information needed to understand VLANs, from what they are to what they do and how they do it.Continue Reading

  • Guide to network performance management

    This guide introduces you to network management best practices and pitfalls to avoid, and provides troubleshooting help and advice for monitoring and maintaining your network for best performance.Continue Reading

  • daisy chain

    A daisy chain is an interconnection of computer devices, peripherals, or network nodes in series, one after another. It is the computer equivalent of a series electrical circuit.Continue Reading

  • Advanced router configuration and management: Crash Course

    Once you've mastered the basics, it's time to learn some of the more advanced features of the router. Check out these informative tips and indepth technical advice and take your router knowledge to the next level.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

  • pulse code modulation (PCM)

    Pulse code modulation (PCM) is a digitalscheme for transmitting analogdata.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

  • central office (CO)

    In telephone communication in the United States, a central office (CO) is an office in a locality to which subscriber home and business lines are connected on what is called a local loop.Continue Reading

  • CATV (community access television)

    CATV (originally "community antenna television," now often "community access television") is more commonly known as "cable TV." In addition to bringing television programs to those millions of people throughout the world who are connected to a ...Continue Reading

  • Routing protocol basics, part 1

    A detailed look at the characteristics of IGP routing protocols RIP and IGRP/EIGRP.Continue Reading

  • Telecommunications Act of 1996

    The Telecommunications Act of 1996, enacted by the U.S. Congress on February 1, 1996, and signed into law by President Bill Clinton on February 8, 1996, provided major changes in laws affecting cable TV, telecommunications, and the Internet.Continue Reading

  • soliton

    A soliton is a special form of light pulse that can be transmitted over a fiber optic channel.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

  • transit

    Transit is the connection to and use of a telecommunication path provided by a vendor.Continue Reading

  • Phone numbers

    Resources for looking up phone numbers.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

  • LEC (local exchange carrier)

    LEC (local exchange carrier) is the term for a public telephone company in the U.S. that provides local service.Continue Reading

  • bit robbing

    Bit robbing is a technique used in signaling on the T-carrier system, the widely-used system for transmitting both voice and data in digital form in the public switched telephone network (PSTN) and in private networks.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

  • dial-up

    Dial-up pertains to a telephone connection in a system of many lines shared by many users.Continue Reading

  • LANDesk Client Manager (LDCM)

    LDCM (LANDesk Client Manager) is a software product from Intel that lets a system administrator for a local area network () see the configurations and monitor the status of personal computer on the LAN. LDCM is an implementation of the Desktop ...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

  • BOC (Bell operating company)

    BOC (Bell operating company) is a term for any of the 22 original companies (or their successors) that were created when AT&T was broken up in 1983 and given the right to provide local telephone service in a given geographic area.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

  • CPNI (Customer Proprietary Network Information)

    In the United States, CPNI (Customer Proprietary Network Information) is information that telecommunications services such as local, long distance, and wireless telephone companies acquire about their subscribers.Continue Reading

  • Fcc

    In Eudora and perhaps other e-mail facilities, you'll see the abbreviations "Fcc" and "Bcc".Continue Reading

  • Constellation

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

  • SPID (Service Profile Identifier)

    A SPID (Service Profile Identifier) is a number assigned by a phone company to a terminal on an Integrated Services Digital Network B-channel.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

  • Location Routing Number (LRN)

    In the U.S., a Location Routing Number (LRN) is a 10-digit number in a database called a Service Control Point (SCP) that identifies a switching port for a local telephone exchange.Continue Reading

  • universal network

    The "universal network" is the idea of a single network that integrates the existing voice and public telecommunications network (including the Internet), cable TV, data networks, and video broadcast networks so that they work together well.Continue Reading

  • virtual server

    On the Internet, a virtual server is a server (computer and various server programs) at someone else's location that is shared by multiple Web site owners so that each owner can use and administer it as though they had complete control of the server.Continue Reading

  • Undernet

    For terms frequently used in online keyboard chatting, see chat acronyms/IRC/BBS. According to its home page, the Undernet is the largest network of Internet Relay Channels (IRC) on the Internet.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

  • STDM (statistical time division multiplexing)

    STDM, or statistical time division multiplexing, is one method for transmitting several types of data simultaneously across a single transmission cable or line (such as a T1 or T3 line).Continue Reading

  • line information database (LIDB)

    A line information database (LIDB) is a database maintained by the local telephone company that contains subscriber information, such as a service profile, name and address, and credit card validation information.Continue Reading

  • frame

    See frames for the use of multiple Web pages on a single display screen.Continue Reading

  • last-mile technology

    Last-mile technology is any telecommunications technology that carries signals from the broad telecommunication backbone along the relatively short distance (hence, the "last mile") to and from the home or business.Continue Reading

  • Forward DNS lookup

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

  • Federation of Telecommunications Engineers of the European Community (FITCE)

    FITCE (Federation of Telecommunications Engineers of the European Community) is an international association that is committed to affecting telecommunication developments in a positive and constructive manner throughout Europe and the rest of the ...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

  • ATU-R (ADSL Terminal Unit - Remote)

    An ATU-R (ADSL Terminal Unit - Remote), sometimes called an "ADSL modem," is a hardware unit that is installed in any computer that uses a telephone company connection with Asymmetric Digital Subscriber Line (ADSL) service.Continue Reading

  • digital switch

    A digital switch is a device that handles digital signals generated at or passed through a telephone company central office and forwards them across the company's backbone network.Continue Reading

  • mux

    In communication transmission systems, mux (pronounce muks, sometimes spelled "MUX") is an abbreviation for multiplexing, a device that sends multiple signals on a carrier channel at the same time in the form of a single, complex signal to another ...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

  • ITU-T (Telecommunication Standardization Sector of the International Telecommunications Union)

    The ITU-T (for Telecommunication Standardization Sector of the International Telecommunications Union) is the primary international body for fostering cooperative standards for telecommunications equipment and systems.Continue Reading

  • demarc (demarcation point)

    A demarc (an abbreviation for demarcation point) marks the point where communications facilities owned by one organization interface with that of another organization.Continue Reading

  • transceiver

    A transceiver is a combination transmitter/receiver in a single package.Continue Reading

  • local loop

    In telephony, a local loop is the wired connection from a telephone company's central office in a locality to its customers' telephones at homes and businesses.Continue Reading

  • crosstalk

    Crosstalk is a disturbance caused by the electric or magnetic fields of one telecommunication signal affecting a signal in an adjacent circuit.Continue Reading

  • mil

    mil is one of the top-level domain names that can be used when choosing a domain name.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

  • K56flex

    Rockwell Corporation's K56flex modem chipset gave users the capability to receive data on ordinary phone lines at 56 Kbps (thousand bits per second).Continue Reading

  • x2

    x2 is a technology from US Robotics (now 3Com) for the downstream transmission of data over ordinary phone lines at 56 Kbps (thousands of bits per second).Continue Reading

  • aggregator

    Like its synonym concentrator, an aggregator is any device that serves multiple other devices or users either with its own capabilities or by forwarding transmissions in a more concentrated and economical way.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

  • akamaize

    For a Web site, to akamaize (pronounced AHK-uh-myez) is to accelerate the delivery of Web files by placing copies on servers closer to the user than the server that delivers the main file for a Web page.Continue Reading

  • i-Mode

    i-Mode is the packet-based service for mobile phones offered by Japan's leader in wireless technology, NTT DoCoMo.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

  • telco (telephone company)

    In the United States and possibly other countries, "telco" is a short form for telephone company.Continue Reading

  • optoelectronics

    Optoelectronics is a branch of electronics that overlaps with physics.Continue Reading

  • bit rate

    In digital telecommunication, the bit rate is the number of bits that pass a given point in a telecommunication network in a given amount of time, usually a second.Continue Reading

  • frequency-division multiplexing (FDM)

    Frequency-division multiplexing (FDM) is a scheme in which numerous signals are combined for transmission on a single communications line or channel.Continue Reading

  • rlogin (remote login)

    Rlogin (remote login) is a UNIX command that allows an authorized user to login to other UNIX machines (hosts) on a network and to interact as if the user were physically at the host computer.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

  • slamming

    Slamming is the practice by some U.S. long-distance phone carriers of switching users to their service without the user's knowledge or authorization.Continue Reading

  • petabit

    A petabit is one quadrillion (1015) binary digits and is used in discussing possible volumes of data traffic per second in a large telecommunications network.Continue Reading

  • Bellcore (Bell Communications Research)

    Bellcore (Bell Communications Research) provides certain centralized research and standards coordination for the regional Bell operating companies (RBOC)s.Continue Reading

  • splitterless

    Splitterless refers to a type of Digital Subscriber Line (DSL) telephone service that does not require the installation of a plain old telephone service splitter at the customer location.Continue Reading

  • Advanced Intelligent Network (AIN)

    The Advanced Intelligent Network (AIN) is a telephone network architecture that separates service logic from switching equipment, allowing new services to be added without having to redesign switches to support new services.Continue Reading

  • ACTS (Automatic Coin Telephone System)

    ACTS (Automatic Coin Telephone System) is a public coin-operated telephone service that completes a variety of phone calls, times the calls, and collects payment without the aid of an operator.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

  • htaccess

    .htaccess is the default name for a file that is used to indicate who can or cannot access the contents of a specific file directory from the Internet or an intranet.Continue Reading

  • cycles per second (CPS)

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

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