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  • 10BASE-36

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

  • DECT (Digital Enhanced Cordless Telecommunications)

    Unlike the analog cordless phones you may have in your home, DECT (Digital Enhanced Cordless Telecommunications) is a digital wireless telephone technology that is expected to make cordless phones much more common in both businesses and homes in the... 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

  • 10BASE-2

    10BASE-2, one of several physical media specified by IEEE 802.3 for use in an Ethernet local area network (LAN), consists of Thinwire coaxial cable with a maximum segment length of 185 meters. Continue Reading

  • 10BASE-5

    10BASE-5, one of several physical media specified by IEEE 802.3 for use in an Ethernet local area network (LAN), consists of Thickwire coaxial cable with a maximum segment length of 500 meters.Continue Reading

  • DARPA (Defense Advanced Research Projects Agency)

    DARPA (Defense Advanced Research Projects Agency) is the independent research branch of the U.S. Department of Defense that funded a project that in time was to lead to the creation of the Internet.Continue Reading

  • DOCSIS (Data Over Cable Service Interface Specifications)

    Now known as CableLabs Certified Cable Modems, DOCSIS (Data Over Cable Service Interface Specifications) is a standard interface for cable modems, the devices that handle incoming and outgoing data signals between a cable TV operator and a personal ...Continue Reading

  • Primary Rate Interface (PRI)

    In the Integrated Services Digital Network (ISDN), there are two levels of service: the Basic Rate Interface (BRI), intended for the home and small enterprise, and the Primary Rate Interface (PRI), for larger users.Continue Reading

  • symmetric communications

    Compare asymmetric communications.Continue Reading

  • phase-shift keying (PSK)

    Phase-shift keying (PSK) is a method of digital communication in which the phase of a transmitted signal is varied to convey information.Continue Reading

  • ACTA (America's Carriers Telecommunications Association)

    ACTA (America's Carriers Telecommunications Association) is a lobbying organization for over 165 small long-distance telephone carrier companies.Continue Reading

  • softswitch

    Softswitch (software switch) is a generic term for any open application program interface (API) software used to bridge a public switched telephone network (PSTN) and Voice over Internet Protocol (VOiP) by separating the call control functions of a ...Continue Reading

  • value-added network (VAN)

    A value-added network (VAN) is a private network provider (sometimes called a turnkey communications line) that is hired by a company to facilitate electronic data interchange (EDI) or provide other network services.Continue Reading

  • small form factor (SFF)

    Small form factor (SFF) refers to any of several physically compact connector designs that have been developed for use in fiber optic systems.Continue Reading

  • metropolitan area network (MAN)

    A metropolitan area network (MAN) is a network that interconnects users with computer resources in a geographic area or region larger than that covered by even a large local area network (LAN) but smaller than the area covered by a wide area network...Continue Reading

  • small form-factor pluggable (SFP)

    Small form-factor pluggable (SFP) is a specification for a new generation of optical modular transceivers.Continue Reading

  • infranet

    The infranet is a proposed universal, public, packet-switched supplement to the Internet for businesses and high-demand private users that would provide guaranteed security, reliability, and quality of service (QoS).Continue Reading

  • hybrid fiber coaxial network (HFC network)

    A hybrid fiber coaxial (HFC) network is a telecommunication technology in which optical fiber cable and coaxial cable are used in different portions of a network to carry broadband content (such as video, data, and voice).Continue Reading

  • moonbounce or Earth-Moon-Earth (EME)

    Moonbounce, also called Earth-Moon-Earth (EME), is a form of wireless communication in which the moon is used as a passive satellite.Continue Reading

  • Basic Rate Interface (BRI)

    In the Integrated Services Digital Network (ISDN), there are two levels of service: the Basic Rate Interface (BRI), intended for the home and small enterprise, and the Primary Rate Interface (PRI), for larger users.Continue Reading

  • gigahertz (GHz)

    The gigahertz, abbreviated GHz, is a unit of alternating current (AC) or electromagnetic (EM) wave frequency equal to one thousand million hertz (1,000,000,000 Hz).Continue Reading

  • subnetwork

    A subnetwork is a separately identifiable part of a larger network that typically represents a certain limited number of host computers, the hosts in a building or geographic area, or the hosts on an individual local area network.Continue Reading

  • Veronica

    Veronica is a program that allowed you to search the files of the Internet's Gopher servers for a particular search string.Continue Reading

  • Home Phoneline Networking Alliance (HPNA)

    The HPNA (Home Phoneline Networking Alliance) is an industry group that promotes standards for using existing phone lines and jacks to interconnect computers within a home.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

  • U interface

    In Integrated Services Digital Network (ISDN) Basic Rate Interface service, a U interface is the electrical interface for the single twisted pair wire connection from a local phone company (the central office) to a home or business.Continue Reading

  • V.xx

    The V Series Recommendations from the ITU-TS are summarized in the table below.Continue Reading

  • vampire tap

    A vampire tap is a connection to a coaxial cable in which a hole is drilled through the outer shield of the cable so that a clamp can be connected to the inner conductor of the cable.Continue Reading

  • 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).Continue Reading

  • T1 (T-1)

    Also see the T-carrier system, of which the T1 is a part.Continue Reading

  • netsplit

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

  • media attachment unit (MAU)

    MAU is also sometimes used as the abbreviation for the token ring network multistation access unit (MSAU).Continue Reading

  • local access and transport area (LATA)

    LATA (local access and transport area) is a term in the U.S. for a geographic area covered by one or more local telephone companies, which are legally referred to as local exchange carriers (LECs).Continue Reading

  • EtherExpress

    EtherExpress is a technology from Intel that is used in network server adapters (devices that attach the server to the network cable) for Ethernet-based local area networks (LANs).Continue Reading

  • iNet

    An iNet (pronounced AI-neht) is any network that uses the Internet Protocol (IP).Continue Reading

  • text on nine keys (T9)

    Text on nine keys (T9) is a system that lets fixed and mobile phone users send text messages by pressing a number key for each letter in the message -- effectively making a keyboard out of the nine numeric phone entry keys.Continue Reading

  • RS-232C

    RS-232C is a long-established standard ("C" is the current version) that describes the physical interface and protocol for relatively low-speed serial data communication between computers and related devices.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

  • conductance

    Conductance is an expression of the ease with which electric current flows through a substance.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

  • home network

    Using Mobile IP (Mobile Internet Protocol), the home network is where a mobile device has its permanent IP address.Continue Reading

  • Preboot Execution Environment (PXE)

    The Preboot Execution Environment (PXE) is an industry standard client/server interface that allows networked computers that are not yet loaded with an operating system to be configured and booted remotely by an administrator.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

  • multihomed

    Multihomed describes a computer host that has multiple IP addresses to connected networks.Continue Reading

  • Point-to-Point Tunneling Protocol (PPTP)

    Point-to-Point Tunneling Protocol (PPTP) is a protocol (set of communication rules) that allows corporations to extend their own corporate network through private "tunnels" over the public Internet.Continue Reading

  • plesiochronous

    Plesiochronous (pronounced plee-see-AH-krun-us, from Greek plesos, meaning close, and chronos, meaning time) is an adjective that describes operations that are almost, but not quite, in synchronization - in other words, almost synchronous.Continue Reading

  • erbium amplifier

    An erbium amplifier, also called optical amplifier or an erbium-doped fiber amplifier or EDFA, is an optical or IR repeater that amplifies a modulated laser beam directly, without opto-electronic and electro-optical conversion.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

  • B-channel (bearer channel)

    In the Integrated Services Digital Network (ISDN), the B-channel is the channel that carries the main data.Continue Reading

  • ARPA (Advanced Research Projects Agency)

    An agency of the United States Department of Defense, ARPA (Advanced Research Projects Agency) underwrote development for the precursor of the Internet, known as ARPANET. Initially a modest network of four interconnected university computers, ...Continue Reading

  • 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

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