Networking Definitions

This glossary explains the meaning of key words and phrases that information technology (IT) and business professionals use when discussing networking and related software products. You can find additional definitions by visiting WhatIs.com or using the search box below.

  • C

    CRC-4 (Cyclic Redundancy Check 4)

    CRC-4 (Cyclic Redundancy Check 4) is a form of cyclic redundancy checking (a method of checking for errors in transmitted data) that is used on E-1 trunk lines.

  • cross-bar switch

    In a network, a cross-bar switch is a device that is capable of channeling data between any two devices that are attached to it up to its maximum number of ports.

  • crossover cable

    A crossover cable is a cable that is used to interconnect two computers by "crossing over" (reversing) their respective pin contacts.

  • crosstalk

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

  • CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance)

    CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) is a protocol for carrier transmission in 802.11 networks.

  • CSU/DSU (Channel Service Unit/Data Service Unit)

    A CSU/DSU (Channel Service Unit/Data Service Unit) is a hardware device about the size of an external modem that converts a digital data frame from the communications technology used on a local area network (LAN) into a frame appropriate to a wide-area network (WAN) and vice versa.

  • CTI (computer-telephony integration)

    CTI (computer-telephony integration), or sometimes simply "computer telephony," is the use of computers to manage telephone calls.

  • customer premises equipment (CPE)

    Customer premises equipment (CPE) is telephone or other service provider equipment that is located on the customer's premises (physical location) rather than on the provider's premises or in between.

  • cycles per second (CPS)

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

  • cyclic redundancy checking

    Cyclic redundancy checking is a method of checking for errors in data that has been transmitted on a communications link.

  • D

    D-channel

    In the Integrated Services Digital Network (ISDN), the D-channel is the channel that carries control and signalling information.

  • 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.

  • dark fiber

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

  • darknet

    A darknet is a routed allocation of IP address space that is not discoverable by any usual means.

  • 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.

-ADS BY GOOGLE

SearchUnifiedCommunications

SearchMobileComputing

SearchDataCenter

SearchITChannel

Close