Networking Definitions

  • C

    cable modem termination system (CMTS)

    A cable modem termination system (CMTS) is a component that exchanges digital signals with cable modems on a cable network.

  • call failure rate (CFR)

    The call failure rate (CFR) is the percentage of calls to an ISP or any network provider that fail to get through. The CFR is commonly used as a statistical measure in assessing Internet service providers.

  • CAPWAP (Control and Provisioning of Wireless Access Points)

    CAPWAP (Control and Provisioning of Wireless Access Points) is a standardized protocol that enables wireless LAN (WLAN) controllers to centrally manage a group of wireless access points (APs).

  • care-of address

    In Internet routing, a care-of address is a temporary IP address for a mobile node (mobile device) that enables message delivery when the device is connecting from somewhere other than its home network.

  • carrier detect

    Carrier detect (see modem lights) is a control signal between a modem and a computer that indicates that the modem detects a "live" carrier that can be used for sending and receiving information.

  • Carrier Sense Multiple Access/Collision Detect (CSMA/CD)

    Carrier Sense Multiple Access/Collision Detect (CSMA/CD) is the protocol for carrier transmission access in Ethernet networks.

  • carrier-to-noise ratio (CNR or C/N)

    In communications, the carrier-to-noise ratio, often written CNR or C/N, is a measure of the received carrier strength relative to the strength of the received noise.

  • catchment area

    In the context of communication networks, a catchment area describes the geographical boundries of a network's components, including its connecting lines.

  • 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 community antenna, cable TV is an increasingly popular way to interact with the World Wide Web and other new forms of multimedia information and entertainment services.

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

    The CCITT, now known as 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.

  • CCNA certification

    Cisco Certified Network Associaten (CCNA) is an entry-level certification for the Cisco certified professional program.

  • CDDI (Copper Distributed Data Interface)

    For a local area network (LAN), CDDI (Copper Distributed Data Interface) is a standard for data transmission based on FDDI (Fiber Distributed Data Interface) that uses shielded twisted-pair (STP) or unshielded twisted pair (UTP) copper wire instead of fiber optic lines.

  • CDPD (Cellular Digital Packet Data)

    CDPD (Cellular Digital Packet Data) is a specification for supporting wireless access to the Internet and other public packet-switched networks.

  • CDSL (Consumer Digital Subscriber Line)

    Also see our Fast guide to DSL. CDSL (Consumer Digital Subscriber Line) is a version of Digital Subscriber Line (DSL) service, trademarked by Rockwell Corp.

  • 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.

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