CH13 - Key Terms Small

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CH13 - Key Terms Small
2010-12-13 17:18:00
key terms

key terms
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  1. A DDS technology that uses two two-wire pairs to transmit full-duplex data signals at a maximum rate of 1.544 Mbps.
  2. A communication line that has 28 T1s or 672 channels and supports a data rate of 44.736 Mbps.
  3. One or more of the 24 channels (but not all) of a T1 connection.
    fractional T1
  4. A technology that enables several communication streams to travel simultaneously over the same cable segment
  5. Digital point-to-point leased communication links offered by local and long-distance telcos. Lease terms are based on per-minute use charges, not on 24-hour, seven-day dedicated circuits.
    switched 56K
  6. A WAN technology that offers increments of 64 Kbps connections, most often used by SOHO (small office/home office) users.
    Integrated Services Digital Network (ISDN)
  7. An ISDN version that provides two 64 Kbps B-channels. Generally used for remote connections.
    Basic Rate Interface (BRI)
  8. An ISDN version that provides 23 64-Kbps B-channels.
    Primary Rate Interface (PRI)
  9. An ISDN variation that supports much higher data rates than standard ISDN and works with other technologies, such as ATM, SONET, and frame relay.
    Broadband ISDN (B-ISDN)
  10. Also known as PSTN, the normal telephone communications system. See also public switched telephone network (PTSN).
    plain old telephone service (POTS)
  11. A point-to-point permanent virtual circuit (PVC) technology that offers WAN communications over a fast, reliable, digital packet-switching network
    frame relay
  12. A logical sequence of connections with bandwidth allocated for a specific transmission pathway.
    virtual circuits
  13. Pathways between two communication points that are established as permanent logical connections; therefore, the pathway exists even when it’s not in use.
    permanent virtual circuits (PVCs)
  14. A communication circuit that’s established when needed and then terminated when the transmission is completed.
    switched virtual circuits (SVCs)
  15. A WAN protocol that defines how devices communicate over an internetwork. X.25 networks are SVC networks, meaning they create the best available pathway for transmission at the time of transmission.
  16. WAN services, usually provided by private companies, for the purpose of enabling WAN technologies, such as X.25.
    public data networks (PDNs)
  17. A device that supports X.25 communications for low-speed, character-based terminals.
    packet assembler/disassembler (PAD)
  18. A guaranteed minimum transmission rate offered by the service provider.
    Committed Information Rate (CIR)
  19. A device that links a computer or network to a DDS communications link.
    Channel Service Unit/Data Service Unit (CSU/DSU)
  20. The equipment at the customer site that’s usually the responsibility of the customer.
    customer premises equipment (CPE)
  21. The point at which the CPE ends and the provider’s equipment responsibility begins.
    demarcation point
  22. The connection between a WAN’s demarcation point and the central office (CO). See also last mile.
    local loop
  23. The connection between a WAN’s demarcation point and the central office (CO). See also local loop.
    last mile
  24. The device that sends data to (and receives data from) the local loop, usually a CSU/DSU or modem.
    data circuit-terminating equipment (DCE)
  25. The device that passes data from the customer LAN to the DCE, usually a router.
    data terminal equipment (DTE)