Chapter 6 Definitions

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  1. Horizontal Cabling
    Cabling that connects the equipment room to the work areas.
  2. Run
    A single piece of installed horizontal cabling.
  3. Solid Core
    A cable that uses a single solid wire to transmit signals.
  4. Stranded Core
    A cable that uses a bundle of tiny wire strands that transmit signals.  Stranded core is not quite as good a conductor as solid core, but it will stand up to substantial handling without breaking.
  5. Impedance
    The amount of resistance to an electrical signal on a wire.  It is used as a relative measure of the amount of data a cable can handle.
  6. Intermediate Distribution Frame (IDF)
    The room where all the horizontal runs from all the work areas on a given floor in a building come together.
  7. Equipment Rack
    A metal structure used in equipment rooms to secure network hardware devices and patch panels.  Most racks are 19" wide.  Devices designed to fit in such a rack use a height measurement called units, or simply U.
  8. Patch Panel
    A panel containing a row of female connectors (ports) that terminate the horizontal cabling in the equipment room.  Patch panels facilitate cabling organization and provide protection to horizontal cabling.
  9. 110-Punchdown Block
    The most common connection used on the back of an RJ-45 jack and patch panels.
  10. Demarc (demarcation point)
    A device that marks the dividing line of responsibility for the functioning of a network between internal users and upstream service providers.
  11. Network interface Unit (NIU)
    In a private home, the DSL or cable modem supplied by your ISP that serves as a demarc between your home network and your ISP, and most homes have an a network interface box.
  12. Smark Jack
    Type of NIU that enables ISPs or telephone companies to test for faults in a network, such as disconnections and loopbacks.
  13. Demarc Extension
    Any cabling that runs from the network interface to whatever box is used by the customer as a demarc.
  14. Multiplexer
    A device that merges information from multiple input channels to a single output channel.
  15. Vertical Cross-Connect
    Main patch panel in telecommunications room.
  16. Main Distribution Frame (MDF)
    The room in a building that stores the demarc, telephone cross-connects, and Lan cross-connects.
  17. Cable Drop
    Location where the cable comes out of the wall at the workstation location.
  18. Raceway
    Cable organizing device that adheres to walls, making for a much simpler, though less neat, installation than running cables in the walls.
  19. Mounting Bracket
    Bracket that acts as a holder for a face plate in cable installations.
  20. Continuity
    The physical connection of wires in a network.
  21. Cable Tester
    A generic name for a device that tests cables.  Some common tests are continuity, electrical shorts, crossed wires, or other electrical characteristics.
  22. Wiremap
    Term that techs use to refer to the proper connectivity of wires in a network.
  23. Time Domain Reflectometer (TDR)
    Advanced cable tester that tests the length of cables and their continuity or discontinuity, and identifies the location of any discontinuity due to a bend, break, unwanted crimp, and so on.
  24. Crosstalk
    Electrical signal interference between two cables that are in close proximity to each other.
  25. Near end crosstalk (NEXT)
    Crosstalk at the same end of a cable from which the signal is being generated.
  26. Far-End Crosstalk (FEXT)
    Crosstalk on the opposite end of a cable from the signal's source.
  27. Decibel (dB)
    The measurement of the quality of the signal
  28. Attenuation
    The degradation of signal over distance for a networking cable.
  29. Cable certifiier
    A very powerful cable testing device used by professional installers to test the electrical characteristics of a cable and then generate a certification report, proving that cable runs pass TIA/EIA standards
  30. Link Aggregation Control Protocol (LACP)
    Controls how multiple network devices send and receive data as a single connection.
  31. Optic time domain reflector (OTDR)
    Tester for fiber-optic cable that determines continuity and reports the location of cable breaks.
Card Set
Chapter 6 Definitions
Network Cabling
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