CompTIA Network+ N10-004: 2.1 – Cable Properties

| June 17, 2009


Every cable has a set of important networking properties. In this video, we’ll show you how transmission speeds, distance, duplex, noise immunity, and frequency characteristics apply and how these properties differ between cable types.

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Category: CompTIA Network+ N10-004

Comments (5)

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  1. Aucado54 says:

    Thank you again.

  2. Terry says:

    Interesting videos. Thanks. Just a point though. I think your Half-duples telephone analogy is flawed. You say that when you’re using a telephone, ‘you’re not able to hear and talk at the same time’, which is quite blatantly incorrect. I would suggest a better analogy with a Half-duplex communication with which people are familiar, would be CB radio, where at any one time, someone can either speak or listen, but not both.

    • I don’t believe my analogy is flawed, although it may be clearer to say that our human brains can’t comprehend any incoming conversations on the telephone when we’re in the middle of saying something.

      In the networking world, the CB radio analogy doesn’t really match what’s going on over the wire. With CB radio, you’re physically turning off the receiver to transmit a signal, and it’s physically impossible to know what’s happening on the frequency while you are talking. In networking, the network adapter’s receiver can tell if there’s changes to the signal while outgoing data is being transmitted, and the network adapter can stop the transmission and back off for a random amount of time.

      • Laurent La Brie says:

        You haven’t met my wife. She can talk and listen at the same time, although how much she hears is up for discussion.

        (-;

        I love your videos. Keep up the great work.

    • Jeff says:

      You are correct. I work as an electronics technician and in my electronics studies many years ago I remember these examples:

      Simplex = AM/FM or TV broadcast (one direction only)
      Half-Duplex = Walkie Talkie (both directions/one at a time)
      Full-Duplex = Telephone (both directions at the same time)

      These are general concepts that apply to all communication techlologies.

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