How would you use a multimeter to determine a wire pair on 100 block in another room?

rpenrirpenri Junior MemberMember Posts: 5 ■□□□□□□□□□
Hi, I've been taking practice tests for the Network+ and I see this question a lot but I haven't the slightest clue as to how this is done.

So the question is: How do you use a multimeter to determine a wire pair running from a jack to the 100 block it's terminated at in another room?

How exactly do you determine which wire is which by using a multimeter? The multimeter tests for voltage and continuity as well as resistance...but wouldn't a toner probe be better?



  • DarrilDarril Registered Member Member Posts: 1,588
    Great first post. You are correct that a toner probe is the correct tool to use. While a multimeter can measure continuity, there's no way to connect the two probes of the multimeter to cable ends in two rooms. However, a toner probe has two elements. One places a tone on one end of the cable. You take the probe to the other room and when you touch it to the cable with the tone, it plays the tone on the speaker. A search on Google of "toner probe" and clicking Images shows several pictures.

    One of the things to look for in quality practice tests is good explanations of why the correct answer is correct, and why the incorrect answers are incorrect. Otherwise, you could end up memorizing bogus information.


    Darril Gibson
    Security+ Blog
    Security+ Tip of the Day
  • rpenrirpenri Junior Member Member Posts: 5 ■□□□□□□□□□
    Thanks, you've confirmed what I was thinking.

    I know that I need to find better practice questions, but there are so many out there that it's hard to know which one is good and which ones aren't. I guess I will have to keep looking.
  • drkatdrkat Senior Member Banned Posts: 703
    the only way this would work is if you're testing for a short or open
  • dead_p00ldead_p00l Senior Member Member Posts: 136
    drkat wrote: »
    the only way this would work is if you're testing for a short or open

    Or if you had a loopback plug to complete the circuit.
    This is our world now... the world of the electron and the switch, the
    beauty of the baud.
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