How to Test an Ethernet Cable

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Check your network cables now to see if they're working properly
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This wikiHow teaches you how to test an Ethernet cable. To test an Ethernet cable, you need a cable tester. There are different models of cable testers you can purchase. Some have a detachable receiver unit that you can use to test a cable across two rooms.

How to Use a Network Cable Tester

Plug one end of your Ethernet cable into the transit jack of a network cable tester. Connect the other end of the cable into the tester's receiver jack. Check the lights on both ends of the tester to ensure they're all lit, and replace the cable if any lights are out.

Steps

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  1. There are many models you can purchase. Make sure it has a battery in it and power it on.
  2. The transmit jack on the tester maybe be labeled "TX".
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  3. Some testers have a detachable receiver you can use to test the cable across different rooms. [1]
  4. Most testers will have 2 sets of 8 LED lights that correspond to the 8 pins on the transmitting and receiving end of the Ethernet cable. There will also be a G light for the ground. It will test each pin one at a time. If all 8 pins light up on both ends, the cable is good. If any of the lights do not light up on either end, this indicates a short in the cable. Don't worry if the G light doesn't light up. If the lights on either end flash out of order, this indicates that you are testing a crossover cable. As long as all 8 lights flash, the cable is good. [2]
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Community Q&A

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  • Question
    If no lights are showing, is my cable tester broken?
    Community Answer
    Yes. Most likely, your tester isn't working.
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  • Question
    Is it possible that when using a tester, the cable checks as good, yet it does not work?
    Bigbigbignthvsd
    Community Answer
    Maybe. It is a possibility. The ethernet cable "could: work, but you never know until you try.
    Thanks! We're glad this was helpful.
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    Not Helpful 0 Helpful 3
  • Question
    I have 8 lights showing but my laptop says "cable not connected", so no signal. What is the issue?
    Community Answer
    Try to reconnect the cable again. Doing this may resolve your issue.
    Thanks! We're glad this was helpful.
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      References

      1. ↑ https://www.youtube.com/watch?v=z_7LKqiWrdk
      2. ↑ https://www.youtube.com/watch?v=7pdJ2aVrMPQ

      About This Article

      Article Summary X

      1. Purchase an Ethernet cable tester.
      2. Plug cable into the transmitter.
      3. Plug the other end of the cable into the receiver.
      4. Check that all 8 lights on the tester light up.

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