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How To Use A Cable Tester Rj45

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A cable tester is a valuable tool for testing network and Ethernet cables. It allows you to verify whether the cable is properly wired and if it has any defects. This article will focus on how to use a cable tester specifically for RJ45 cables.

Step 1: Gather Materials

Before you can use a cable tester, you will need to have the following materials:

- A cable tester for RJ45 cables

- An RJ45 cable that you want to test

Step 2: Prepare the Cable

The first thing you need to do is prepare the RJ45 cable for testing. To do this, you should cut off a small length of the cable, around 10cm. This will make it easier to manage during the testing process.

Step 3: Connect the Cable to the Tester

Next, connect the RJ45 cable to the cable tester. To do this, you need to insert each end of the cable into the corresponding jacks on the tester. Make sure that the cable is fully inserted, as this will ensure that you get an accurate reading.

Step 4: Turn on the Tester

Once you have connected the cable to the tester, you should turn it on. Most cable testers will have a power button or switch that you can use to do this. Make sure that the tester is fully powered up before you proceed to the next step.

Step 5: Run the Test

Now that everything is set up, you can run the test. This is done using the test button or switch on the tester. When you press this button, the tester will send a signal through the cable and check whether there are any issues. The tester will usually display the results on an LCD screen or with a series of lights.

Step 6: Analyze the Results

Finally, you need to analyze the results of the test. This will tell you whether the cable is properly wired and if there are any defects. Most testers will display the results as a series of pass/fail messages or with specific codes that you can use to identify different issues. If the cable fails the test, you will need to investigate further to determine the cause of the problem.


A cable tester for RJ45 cables is a useful tool to have if you frequently work with Ethernet or network cables. By following the steps outlined in this article, you can ensure that you test your cables effectively and identify any issues quickly. With practice, you can become proficient with using a cable tester and make sure that your network installations are always reliable and secure.

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