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How To Test Rj45 Cable Using Cable Tester

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Testing an RJ45 cable is essential to ensure that it is functioning correctly and that it can transmit data reliably. One of the easiest ways to test an RJ45 cable is to use a cable tester. Cable testers can detect any flaws or problems in the cable that could cause network issues. In this article, we will look at how to test an RJ45 cable using a cable tester.

Steps to Test RJ45 Cable Using a Cable Tester

1. Purchase a Cable Tester - There are different types of cable testers available in the market. Typically, a cable tester consists of a remote unit, a master unit, and a display unit. Ensure that the cable tester you purchase is compatible with your RJ45 cable.

2. Plug the Cable Tester to the RJ45 Cable - Attach one end of the RJ45 cable to be tested to the master unit of the cable tester. Connect the other end of the cable to the display unit of the cable tester.

3. Turn on the Cable Tester - Switch on the cable tester and select the appropriate testing mode. Most cable testers have different modes for testing the length of the cable, detecting faults, and other diagnostic functions.

4. Perform the Test - Ensure that the remote unit is disconnected from the master unit. Press the test button on the master unit, and the cable tester will send a signal down the cable to the display unit. Observe the display unit to see the test results.

5. Interpret the Results - Cable testers display the test results on an LCD or LED display. The results may vary depending on the type of cable tester used. Typically, a cable tester will display whether the cable is good or faulty. The tester may also indicate the length of the cable, any shorts, opens, or miswirings detected in the cable.

6. Repair or Replace the Cable - If the tester detects any faults in the cable, repair or replace the cable as needed.


Testing an RJ45 cable is an essential step in ensuring that your network operates correctly. A cable tester simplifies the process of testing a cable and detects faults that could cause issues. By following the above steps, you can test an RJ45 cable using a cable tester effectively. Remember to choose a cable tester that is compatible with your RJ45 cable and carefully interpret the test results to make the necessary repairs or replacements.

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