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How To Use Ethernet Cable Tester

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An Ethernet cable tester is an essential tool that enables users to check the functionality and performance of Ethernet cables. It ensures that the cable's wiring is correct, the signal strength is adequate, and there are no broken connections. This article will provide step-by-step guidance on how to use an Ethernet cable tester.

Step 1: Understanding the Ethernet cable tester

Before using an Ethernet cable tester, it’s essential to understand its features and how they work. The tool comprises two parts, a transmitter, and a receiver. The transmitter sends a signal down the Ethernet cable, and the receiver detects the signal at the other end of the cable. The tester is fitted with LED lights, which indicate the signal strength and the wiring status.

Step 2: Preparing the Ethernet cable for testing

To test an Ethernet cable, all the devices connected to it should be turned off. It’s also recommended to inspect the cable carefully to ensure that there are no damaged wires, broken connectors, or other noticeable defects. If any defects are found, the cable should be repaired or replaced before testing.

Step 3: Connect the Ethernet cable to the tester

Attach the transmitter to one end of the Ethernet cable and plug the receiver to the other end. Ensure that the connectors are securely fastened and tightened to avoid any disruptions during testing.

Step 4: Check the wiring with the Ethernet cable tester

The Ethernet cable tester sends a signal through the cable, checking for any incorrect wiring. The tester will display different LED light patterns, indicating the wiring's condition. If the wiring is correct, all LEDs will light up, and the tester will emit a buzzing sound. If there is incorrect wiring, the LED lights will not light up, or there will be an abnormal light pattern.

Step 5: Test the signal strength

Once the wiring has been checked, the Ethernet cable tester will evaluate the signal strength along the cable’s length. The tester will produce another set of LED signals that indicate signal strength. If the signal strength is good, all the light bulbs used will light up, indicating high-quality results.

Step 6: Record the test results

Finally, after performing the tests, record the test results to track the performance of the Ethernet cable over time. This helps show changes in quality and alerts users if there are any irregularities in performance that may indicate the need for maintenance or replacement.


Ethernet cable testers are valuable tools in evaluating the functional and performance of Ethernet cables. By following the outlined steps above, anyone can use an Ethernet cable tester with ease. Remember that this tool is essential for anyone working in computer networking to ensure the reliability and optimum performance of Ethernet cables.

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