Testing an Ethernet Cable: 4 Steps (with Pictures)

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Testing an Ethernet Cable: 4 Steps (with Pictures)
Testing an Ethernet Cable: 4 Steps (with Pictures)
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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 several models of cable testers that you can buy. Some have a detachable receiver that you can use to test a cable between two rooms.

Steps

Test an Ethernet Cable Step 1

Step 1. Buy an Ethernet cable tester

There are many models you can buy. Make sure it has a battery and turn on the cable tester.

Test an Ethernet Cable Step 2

Step 2. Plug one end of the cable into the transmit jack

The transmit terminal on the tester may be labeled 'TX'.

Test an Ethernet Cable Step 3

Step 3. Plug the other end of the cable into the receiver connector

The receiver connector may be labeled "RX" on the device. Some testers have a detachable receiver that you can use to test the cable between different rooms.

Test an Ethernet Cable Step 4

Step 4. Check the lights on the tester

Most testers have 2 sets of 8 LEDs that correspond to the 8 pins on the transmit and receive ends of the Ethernet cable. There will also be a G-lamp that measures if the cable is properly grounded. The tester will test each pin one by one. If all 8 pins light up on both ends, the cable is good. If one of the lights on either end does not light up, there is a short circuit in the cable. Don't worry if the G light doesn't light up. If the lights on both ends flash alternately, it means you are testing a crossover cable. As long as all 8 lights are flashing, the cable is good.

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