If the link lights on the other side of the equipment turns on, then your cable isn’t faulty. Simply plug one end of the cable to the adapter and the other end to a switch or router. You can also use the loopback plug to test the Ethernet cable. If it’s active, then most likely, your cable is faulty. If the lights are active, you can check the port on the router’s end and check for connectivity lights. If you’re not able to connect to the internet using your laptop for example, you can plug the loopback plug to the Ethernet port of your laptop to check if it’s faulty. You don’t even need to be a technician to do this. It can help you perform low-level troubleshooting. The Ethernet loopback plug is also a great tool for identifying network issues. You can test the port with a loopback plug small enough, you can slip it into your pockets. If you want to test a port on your router for example, there’s no need to carry a laptop and a cable with you just to check the port. Loopback plug just makes everything easier. If not, then there’s a problem with the port. Just plug it in and check if the link lights are active. The loopback plug is a handy tool for testing network ports on any equipment. When do we use this small-scale networking tool? Here are some cases where the loopback plug proves to be more than useful. Take note however that some switches are equipped with built-in loopback protection so the loopback adapter will not work on such equipment. If the connectivity lights turn on, that means the port is up. You simply have to plug it into a network port on your router, switch, computer, or any networking equipment that you suspect is giving you connection problems. Depending on the type of your network, there are adapters for Fast Ethernet and Gigabit Ethernet.Ī loopback plug is a simple and portable network tool that is very easy to use. There are also loopback plugs that only have the male RJ45 plug and a loopback cable connecting the TX and RX pins, mainly used for testing network ports. The common one is an adapter that has two sides, one has an RJ45 jack, and the other side has an RJ45 plug. The Ethernet loopback plug comes in many forms. In a loopback plug, the TX (Transmit) pair is hooked to the RX (Receive) pins, creating a closed loop and thus transmitting the signal back to the same end. The latest standard, Gigabit Ethernet or 1000BASE-TX, uses all four pairs to transmit data. ![]() In Fast Ethernet, or 100BASE-TX, only two out of four pairs are used. To transmit signals, the Ethernet cable uses pairs of wires. This tool basically takes the output signal as the input signal to test if the connection is working. It is also sometimes referred to as RJ45 adapter, Ethernet loopback adapter, and Ethernet loopback cable. Ethernet Loopback PlugĪn Ethernet loopback plug is a nifty tool that can help you troubleshoot problems with your network connection or to test the Ethernet cables and networking hardware. ![]() Good thing, there is a tiny networking tool we can use for low-level troubleshooting. It is indeed a pain in the neck especially if you’re a lost sheep, not knowing what to do. In critical times though, waiting can be excruciating. It is indeed better to put things in the hands of the experts but at times, it takes a bit longer before they can come and check the problem. When this happens, we normally have to call network technicians to check what’s wrong. Nothing is more annoying than getting a disrupted connection when you’re in the middle of a game, or when you’re about to finish your task, or when you’re reaching the climax of a movie. Connection issues are one of the ordeals we have to face when connected to a network.
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