![]() ![]() Cut the cat5 cable a few ( 2 or 3 ) inches from the jack.Ģ. I strongly recommend using a cable with a broken or missing jack – after all, we only need one Ethernet jack which is properly wired to a cat5 or higher cable.ġ. In my case, a trip to the store to buy the components I already have at home on ready Ethernet cables seemed wasteful (most people will have a cable or two, or can buy a short cat 5 cable for under 2 dollars). There are lots of guides and video online about creating such an adapter using an Ethernet jack and wires, but this requires having an uncrimped Ethernet jack, some wires, and a crimper. This how-to will use an existing Ethernet cable which will be converted to a Loopback cable. In real life, this can save you hassle quickly testing ADSL modems, routers, switches, desktops and laptops without plugging the device into another jack to get the link light to come on. This is good for testing link connectivity on an Ethernet card – if the adapter can establish a link with itself the hardware on the adapter is probably OK. Ethernet Loopback Adapters are little handy pieces of equipment that route the transmitting pins in an Ethernet jack back to the receiving pins in the same jack. ![]()
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