Networx® Fast Ethernet Crossover Adapter (Cat5e) - RJ45 Male to Female - 10/100Base-T Crossover for Legacy Devices

It's basic, but it's necessary, and it works VERY well. Can't tell what switchport a wall port goes to? Throw on loopback detection on every port, plug this thing in, BOOM! Port identified! WAY easier than toning out cables!

Very Good product and works as it it intended for. Just make sure you get the right one for the job. The Gig loopback is different from the RJ45. Although technically both are RJ45 structure, the internal wiring is different. These loopback are great for Analyst remoting-in and conducting their own company proprietary test on their machines.

Many older devices without auto-negotiation of RX-TX pin positions need a crossover cable rather than a common straight-through cable. This makes it easy to swap without needing a separate crossover cable.

Works fine.

simply didn't work.

Having a reliable way to quickly to check for a port failure is a must. Doing a quick loopback test is a fast, easy way to check a port. I like the design of this device because all of the wires are tucked inside the body.

Nice network diagnostic tool.

I got no use out of this. I won't give it a bad review just for that, but it could be more clear as to what it does. I wanted to use it to test my home data jacks, but I guess it's really only made to test cables? I still don't get it.

Despite the warnings from other buyers and the fact that it is made in China, I bought the device. Unsurprisingly it did not work. A refund is on the way. Hopefully that will work as it is made in the USA!

Perfect piece of kit for any data / network installer