Networx® T1 / E1 / PRI Crossover Adapter - RJ45 Male to Female - Converts Ethernet Patch Cable to Telecom Crossover - for Router Labs and Legacy Muxes

worked flawlessly. I was instructed to build a cord, but didn't want to take a chance. This was cheap insurance it was done right. Keep one in your arsenal.

This made life so much easier. Dont have to make them anymore and wont lose this one.

Works fine.

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!

Item description says "All you have to do is simply plug the Networx(tm) Gigabit RJ45 loopback tester into the jack that you want to test or the one you are suspicious about. If the link LED on your switch is active, then that means that the connection is operating perfectly." That is what I did. Was looking forward to plug it into wall jacks around my house, go to my 24-port house switch, and see which port serves that wall jack because the original installers left them unlabeled on the switch. Nope. No port lit up. When I plug in a laptop or something, the switch ports light up. So, the wall jacks I tried actually do work, but this little gizmo didn't. I tried the other way, too. Just unplugged a cable from the amp next to the switch, getting fed from the switch, and plugged that cable to the female end of this tool, hoping to see the port light up at the end of the 3ft cable. Nope. That didn't work either. Both of these cases I would have expected to work, and was SOOOOOO looking forward to it working. Now I have to go around the house plugging/unplugging actual devices and trace actual bundles of spagetti cables to see what is plugged in each of the 24 ports. Yuck.

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.

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 AWESOME AND VERY TIME EFFICIENT.