Have you ever needed to quickly check a network cable for continuity? Locate which switch port corresponds with a particular wall jack? Wanted something on your keyring that shows your geek status? If you answered "yes" to any of these questions then you need the Ethernet Loopback Jack. The Ethernet Loopty what? It's a small RJ-45 modular plug like you'd find in a wall jack. You can connect one end of a network cable to a switch port and the other end to the loopback jack, and if the RX/TX pairs in the cable are good you'll get a link light on the switch. So, this gives you a quick and easy way to test network cabling.
Ethernet Loopback Jack
