The Networx® T1/E1 Crossover Adapter allows you to convert a classic patch cable into a crossover adapter for various purposes. Networx® gives you the T1/E1 Crossover adapter at the greatest price possible. The Networx® T1/E1 Crossover adapter is an extremely easy to use cable adapter. This compact loopback adapter is probably the quickest and most painless way to convert a standard patch cable into a crossover cable. All you have to do is plug the patch cable into the Networx® T1/E1 crossover adapter and then insert the adapter into the destination device, be it a router or a switch. This crossover adapter is a must have for every network technician as it totally eliminates the need to carry hefty cables around. The Networx® T1/E1 Crossover adapter comes with a small sturdy chain to use with a key ring or utility bag, making portability, an easy option.