You can get a crossover cable at Staples but as said before, if the green and yellow lights on the jack are lighting up, then you don't need one. Newer computers or rather, newer Ethernet ports, have auto-negotiate cpaabilities where they can assign the transmit and receive pairs along with the speed of the connection. The ETD does not have this capability so if the PC doesn't either, then a cross over cable would be required. The easiest way to see that is if nothing lights up whn you plug the ETD into the PC.