|You cannot tell a crossover cable just by looking at it unless they have transparent plugs and you are familiar with the wiring of Cat5 cable. A cable labeled as a patch cord is probably not a crossover cable.|
A crossover cable is one where the plug at one end is wired slightly different. Some of the pins are swapped over , pins 1- to 2 and 2 to 1, etc. instead of 1 to 1 and 2 to 2. You can buy a suitable cable from most computer stores.