Cat-5 RJ45 standard and crossover pinouts.

These are the pinouts for RJ-45 standard and various crossover plugs. Use the standard pinout on both ends if a staight cable is required, for a crossover use the standard on one end and a crossover on the other. Use the LAN crossover pinouts if you're connecting two computers or two hubs together. If connecting two T1 modems back to back use the T1 crossover pinouts. If connecting two DDS 4 Wire modems back to back use the DDS 4Wire crossover pinouts.