Schematics for both straight and crossover twisted-pair
cable are shown below.
Straight-Through Cross-Over / Swap
Switch Adapter Switch Hub
1 RD + 1 TD + 1 RD + 1 RD +
2 RD - 2 TD - 2 RD - 2 RD -
3 TD + 3 RD + 3 TD + 3 TD +
6 TD - 6 RD - 6 TD - 6 TD -