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 -