Ethernet 100Base-T4

pinout

100Base-T4 uses all four pairs. 100Base-TX only uses two pairs

8 pin RJ45 female connector  at the network interface cards/hubs

Pin Name Description 1 TX_D1+ Tranceive Data+ 2 TX_D1- Tranceive Data- 3 RX_D2+ Receive Data+ 4 BI_D3+ Bi-directional Data+ 5 BI_D3- Bi-directional Data- 6 RX_D2- Receive Data- 7 BI_D4+ Bi-directional Data+ 8 BI_D4- Bi-directional Data- Note: TX & RX are swapped on Hub´s. Don´t know about Bi-directional data

8 pin RJ45 male connector  at the cables

Source:www.pinouts.ru