100Base-T4 uses all four pairs. 100Base-TX only uses two pairs.
(at the network interface
cards/hubs)
(at the cables)
RJ45 FEMALE CONNECTOR at the network interface cards/hubs.
RJ45 MALE
CONNECTOR at the cables.
| 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.