100BASE-T4 is an early implementation of Fast Ethernet.
Pin | Name | Description |
---|---|---|
1 | TX_D1+ | Transmit Data+ |
2 | TX_D1- | Transmit 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- |
One pair is reserved for transmit, one for receive, and the remaining two will switch direction as negotiated.
Note: TX & RX are swapped on Hub´s. Don´t know about Bi-directional data