Network hardware interfaces pinouts
100BASE-T4 is an early implementation of Fast Ethernet. It requires four twisted copper pairs and works with category 3 ethernet cable.
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.

8 pin RJ45 (8P8C) female connector layout
8 pin RJ45 (8P8C) female connector
at the network interface cards/hubs
8 pin RJ45 (8P8C) male connector layout
8 pin RJ45 (8P8C) male connector
at the cables
According to 4 reports in our database (4 positive and 0 negative) this pinout should be correct.

Is this pinout
Ethernet 100Base-T4 visual pinout:
Ethernet 100Base-T4 diagram
click to enlarge
Source(s) of this and additional information: Hardware Book, Kim Scholte
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