IBM AT-FS202SC/FS3 - Manual (Page 33)

AT-FS20x Series Installation Guide
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Table 12 lists the 10Base-T/100Base-TX connector pins and their signals
when the port is operating in either MDI or MDI-X configuration.
Table 12 RJ-45 Pinouts
MDI-X (Default) Signal MDI Signal
1 RX+ 1 TX+
2 RX- 2 TX-
3 TX+ 3 RX+
4 - 4 -
5 - 5 -
6 TX- 6 RX-
7 - 7 -
8 - 8 -