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| Cables and Pinouts
Twisted-Pair Cable Assignments
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If the twisted-pair cable is to join two ports and only one of the ports has
an internal crossover (MDI-X), the two pairs of wires must be straight-
through.
Figure 60: Straight Through Wiring
Table 7: 10/100BASE-TX MDI and MDI-X Port Pinouts
PIN
MDI Signal Name
a
a.
The
+
and
-
signs represent the polarity of the wires that make up each wire pair.
MDI-X Signal Name
1
Transmit Data plus (TD+)
Receive Data plus (RD+)
2
Transmit Data minus (TD-)
Receive Data minus (RD-)
3
Receive Data plus (RD+)
Transmit Data plus (TD+)
6
Receive Data minus (RD-)
Transmit Data minus (TD-)
4, 5, 7, 8
Not used
Not used
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