5-5
Chapter 5: Making Network Connections
10/100BASE-TX Pin Assignments
All 100BASE-TX RJ-45 ports support automatic MDI/MDI-X operation, so you can use
straight-through or crossover cables for all network connections to PCs, switches, or
hubs. In straight-through cable, pins 1, 2, 3, and 6, at one end of the cable, are
connected straight through to pins 1, 2, 3, and 6 at the other end of the cable.
Figure 5-3. RJ-45 Connector
Table 5-3. 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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