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Transition Networks SISPM1040-182D
Technical Support: 1-800-260-1312 International: 00-1-952-941-7600
Appendix A—RJ-45 Pin Assignment
RJ-45 Pin Assignments
The UTP/STP ports will automatically sense for Fast Ethernet (10Base-T/100Base-TX
connections), or Gigabit Ethernet (10Base-T/100Base-TX/1000Base-T connections).
Auto MDI/MDIX means that the switch can connect to another switch or workstation
without changing straight through or crossover cabling. See the figures below for straight
through and crossover cable schematic.
10 /100BASE-TX Pin outs
With10/100BASE-TX cable, pins 1 and 2 are used for transmitting data, and pins 3 and 6
for receiving data.
RJ-45 Pin Assignments
Pin Number Assignment
1 Tx+
2 Tx-
3 Rx+
6 Rx-
[NOTE] “+” and “-” signs represent the polarity of the wires that make up each wire pair.
The table below shows the 10/100BASE-TX MDI and MDI-X port pin outs.
Pin Number MDI-X Signal Name MDI Signal Name
1 Receive Data plus (RD+) Transmit Data plus (TD+)
2 Receive Data minus (RD-) Transmit Data minus (TD-)
3 Transmit Data plus (TD+) Receive Data plus (RD+)
6 Transmit Data minus (TD-) Receive Data minus (RD-)