Antaira Technologies - Industrial Media Converters
IMC-C1000-XX Series - Hardware Manual - v1.2
2.6 Ethernet Ports
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RJ45 Ports
RJ45 Ports (Auto MDI/MDI-X): The RJ45 ports are auto-sensing for 10Base-T, 100Base-TX, or 1000Base-T connections.
Auto MDI means that the switch can connect to another switch or workstation without changing the straight-through or
crossover cabling. See the figures below for straight-through and crossover cabling schematics.
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RJ45 Pin Assignments
Crossover Cable
Straight Through Cable
Pin Number / Signal
Pin Number / Signal
Pin Number / Signal
Pin Number / Signal
1 / RX+
3 / TX+
1 / RX+
1 / TX+
2 / RX-
6 / TX-
2 / RX-
2 / TX-
3 / TX+
1 / RX+
3 / TX+
3 / RX+
6 / TX-
2 / RX-
6 / TX-
6 / RX-
Table 2.2 - 10/100Base-T(X) RJ45 Pin Assignments
Crossover Cable
Straight Through Cable
Pin Number / Signal
Pin Number / Signal
Pin Number / Signal
Pin Number / Signal
1 / TP0+
3 / TP1+
1 / TP0+
1 / TP1+
2 / TP0-
6 / TP1-
2 / TP0-
2 / TP1-
3 / TP1+
1 / TP0+
3 / TP1+
3 / TP0+
4 / TP2+
7 / TP3+
4 / TP2+
4 / TP3+
5 / TP2-
8 / TP3-
5 / TP2-
5 / TP3-
6 / TP1-
2 / TP0-
6 / TP1-
6 / TP0-
7 / TP3+
4 / TP2+
7 / TP3+
7 / TP2+
8 / TP3-
5 / TP2-
8 / TP3-
8 / TP2-
Table 2.3 - 1000Base-T RJ45 Pin Assignments
Note: “+” and “-” signs represent the polarity of the wires that make up each wire pair.
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