Specifications

Hardware Reference 19
C613-03020-00 REV N
1. The “+” and “-” signs represent the polarity of the wires that make up each wire pair.
If a twisted pair cable is to join two ports and only one of the ports has an
internal crossover, the two pairs must be straight through, as listed in Table 10.
If a twisted pair cable is used to join two ports and either both ports are
labelled with an “X” or neither port is labelled with an “X”, a crossover must be
included in the wiring. Table 11 lists the RJ-45 crossover wiring pin
assignments.
For 1000BASE-T RJ-45 cables, all four pairs are used and the cable is wired in a
straight-through configuration. Table 12 lists the pin assignments.
Table 9: RJ-45 Pin assignments
Pin Number Assignment
1
1TX+
2TX-
3RX+
6RX-
Table 10: RJ-45 Pin assignments, straight through cable
End 1 End 2
1 (TX+) 1 (TX+)
2 (TX-) 2 (TX-)
3 (RX+) 3 (RX+)
6 (RX-) 6 (RX-)
Table 11: RJ-45 Pin assignments, crossover cable
End 1 End 2
1 (TX+) 3 (TX+)
2 (TX-) 6 (TX-)
3 (RX+) 1 (RX+)
6 (RX-) 2 (RX-)
Table 12: Pin assignments, 1000BASE-T RJ-45 cable
End 1 End 2
1 Pair 1+ 1 Pair 1+
2 Pair 1- 2 Pair 1-
3 Pair 2+ 3 Pair 2+
6 Pair 2- 6 Pair 2-
4 Pair 3+ 4 Pair 3+
5 Pair 3- 5 Pair 3-
7 Pair 4+ 7 Pair 4+
8 Pair 4- 8 Pair 4-