Specifications

16 AT-8600 Series
C613-03080-00 REV E
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 5
on page 16.
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 6 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 7 lists the pin assignments.
Table 5: 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 6: 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 7: 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-