Appendix A: Connectors and Connection Media
1000BASE-T/100BASE-TX/10BASE-T Ports
The 1000BASE-T/100BASE-TX/10BASE-T is a port that supports adaptation of three rates, and automatic MDI/MDIX
Crossover at these three rates.
The 1000BASE-T complies with IEEE 802.3ab, and uses the cable of 100-ohm Category-5 or Supper Category-5 UTP or
STP, which can be up to 100 m.
The 1000BASE-T port uses four pairs of wires for transmission, all of which must be connected. Figure A-1 shows the
connections of the twisted pairs used by the 1000BASE-T port.
Figure A-1 Four Twisted Pairs of the 1000BASE-T
Straight-Through
Crossover
Switch Switch
Switch Switch
1 TP0 +
1 TP0 +
1 TP0 + 1 TP0 +
2 TP0 -
2 TP0 -
2 TP0 - 2 TP0 -
3 TP1 +
3 TP1 +
3 TP1 + 3 TP1 +
6 TP1 -
6 TP1 -
6 TP1 - 6 TP1 -
4 TP2 +
4 TP2 +
4 TP2 + 4 TP2 +
5 TP2 -
5 TP2 -
5 TP2 - 5 TP2 -
7 TP3 +
7 TP3 +
7 TP3 + 7 TP3 +
8 TP3 -
8 TP3 -
8 TP3 - 8 TP3 -
In addition to the above cables, the 100BASE-TX/10BASE-T can also use 100-ohm Category-3, 4, 5 cables for 10 Mbps,
and 100-ohm Category-5 cables for 100 Mbps, both of which can be up to 100 m. Figure A-2 shows the pinouts of the
100BASE-TX/10BASE-T.
Figure A-2 Pinouts of the 100BASE-TX/10BASE-T
Pin
Socket
Plug
1
Input Receive Data+
Output Transmit Data+
2
Input Receive Data-
Output Transmit Data-
3
Output Transmit Data+
Input Receive Data+
6
Output Transmit Data-
Input Receive Data-
4, 5, 7, 8
Not Used
Not Used
Figure A-3 shows the straight-through and crossover cable connections for the 100BASE-TX/10BASE-T.
Figure A-3 Connections of the Twisted Pairs of the 100BASE-TX/10BASE-T
