June 30, 2006 Chapter 2: Installation
SG1-UM-8500-03 2-3
Table 2-1. RJ-45 Pin-Outs
Figure 2-1 shows the pin-outs for straight-through and cross-connect cabling.
Figure 2-1. Straight-Through and Cross-Over Cable Pin-Outs
MDI Pin Number MDI-X Pin Number Signala
a.NC = no connection.
Symbol Direction
1 3 Transmit Data (+) TX+ (TX0+) Out(Bidirect)
2 6 Transmit Data (-) TX-(TX0-) Out(Bidirect)
3 1 Receive Data (+) RX+(TX1+) In(Bidirect)
4 4 NC (TX2+) (Bidirect)
5 5 NC (TX2-) (Bidirect)
6 2 Receive Data (-) RX-(TX1-) In(Bidirect)
7 7 NC (TX3-) (Bidirect)
8 8 NC (TX3+) (Bidirect)
case case Chassis Ground
Cable jack
Cable jack
Cable jack
Cable jack
Receive
ReceiveTransmit
Transmit Transmit
Transmit
Straight-through cable
Cross-over cable
3
6
3
6
3
6
3
6
1
2
1
2
1
2
1
2
MDI-X port
(data network device)
MDI port
(data network device)
MDI port
(management card)
MDI port
(management card)
3
6
1
2
3
6
1
2
3
6
1
2
3
6
1
2
Receive Receive