4
Figure 4 Crossover cable
Pin assignments
Select an Ethernet twisted pair cable according to the RJ-45 Ethernet interface type on your device.
An RJ-45 Ethernet interface can be MDI (for routers and PCs) or MDIX (for switches). For the pinouts
of RJ-45 Ethernet interfaces, see
and
Table 3 RJ-45 MDI interface pinouts
Pin
10BASE-T/100BASE-TX
1000BASE-T
Signal
Function
Signal
Function
1
Tx+
Send data
BIDA+
Bi-directional data cable A+
2
Tx-
Send data
BIDA-
Bi-directional data cable A-
3
Rx+
Receive data
BIDB+
Bi-directional data cable B+
4
Reserved
N/A
BIDC+
Bi-directional data cable C+
5
Reserved
N/A
BIDC-
Bi-directional data cable C-
6
Rx-
Receive data
BIDB-
Bi-directional data cable B-
7
Reserved
N/A
BIDD+
Bi-directional data cable D+
8
Reserved
N/A
BIDD-
Bi-directional data cable D-
Table 4 RJ-45 MDI-X interface pinouts
Pin
10BASE-T/100BASE-TX
1000BASE-T
Signal
Function
Signal
Function
1
Rx+
Receive data
BIDB+
Bi-directional data cable B+
2
Rx-
Receive data
BIDB-
Bi-directional data cable B-
Crossover cable
white/orange
orange
white/green
green
white/orange
orange
white/green
blue
white/blue
green
white/brown
brown
1
2
3
4
5
6
7
8
blue
white/blue
white/brown
brown
1
2
3
4
5
6
7
8
