121
Figure 73 Crossover cable
Pin assignments
Select an Ethernet twisted pair cable according to the RJ-45 Ethernet port type on your device. An
RJ-45 Ethernet port can be MDI (for routers and PCs) or MDIX (for switches). For the pinouts of
RJ-45 Ethernet ports, see
Table 84 RJ-45 MDI port 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
—
BIDC+
Bi-directional data cable C+
5
Reserved
—
BIDC-
Bi-directional data cable C
6
Rx-
Receive data
BIDB-
Bi-directional data cable B-
7
Reserved
—
BIDD+
Bi-directional data cable D+
8
Reserved
—
BIDD-
Bi-directional data cable D-
Table 85 RJ-45 MDI-X port 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-
3
Tx+
Send data
BIDA+
Bi-directional data cable A+