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Figure 61 Crossover cable
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).
show their pinouts.
Table 33 RJ-45 MDI port pinouts
10BASE-T/100BASE-TX
Pin
Signal
1
Tx+
2
Tx-
3
Rx+
4
Reserved
5
Reserved
6
Rx-
7
Reserved
8
Reserved
Table 34 RJ-45 MDIX port pinouts
10BASE-T/100BASE-TX
Pin
Signal
1
Rx+
2
Rx-
3
Tx+
4
Reserved
5
Reserved
1000BASE-T
Function
Signal
Sends data
BIDA+
Sends data
BIDA-
Receives data
BIDB+
N/A
BIDC+
N/A
BIDC-
Receives data
BIDB-
N/A
BIDD+
N/A
BIDD-
1000BASE-T
Function
Signal
Receives data
BIDB+
Receives data
BIDB-
Sends data
BIDA+
N/A
BIDD+
N/A
BIDD-
59
Table 33
Function
Bi-directional data cable A+
Bi-directional data cable A-
Bi-directional data cable B+
Bi-directional data cable C+
Bi-directional data cable C-
Bi-directional data cable B-
Bi-directional data cable D+
Bi-directional data cable D-
Function
Bi-directional data cable B+
Bi-directional data cable B-
Bi-directional data cable A+
Bi-directional data cable D+
Bi-directional data cable D-
and
Table 34
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