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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
Table 48 RJ-45 MDI interface pinouts
Pin
1
2
3
4
5
6
7
8
Table 49 RJ-45 MDI-X interface pinouts
Pin
1
2
3
4
5
6
7
8
To ensure normal communication, the pins for sending data on one port should correspond to the pins for
receiving data on the peer port. When both of the ports on the two devices are MDI or MDIX, a crossover
Ethernet cable is needed. A cross-over cable connects devices of the same type. When one port is MDI
and the other is MDIX, a straight-through Ethernet cable is needed. A straight-through cable connects
devices of different types.
If an RJ-45 Ethernet interface with MDI/MDIX autosensing enabled can automatically negotiate pin roles.
The 1 1900 RJ-45 Ethernet interfaces support MDI/MDIX. By default, MDI/MDIX is enabled on a port.
Making an Ethernet twisted pair cable
To make an Ethernet twisted pair cable:
Table 48
and
10Base-T/100Base-TX
Signal
Function
Tx+
Send data
Tx-
Send data
Rx+
Receive data
Reserved
N/A
Reserved
N/A
Rx-
Receive data
Reserved
N/A
Reserved
N/A
10Base-T/100Base-TX
Signal
Function
Rx+
Receive data
Rx-
Receive data
Tx+
Send data
Reserved
N/A
Reserved
N/A
Tx-
Send data
Reserved
N/A
Reserved
N/A
Table
49.
1000Base-T
Signal
BIDA+
BIDA-
BIDB+
BIDC+
BIDC-
BIDB-
BIDD+
BIDD-
1000Base-T
Signal
BIDB+
BIDB-
BIDA+
BIDD+
BIDD-
BIDA-
BIDC+
BIDC-
81
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-
Bi-directional data cable A-
Bi-directional data cable C+
Bi-directional data cable C-
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Troubleshooting
