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3-15
Table 3-2
RJ-45 MDI interface pinouts
10Base-T/100Base-TX
1000Base-T
Pin
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-
Tx = Transmit data
Rx = Receive data
BI = Bi-directional data
Table 3-3
RJ-45 MDI-X interface pinouts
10Base-T/100Base-TX
1000Base-T
Pin
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+
4 Reserved
—
BIDD+
Bi-directional data cable D+
5 Reserved
—
BIDD-
Bi-directional data cable D-
6 Tx- Send
data
BIDA-
Bi-directional data cable A-
7 Reserved
—
BIDC+
Bi-directional data cable C+
8 Reserved
—
BIDC-
Bi-directional data cable C-
Pins 1 and 2 (negative), 3 and 6 (positive) are used for external PoE power supply.