3com 2250-SFP User Manual
Ethernet Port RJ-45 Pin Assignments
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Ethernet Port RJ-45 Pin Assignments
Table 2 RJ-45 MDI Pin Assignments
Table 3 RJ-45 MDIX Pin Assignments
Pin Number
10/100
1000
Ports configured as MDI
1
Transmit Data +
Bidirectional Data A+
2
Transmit Data -
Bidirectional Data A-
3
Receive Data +
Bidirectional Data B+
4
Not assigned
Bidirectional Data C+
5
Not assigned
Bidirectional Data C-
6
Receive Data –
Bidirectional Data B-
7
Not assigned
Bidirectional Data D+
8
Not assigned
Bidirectional Data D-
Pin Number
10/100
1000
Ports configured as MDIX
1
Receive Data +
Bidirectional Data B+
2
Receive Data -
Bidirectional Data B-
3
Transmit Data +
Bidirectional Data A+
4
Not assigned
Bidirectional Data D+
5
Not assigned
Bidirectional Data D-
6
Transmit Data -
Bidirectional Data A-
7
Not assigned
Bidirectional Data C+
8
Not assigned
Bidirectional Data C-