3Com 3CR17251-91 - Switch 5500G-EI Stackable Gigabit Ethernet Getting Started Manual page 125

Table 11 Pin assignments
Pin Number
Ports configured as MDIX
1
2
3
4
5
6
7
8
Ethernet Port RJ-45 Pin Assignments
10/100
Receive Data +
Receive Data -
Transmit Data +
Not assigned
Not assigned
Transmit Data –
Not assigned
Not assigned
1000
Bidirectional Data B+
Bidirectional Data B-
Bidirectional Data A+
Bidirectional Data A-
Bidirectional Data D+
Bidirectional Data D-
Bidirectional Data C+
Bidirectional Data C-
125