3Com 3CR17561-91-US - Switch 4500 26PORT Managed 24 10/100 2 Gbe Stackable RJ45 Getting Started Manual - page 113
Manual is about: Getting Started Guide
of
128
Ethernet Port RJ-45 Pin Assignments
113
Table 11 Pin assignments
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 A-
5
Not assigned
Bidirectional Data D+
6
Transmit Data –
Bidirectional Data D-
7
Not assigned
Bidirectional Data C+
8
Not assigned
Bidirectional Data C-