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Appendix A
A.1 Switch’s RJ-45 Pin Assignments
When connecting your Desktop Fast Ethernet Switch to another switch,
a bridge or a hub, a straight or crossover cable is necessary. Each port
of the Switch supports auto-MDI/MDI-X detection. That means you can
directly connect the Switch to any Ethernet devices without making a
crossover cable. The following table and diagram show the standard RJ-
45 receptacle/ connector and their pin assignments:
RJ-45 Connector pin assignment
Contact
MDI
Media Dependant Interface
MDI-X
Media Dependant
Interface - Cross
1
Tx + (transmit)
RX + (receive)
2
Tx - (transmit)
RX - (receive)
3
Rx + (receive)
TX + (transmit)
4, 5
Not used
6
RX – (receive)
TX – (transmit)
7, 8
Not used
The standard cable, RJ-45 pin assignment
A.2 RJ-45 Plug, Jack pin out
The standard RJ-45 receptacle/.connector
There are 8 wires on a standard UTP/STP cable and each wire is color-
