SMC Networks 6724L2

T WISTED -P AIR C ABLE AND P IN A SSIGNMENTS
B-3
100BASE-TX/10BASE-T Pin Assignments
With 100BASE-TX/10BASE-T cable, pins 1 and 2 are used for
transmitting data, and pins 3 and 6 for receiving data.
Because all ports on this switch support automatic MDI/MDI-X
operation, you can use straight-through cables for all network
connections to PCs or servers, or to other switches or hubs. In
straight-through cable, pins 1, 2, 3, and 6, at one end of the cable,
are connected straight through to pins 1, 2, 3 and 6 at the other
end of the cable. The table below shows the 10BASE-T/
100BASE-TX MDI and MDI-X port pinouts.
RJ-45 Pin Assignments
Pin Number
Assignment
1
1Tx+
2Tx-
3Rx+
6Rx-
1: The “+” and “-” signs represent the polarity of
the wires that make up each wire pair.
Pin MDI-X Assignment MDI Assignment
1 Input Receive Data + Output Transmit Data +
2 Input Receive Data - Output Transmit Data -
3 Output Transmit Data + Input Receive Data +
6 Output Transmit Data - Input Receive Data -
No other pins are used.