SMC Networks SMC7724M/VSW Installation Manual page 65

With 100BASE-TX/10BASE-T cable, pins 1 and 2 are used for
transmitting data, and pins 3 and 6 for receiving data.
RJ-45 Pin Assignments
Pin Number
1
2
3
6
1: The "+" and "-" signs represent the polarity of the
wires that make up each wire pair.
Because the ports on the SMC7724T and SMC7712GT modules 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.
Pin MDI-X Assignment
1 Input Receive Data +
2 Input Receive Data -
3 Output Transmit Data +
6 Output Transmit Data -
No other pins are used.
Note: Auto-negotiation must be enabled for automatic MDI/MDI-X
pinout configuration.
T -P C
WISTED AIR
Assignment
Tx+
Tx-
Rx+
Rx-
P A
ABLE AND IN
1
MDI Assignment
Output Transmit Data +
Output Transmit Data -
Input Receive Data +
Input Receive Data -
SSIGNMENTS
B-3