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The figure below illustrates how the pins on the RJ-45 connector are
numbered. Be sure to hold the connectors in the same orientation when
attaching the wires to the pins.
10BASE-T/100BASE-TX Pin Assignments
With standard straight-through 10BASE-T/100BASE-TX cable, pins 1 and
2 are used for transmitting data, and pins 3 and 6 for receiving data. The
“+” and “-” signs in the table below are used to represent the polarity of the
wires that make up each wire pair.
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..
Straight-Through RJ-45 Pin Assignments
End 1 End 2
1 (Tx+) 1 (Tx+)
2 (Tx-) 2 (Tx-)
3 (Rx+) 3 (Rx+)
6 (Rx-) 6 (Rx-)