Lets use a straight through cable:
1 transmit +
2 transmit -
3 receive +
6 receive -
So obviously transmit means that data is being sent and receiving means that data is being received.
So why are two transmit wires needed and two receive wires needed?
Also, if the Cat5e straight through cable is wired such that wires 1 & 2 are transmitting
and 3 & 6 are receiving, does this means that Ethernet switchports are configured like so:
1 receive +
2 receive -
3 transmit +
6 transmit -
I might have my + and - symbols in the wrong location on the second set of wires, because I'm not sure what they represent.