How is packet collision avoided in full duplex mode?

Full-duplex mode makes use of two physical pairs of twisted cable where one pair is used for receiving data packets and the other pair for sending packets. This way the cable itself represents a collision-free carrier.

It also doubles the maximum data volume that can be supported by the connection. Other advantages are that no time is wasted because no packets need to be retransmitted and the circumstance that nodes don't have to wait until others complete their transmission, since there is only one transmitter for each twisted pair.

Because it is full duplex mode? Did yo uever check the wiring on normal ethernet cables? Like it uses 4 wires, in 2 separated circuits - so the Switch and the network card SEND and RECEIVE over DIFFERENT WIRES.

There simply is no chance for collission.