Half-duplex Ethernet is defined in the original 802.3 Ehternet; cisco says it uses only one wire pair with a digital signal running in both direction on the wire.
Half-duplex Ethernet-typically 10 BaseT- is only about 30 to 40 percent efficient as cisco sees it because a large 10 Base T network will usually only give you 3 to 4 Mbps at most.
Full Duplex Ehternet is supposed to offer 100 percent efficiency in both directions.
Full-duplex Ethernet can be used in three situtions:-
- With a connection from a switch to a host.
- With a connection from a switch to a switch.
- With a connection from a host to a host using a crossover cable.