Half Duplex

Written on 9:36 AM by ooe

• It uses only one wire pair with a digital signal running in both directions on the wire.

• It also uses the CSMA/CD protocol to help prevent collisions and to permit retransmitting if a collision does occur.

• If a hub is attached to a switch, it must operate in half-duplex mode because the end stations must be able to detect collisions.

• Half-duplex Ethernet—typically 10BaseT—is only about 30 to 40 percent efficient because a large 10BaseT network will usually only give you 3 to 4Mbps—at most.

Posted in The OSI Model