Total Access 238 Command Line Interface Guide
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61200630L1-35C
Half-duplex Ethernet is the traditional form of Ethernet that employs the Carrier Sense
Multiple Access/Collision Detect (CSMA/CD) protocol to allow two or more hosts to share a
common transmission medium while providing mechanisms to avoid collisions. A host on a
half-duplex link must “listen” on the link and only transmit when there is an idle period.
Packets transmitted on the link are broadcast (so it will be “heard” by all hosts on the
network). In the event of a collision (two hosts transmitting at once), a message is sent to
inform all hosts of the collision and a backoff algorithm is implemented. The backoff algorithm
requires the station to remain silent for a random period of time before attempting another
transmission. This sequence is repeated until a successful data transmission occurs.
The 10Base-T, 100Base-TX, and 100Base-FX signalling systems support full-duplex operation
because they have transmit and receive signal paths that can be simultaneously active.
Usage Examples
Configure the Ethernet interface for full-duplex operation.
TA238(config-eth 0)#duplex full
Configure the Ethernet interface for half-duplex operation.
TA238(config-eth 1)#duplex half
