Short for Carrier
Sense Multiple Access / Collision
Detection, a set of rules determining how network devices respond when two
devices attempt to use a data channel simultaneously (called a collision).
Standard Ethernet networks use CSMA/CD to physically monitor the traffic on the
line at participating stations.
1.If no transmission is taking
place at the time, the particular station can transmit. If not then it
will wait...
2.If
two stations attempt to transmit simultaneously, this causes a collision, which
is detected by all participating stations. After a random time interval, the
stations that collided attempt to transmit again. If another collision occurs,
the time intervals from which the random waiting time is selected are increased
step by step. This is known as exponential back off.
CSMA/CD is a type
of contention protocol. Networks using the CSMA/CD procedure are
simple to implement but do not have deterministic transmission characteristics.
The CSMA/CD method is internationally standardized in IEEE 802.3 and ISO
8802.3.
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