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CSMA/CD
Last modified: Monday, February 28, 2005 

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. If no transmission is taking place at the time, the particular station can transmit. 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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For internet.com pages about CSMA/CD . Also check out the following links!

Related Links

Ethernet and CSMA/CD
This article describes how and why CSMA/CD works on an Ethernet network, and how it can fail.

Introduction to CSMA/CD
Contains a historical overview of CSMA/CD.

related categories

Ethernet

Networks

related terms

100Base-T

802.11

collision

collision detection

collision domain

contention

Ethernet

packet collision

packet collision rate


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