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Carrier Sense Multiple Access/Collision Detect

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- Carrier Sense Multiple Access/Collision Detect (CSMA/CD) is the protocol for carrier transmission access in Ethernet networks. On Ethernet, any device can try to send a frame at any time. Each device senses whether the line is idle and therefore available to be used. If it is, the device begins to transmit its first frame. If another device has tried to send at the same time, a collision is said to occur and the frames are discarded. Each device then waits a random amount of time and retries until successful in getting its transmission sent.

CSMA/CD is specified in the IEEE 802.3 standard.

Learn more about Ethernet

100Base-(T) TX/T4/FX - Ethernet: Cabling tips for network professionals, lesson 5: 100Base-(T) TX/T4/FX - Ethernet cable specifications and uses are discussed in this tip.
Gigabit Ethernet and 10 Gigabit Ethernet: Technology overview: This overview of Gigabit Ethernet and 10G lays the foundation for understanding Gigabit Ethernet technology and the advantages it brings to your network.
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FastFacts on Power over Ethernet: Power up on Power over Ethernet with this edition of Networking FastFacts.

CONTRIBUTORS:	Steinar Forshaug and Tom Wade
LAST UPDATED:	16 Apr 2007

Do you have something to add to this definition? Let us know.
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More resources from around the web:

-	See the Ethernet Network Questions and Answers
-	This conceptual overview of Ethernet discusses bandwidth, baseband vs. broadband, and other concepts leading to CSMA/CD.
-	Charles Spurgeon's Ethernet Web Site is a good resource.
-	The IEEE 802.3 standard is available by direct order from the IEEE .
-	Visit SearchNetworking.com for more information on Carrier Sense Multiple Access/Collision Detect.

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