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CSMA/CD protocol is used in ethernet .
it stands for carrier sense multiple access / collision detection.
whenever a collision takes place sending device waits for a specific time (decided by random backoff algorithm) and resents frame.

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Posted by blackmamba

The sender waits for some specific period of time and back off algorithm is used and a jam signal is sent after which communication starts again.

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Posted by sagitraz

When a collision occurs,
• A Jam Signal is sent.
• All hosts briefly stop transmitting.
• All hosts run the backoff algorithm, which decides the random time they will wait before attempting to transmit again.

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Posted by campbell123

wiki.answers.com/Q/What_happens_on_an_ethernet_network_after_a_collision_occurs

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Posted by crouse