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Explain CSMA/CD technique with exponential back-off algorithm.

Mumbai university > Electronics and telecommunication Engineering > Sem 6 > Computer Communication and Telecom Network

Marks: 05

Years: Dec 2016

1 Answer
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• Figure shows a flow chart for the CSMA/CD (Carrier Sense Multiple Access/Collision Detection) protocol.

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• The station that has a ready frame sets the back off parameter to zero.

• Then it senses the line using one of the persistent strategies.

• It then sends the frame. If there is no collision for a period corresponding to one complete frame, then the transmission is successful.

• Otherwise the station sends the jam signal to inform the other stations about the collisions.

• The station then increments the back off time and waits for a random back off time and sends the frame again.

• If the back off has reached its limit then the station aborts the transmission.

• CSMA/CD is used for the traditional Ethernet.

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