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CSMA/CD

CSMA/CD. Carrier Sense (CS). Computers have the ability to ‘listen’ to a shared communications channel and only transmit when it is free. Multiple Access (MA). This means that many computers can use the same channel without every message smashing into the next. Collision Detection (CD).

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CSMA/CD

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  1. CSMA/CD

  2. Carrier Sense (CS) • Computers have the ability to ‘listen’ to a shared communications channel and only transmit when it is free.

  3. Multiple Access (MA) • This means that many computers can use the same channel without every message smashing into the next.

  4. Collision Detection (CD) • If two messages do collide, the computers ‘hear’ this and back off a random period of time before re-transmitting

  5. CSMA/CD • Collisions are natural on a Bus Topology. • However, if there are too many computers on the network, the number of collisions will go up and the network performance will slow down dramatically.

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