Compares the two common MAC protocols, CSMA/CD and DCF (CSMA/CA) using simulation.

- Each node generates data packets according to a Poisson process with rate λ.
- No transmission errors.
- For DCF, propagation time is assumed to be the same for all pairs of nodes; when a node begins to transmit, some times later all the other nodes know it at the same time. This is not true for CSMA/CD, for which each node is equally spaced on the bus and propagation times for each pair of nodes are proportional to their distance.

MAC: | |
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octets | |

bps | |

μs | |

μs | |

bits | |

μs | |

μs | |

μs | |

μs (= SIFS + 2 × SlotTime) |

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Animation frame rate:
FPS

Simulation speed:
/s

Tip: Click a node to generate a packet independently of the random processes.

Independent variable:

From to increasing by

Take results at seconds

Number of nodes | Packet arrival rate (pkts/s) | Throughput (pkts/s) | Mean packet delay (ms) | Collision probability | Packet drop rate 1 | Packet drop rate 2 |
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