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Algorithm for CSMA and Rules for CSMA/CD
  • Difficulty Level : Hard
  • Last Updated : 23 Dec, 2019

Rules for CSMA/CD:

  1. If medium is idle, transmit, otherwise go to 2
  2. If the medium is busy, continue to listen until the channel is idle, then transmit immediately
  3. If collision is detected during transmission then transmit a brief jamming signal to assure that all station knows that there has been a collision so that stations can cease the transmission
  4. After transmitting the jamminnig signal wait for a random amount of time reffered as back off then attemps transmit Again

Algorithm For CSMA:
Algorithm for CSMA are: Non-Persistant, 1-Persistant, and 2-Persistant. These are explained as following below.

(a) Non-Persistant CSMA:
If channel is not free then wait for random amount of time then sense the channel, if free then sends the data

  1. Transmit if medium is idle otherwise go to 2
  2. Wait for random amount of time and repeat (1) if medium is busy

(b) 1-Persistant CSMA:
Continuously sense the channel and when it sense that the channel is free, it transmit the data.

  1. If medium is idle transmit, otherwise go to 2
  2. Wait for random amount of time and repeat (1) if medium is busy

(c) 2-Persistant CSMA:
Sense the channel before sending the data.

  1. With probability “P”, the station sends its frame
  2. With probability 1-P, station waits for the beginning of the next time slot and check the line again:
    • (i) If line is idle go to 1
    • (ii) If line is busy, it act as a collision has occur ed and uses the backoff algorithm

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