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CITS3002 Computer Networks |
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Persistent CSMA ProtocolsUsing 1-persistent CSMA protocols, each station first senses the activity on the channel. If two stations A and B are waiting for C to finish, they just pause for a period, and when they sense that the channel is free, transmit with a probability of 1 (pretty persistent eh?). This, naturally, results in a good chance of a collision.
 The longer a propagation delay on a LAN the more collisions there will be and, hence, the worse will be the performance. 1-persistence is no good for satellite broadcasting because :
each station hears what was happening at least 270msec ago!
CITS3002 Computer Networks, Lecture 4, Local Area Networks (LANs and WLANs), p8, 20th March 2024.
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