Lecture #14: Local Area Networks ALOHA Ethernet Token Ring ...
Lecture #14: Local Area Networks ALOHA Ethernet Token Ring ...
Lecture #14: Local Area Networks ALOHA Ethernet Token Ring ...
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Pure <strong>ALOHA</strong> (3)<br />
�� Whenever two frames try to occupy the channel at the<br />
same time, there will be a collision and both will be<br />
garbled. Both will have to be retransmitted later.<br />
�� The checksum cannot (and should not) distinguish<br />
between a total loss and a near miss. miss<br />
�� The maximum throughput occurs at G (load-attempts<br />
(load attempts<br />
per packet time) = 0.5, with S (the throughput) =<br />
1/2e, which is about 0.184. In other words, the best<br />
we can hope for is a channel utilization of 18 percent.<br />
This result is not very encouraging<br />
10
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