Citation
Khairi, Kharina
(2003)
Design And Evaluation Of A Modified Csma/Cd Mac Protocol On Single-Channel Optical Local Area Network.
Masters thesis, Universiti Putra Malaysia.
Abstract
The project carried out was a study of a single-channel optical Local Area
Network (LAN) based on an improved CSMA/CD protocol that was adapted from the
conventional one. The algorithm of the new version of CSMA/CD was developed, and
the LAN was comprehensively studied from a performance perspective within two
different scenarios, namely, the Fast Ethernet and the Gigabit Ethernet.
The algorithm was developed in Visual Basic 6.0v programming language. This
algorithm paved the way for the generation of performance parameters through
simulation of the new LAN. The parameters were then studied and compared against
corresponding parameters of conventional LAN that are well reported in the literature.
The coding of the new algorithm also incorporated a new type of signal known as
'special jamming signal' that served to stop all nodes from attempting to transmit
except the one whose number of transmission attempts matched the maximum value specified. This resulted in a condition whereby there was no packet loss at all. The
algorithm also focused on providing adequate delay, throughput and efficiency that were
needed to support the existing LAN.
The results of this study showed that at least two significant contributions; the
average delay and the percentage of collisions which were both shown to improve
significantly. Additionally, as far as operating environments were concerned, the
throughput (measured on a percentage scale) of Fast Ethernet performed better than that
of its Gigabit competitor. The difference in their throughput was attributed to the carrier
extension mechanism that was employed by the former. Efficiency, on the other hand,
did not show any difference in both transmission rates.
The summary of the overall performance of our network showed improvement
for all parameters under study: delay, throughput, efficiency and percentage of collisions
by using the improved CSMA/CD protocol.
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