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Describe Ethernet signal limitations associated with the so-called '5-4-3' rule.
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# Ethernet Signal Limitations: The 5-4-3 Rule Show more…
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Suppose the round-trip propagation delay for Ethernet is $46.4 \mu \mathrm{s}$. This yields a minimum packet size of 512 bits ( 464 bits corresponding to propagation delay $+$ 48 bits of jam signal). (a) What happens to the minimum packet size if the delay time is held constant, and the signalling rate rises to $100 \mathrm{Mbps}$ ? (b) What are the drawbacks to so large a minimum packet size? (c) If compatibility were not an issue, how might the specifications be written so as to permit a smaller minimum packet size?
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