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It's been awhile, but here goes: The 5-4-3 rule is part of the 802.3 spec for Ethernet networks. Origianally written to define timing for end to end signal propagation in a 10Base-5 nework. A station transmitting at one end of the network must be able to detect a collison that occured at the far end of the network before it's timer allows it to transmitt again. The spec says 5 segments of 500 meters sepatated by 4 repeaters (worst case). Under these conditions, adding a 6th segmant would put the network out of spec. If the 5 segments were 50 meters, theoretically the network would functional, but be out of compliance with 802.3's 5-4-3. A more modern day example would be a 10Base-t or 100Base-T network with a backbone hub (Hub1) and 5 uplinked hubs (Hub2-Hub6) Although there are 6 segmants, Station1 (connected to Hub2) and Station2 (connected to Hub6) communication would be in 5-4-3 compliance because it only crosses 3 segments and 3 repeaters. (Hub2--Hub1--Hub6) I know it's quick an dirty, but I hope it helps ...BruceB

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Q: How can a network with 6 segments still comply to the 5-4-3 rule?
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