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Network Planning
Accton 3-2 Rule for Class II Repeaters
Between any two PCs or other stations in the same 100BASE-TX collision domain, there may be:
• up to 3 link segments
• up to 2 Class II repeaters (hubs)
Accton 2-1 Rule for Class I Repeaters
Between any two PCs or other stations in the same 100BASE-TX collision domain, there may be:
• up to 2 link segments and
• up to 1 Class I repeater (hub)
Maximum Network Diameter Using Repeaters
Repeater Type and Number
1 Class I
1 Class II
2 Class II
10 Mbps Ethernet Collision Domain
Maximum Ethernet Cable Distance
Cable Type
Twisted Pair, Categories 3, 4, 5
Thin Coax
External Transceiver Drop
Accton 5-4-3 Rule
Between any two PCs or other stations in the same 10 Mbps collision domain, there may be:
• up to 5 link segments in series
• up to 4 repeaters (hubs)
• up to 3 populated cable segments, that is, segments attached to two or more PCs (coax
networks only)*
* The remaining two segments are unpopulated; these are known as inter-repeater links or IRLs.
This distinction between populated and unpopulated segments is significant for coax networks
only.
2-8
Twisted Pair 100BASE-TX
200 m (656 ft)
200 m (656 ft)
205 m (672.4 ft)
Maximum Length
100 m (328 ft)
185 m (607 ft)
50 m (165 ft)
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