C
ONNECTIVITY
R
ULES
2-7
10 Mbps Ethernet Collision Domain
SMC 5-4-3 Rule
Maximum Ethernet Cable Distance
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.
Cable Type Maximum Length
Twisted Pair, Categories 3, 4, 5 100 m (328 ft)
Thin Coax 185 m (607 ft)
External Transceiver Drop 50 m (165 ft)
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