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N
P
ETWORK
LANNING
10 Mbps Ethernet Collision Domain
SMC 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.
Maximum Ethernet Cable Distance
Cable Type
Twisted Pair, Categories 3, 4, 5
Thin Coax
External Transceiver Drop
2-8
Maximum Length
100 m (328 ft.)
185 m (607 ft.)
50 m (165 ft.)
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