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N
P
ETWORK
LANNING
10 Mbps Ethernet Collision Domain
Maximum Ethernet Cable Distance
Cable Type
Twisted Pair, Categories 3, 4, 5
Thin Coax
External Transceiver Drop
Maximum Network Diameter Using Repeaters
Repeater Type
and Number
1 Class I
1 Class II
2 Class II
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.
2-8
Maximum Length
100 m (328 ft)
185 m (607 ft)
50 m (165 ft)
Twisted Pair
100BASE-TX
200 m (656 ft)
200 m (656 ft)
205 m (672.4 ft)
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