N
ETWORK
P
LANNING
2-5100 Mbps Fast Ethernet Collision Domain

SMC 3-2 Rule for Class II Repeaters

SMC 2-1 Rule for Class I Repeaters

Maximum 100BASE-TX Network Diameter Using Repeaters

Maximum Fast Ethernet Cable Distance

Between any two PCs or other stations in the same 100BASE-TX
collision domain, there may be:
•up to 3 link segments and
•up to 2 Class II repeaters (hubs)
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)
Repeater Type
and Number
Twisted Pair
100BASE-TX
1 Class I 200 m (656 ft.)
1 Class II 200 m (656 ft.)
2 Class II 205 m (672.4 ft.)
Cable Type Connecting Max. Distance
Twisted Pair Any two devices 100 m (328 ft.)
Fiber Switch to switch, server or PC
Half duplex 412 m (1,351.4 ft.)
Full duplex 2 km (1.24 mi.)