N
ETWORK
P
LANNING
2-6
100 Mbps Fast Ethernet Collision Domain
SMC 3-2 Rule for Class II Repeaters
SMC 2-1 Rule for Class I Repeaters
Maximum Network Diameter Using Repeaters
Type Cable Type Max. Cable Length
100BASE-TX Category 5 100-ohm UTP or STP 100 m (328 ft)
100BASE-FX
Multimode
50/125 or 62.5/125 micron core
multimode fiber (MMF)
2 km (1.24 miles)
100BASE-FX
Single-Mode
9/125 micron core single-mode
fiber (SMF)
20 km (12.43 miles)
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)
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