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100 Mbps Fast Ethernet Collision Domain
SMC 3 - 2 Rule for Class
II
Repeaters
SMC 2 - 1 Rule for Class I and Class II Repeaters
Maximum 100BASE-T Network Diameter*
Maximum 100BASE-T Cable Distance
INSTALLING
4-10
Between any two PCs or other stations in the same
100BASE-T 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-T collision domain, there may be:
• up to 2 link segments and
• up to 1 Class I or Class II repeater (hub)
Repeater Type Twisted Pair Twisted Pair/Fiber
and Number 100BASE-TX/T4 100BASE-T4/FX 100BASE-TX/FX
1 Class I 200 m (656 ft.) 231 m (757.7 ft.) 260.8 m (855.4ft.)
1 Class II 200 m (656 ft.) 304 m (997.1 ft.) 308.8 m (1012.9 ft.)
2 Class II 205 m (672.4 ft.) 236.3 m (775.1 ft.) 216.2 m (709.1 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.)
MII Any two devices 0.5 m (1.6 ft.)
*Note: Network Diameter is defined as the wire distance between two end stations in
the same collision domain.