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3-6 © 2003 Foundry Networks, Inc. February 2003
Connectivity Rules
When adding hubs (repeaters) to your network, please follow the standard
connectivity rules for Ethernet, Fast Ethernet, and Gigabit Ethernet.
However, note that because switches break up the path for connected
devices into separate collision domains, you should not include the switch
or connected cabling in your calculations for cascade length involving
other devices.
1000 Mbps Gigabit Ethernet Collision Domain
Maximum 1000BASE-T Gigabit Ethernet Cable Length
Cable Type Maximum Cable Length
Category 5, 5e, or 6 100-ohm UTP or STP 100 m (328 ft)
Maximum 1000BASE-SX Fiber Optic Cable Distance
Fiber Diameter Fiber Bandwidth Cable Length Range
62.5/125 micron
multimode fiber (MMF)
160 MHz/km 2-220 m (7-722 ft.)
200 MHz/km 2-275 m (7-902 ft.)
50/125 micron MMF 400 MHz/km 2-500 m (7-1641 ft.)
500 MHz/km 2-550 m (7-1805 ft.)
Maximum 1000BASE-LX Fiber Optic Cable Distance
Fiber Diameter Fiber Bandwidth Cable Length Range
9/125 micron single-mode
fiber (SMF)
N/A 2 m - 5 km (7-16,404 ft)