Foundry Networks OSI Manuale Utente
N
ETWORK
P
LANNING
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.
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)