Connectivity Rules
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4
Connectivity Rules
When building your network, please follow the connectivity rules listed below 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
100 Mbps Fast Ethernet Collision Domain
10 Mbps Ethernet Collision Domain
Table 4-1 Maximum 1000BASE-T Gigabit Ethernet Cable Length
Cable Type Maximum Cable Length
Category 5, 5e or better 100-ohm UTP or STP 100 m (328 ft)
Table 4-2 Maximum 1000BASE-SX Fiber Optic Cable Lengths
Fiber Size Fiber Bandwidth Maximum Cable Length
62.5/125 micron 160 MHz/km 2-220 m (7-722 ft)
200 MHz/km 2-275 m (7-902 ft)
50/125 micron 400 MHz/km 2-500 m (7-1641 ft)
500 MHz/km 2-550 m (7-1805 ft)
Table 4-3 Maximum 1000BASE-LX Fiber Optic Cable Length
Fiber Size Fiber Bandwidth Maximum Cable Length
9/125 micron N/A 2 m - 5 km (7 - 16404 ft)
Table 4-4 Maximum Fast Ethernet Cable Lengths
Type Cable Type Max. Cable Length
100BASE-TX Category 5 100-ohm UTP or STP 100 m (328 ft)
100BASE-FX 9/125 micron core single-mode fiber (SMF) for
single-fiber downlink connections
15 km (9.3 miles)
Table 4-5 Maximum Ethernet Cable Length
Cable Type Maximum Length
Categories 3, 4, 5 100-ohm UTP or STP 100 m (328 ft)
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