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Connectivity Rules
4-5
4
Connectivity Rules
When adding hubs (repeaters) to your network, please follow the connectivity rules
listed in the manuals for these products. 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.
1000BASE-T Cable Requirements
All Category 5 UTP cables that are used for 100BASE-TX connections should also
work for 1000BASE-T, providing that all four wire pairs are connected. However, it is
recommended that for all critical connections, or any new cable installations,
Category 5e (enhanced Category 5) or Category 6 cable should be used. The
Category 5e specification includes test parameters that are only recommendations
for Category 5. Therefore, the first step in preparing existing Category 5 cabling for
running 1000BASE-T is a simple test of the cable installation to be sure that it
complies with the IEEE 802.3-2005 standards.
1000 Mbps Gigabit Ethernet Collision Domain
Table 4-1 Maximum 1000BASE-T Gigabit Ethernet Cable Length
Cable Type Maximum Cable Length Connector
Category 5, 5e, 6 100-ohm UTP or STP 100 m (328 ft) RJ-45
Table 4-2 Maximum 1000BASE-SX Fiber Optic Cable Length
Fiber Diameter Fiber Bandwidth Cable Length Range Connector
62.5/125 micron multimode
fiber (MMF)
160 MHz/km 2-220 m (7-722 ft) LC
200 MHz/km 2-275 m (7-902 ft) LC
50/125 micron multimode fiber
(MMF)
400 MHz/km 2-500 m (7-1641 ft) LC
500 MHz/km 2-550 m (7-1805 ft) LC
Table 4-3 Maximum 1000BASE-LX Fiber Optic Cable Length
Fiber Diameter Fiber Bandwidth Cable Length Range Connector
9/125 micron single-mode fiber N/A 2 m - 5 km
(7 ft - 3.2 miles)
LC
Table 4-4 Maximum 1000BASE-ZX Fiber Optic Cable Length
Fiber Diameter Fiber Bandwidth Cable Length Range Connector
9/125 micron single-mode fiber N/A 70* - 100 km
(43.5 - 62.1 miles)
LC
* For link spans exceeding 70 km, you may need to use premium single mode fiber or dispersion
shifted single mode fiber