SMC Networks SMC8624T manual Connectivity Rules, Mbps Gigabit Ethernet Collision Domain

NETWORK PLANNING

Connectivity Rules

When adding hubs (repeaters) to 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

Maximum 1000BASE-T Gigabit Ethernet Cable Length

Cable Type			Maximum Cable Length
Category 5, 5e 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		160 MHz/km			2-220 m (7-722 ft.)
multimode fiber (MMF)
		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	N/A			2 m - 5 km (7-16,404 ft)
fiber (SMF)

Note: Although maximum cable length for 100BASE-FX fiber depends on the duplex mode, the maximum length for 1000BASE-X fiber is the same for both half and full duplex.

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