SMC Networks 100 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, or 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 Optic Cable Distance

1000BASE-T Cat. 5, 5e 100-ohm UTP 100 m (328 ft)

RJ-45

Maximum 1000BASE-SX Fiber Optic Cable Distance

Fiber Size	Fiber Bandwidth	Maximum Cable Length
62.5/125 micron	160 MHz/km	7-722 ft. (2-220 m)
MMF
	200 MHz/km	7-902 ft. (2-275 m)
50/125 micron	400 MHz/km	7-1641 ft. (2-500 m)
MMF
	500 MHz/km	7-1805 ft. (2-550 m)

Maximum 1000BASE-LX Fiber Optic Cable Distance

1000BASE-LX Fiber Specifications

Fiber Diameter	Fiber Bandwidth	Cable Length Range
62.5/125 micron MMF	160 MHz/km	2 - 550 m (7 - 1805 ft)
50/125 micron MMF	400 MHz/km	2 - 550 m (7 - 1805 ft)
	500 MHz/km	2 - 550 m (7 - 1805 ft)
9/125 micron SMF	N/A	2 m - 5 km (7 - 16,404 ft)

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

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