SMC Networks SMC6724L2 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 Fiber Optic Cable Distance for 1000BASE-SX

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

100 Mbps Fast Ethernet Collision Domain

SMC 3-2 Rule for Class II Repeaters

Between any two PCs or other stations in the same 100BASE-TX collision domain, there may be:

•up to 3 link segments and

•up to 2 Class II repeaters (hubs)

SMC 2-1 Rule for Class I Repeaters

Between any two PCs or other stations in the same 100BASE-TX collision domain, there may be:

•up to 2 link segments and

•up to 1 Class I repeater (hub)

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