SMC Networks SMC6724L2 Manuel d'utilisateur télécharger pdf (Page 29)

ETWORK

LANNING

2-5

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

100 Mbps Fast Ethernet Collision Domain

SMC 3-2 Rule for Class II Repeaters

SMC 2-1 Rule for Class I Repeaters

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)

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)

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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SMC Networks SMC6724L2 Manuel d'utilisateur Page 29