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Introduction6

Topology

A Fast Ethernet workgroup is configured in a star topology and is built

around a maximum of two repeaters. Each workgroup forms a separate

LAN (also known as a segment or collision domain), and these workgroups

can be easily interconnected through switches, bridges, or routers to form

one LAN large enough to encompass a high-rise building or campus envi-

ronment. Recent innovations in LAN hub technology such as stackable

hubs, coupled with the decreasing cost of switches, bridges, and routers,

allow the design of low-cost, efficient Fast Ethernet workgroups and enter-

prise LANs.

The following factors strongly influence the architecture of Fast Ethernet

networks:

•

The EIA/TIA 568 Wiring Standard imposes a 100 meter limit on

horizontal runs of twisted-pair cables; that is, connections from the

wiring closet to the end-station.

•

Fast Ethernet’s increased operational speed reduces the maximum

distance between all elements of the LAN (see below).

•

The EIA/TIA 568 Wiring Standard does not support the use of co-

axial cables for horizontal wiring.

Network Diameter

Network diameter, which is the distance between two end-stations in the

same collision domain, is the primary difference between traditional

Ethernet and Fast Ethernet. Due to the increased speed in Fast Ethernet and

adherence to the EIA/TIA 568 wiring rules, the network diameter of a Fast

Ethernet collision domain is limited to 205 meters; in contrast, the maxi-

mum 10BASE-T Ethernet collision domain diameter can be up to 500

meters.

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D-Link DFE-908x Manual de usuario Pagina 18