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Introduction
Cables and Connectors
Category 5 unshielded twisted-pair (UTP) cables are supported. Cat 5 UTP
cable uses the same RJ-45 connector used with 10BASE-T, wired in exactly
the same configuration. However, the punch-down blocks in the wiring
closet must be Category 5 certified. Where these blocks do not meet the
standard, an upgrade is necessary.
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
environment. 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
enterprise 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
coaxial cables for horizontal wiring.