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2-2 C
HAPTER
2: I
NSTALLATION
AND
S
ETUP
Configuration Rules for Fast Ethernet
The topology rules for 100Mbps Fast Ethernet are
slightly different to those for 10Mbps Ethernet.
Figure 2-1 illustrates the key topology rules and pro-
vides examples of how they allow for large-scale
Fast Ethernet networks.
The key topology rules are:
■
Maximum UTP cable length is 100m (328ft) over
category 5 cable.
■
A 412m (1352ft) fiber run is allowed for connect-
ing switch to switch, or endstation to switch,
using half-duplex 100BASE-FX.
■
A total network span of 325m (1066ft) is allowed
in single-repeater topologies (one hub stack per
wiring closet with a fiber run to the collapsed
backbone). For example, a 225m (738ft) fiber
downlink from a repeater to a router or switch,
plus 100m (328ft) UTP run from a repeater out to
the endstations.
Configuration Rules with Full Duplex
The Switch provides full duplex support for all its
fixed Ethernet and Fast Ethernet ports, and Fast
Ethernet Plug-in Module ports. Full duplex allows
frames to be transmitted and received simulta-
neously and, in effect, doubles the potential
throughput of a link.
With full duplex, the Ethernet topology rules are the
same, but the Fast Ethernet rules are:
■
Maximum UTP cable length is 100m (328ft) over
category 5 cable
■
A 2km (6562ft) fiber run is allowed for connect-
ing switch-to-switch, or endstation-to-switch