3com 3000 TX Manuel D’Utilisation
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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.
slightly different to those for 10Mbps Ethernet.
illustrates the key topology rules and pro-
vides examples of how they allow for large-scale
Fast Ethernet networks.
Fast Ethernet networks.
The key topology rules are:
■
Maximum UTP cable length is 100m (328ft) over
category 5 cable.
category 5 cable.
■
A 412m (1352ft) fiber run is allowed for connect-
ing for switch to switch, or endstation to switch,
using half-duplex 100BASE-FX.
ing for 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 a 100m (328ft) UTP run from a repeater out
to the endstations.
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 a 100m (328ft) UTP run from a repeater out
to the endstations.
Configuration Rules with Full Duplex
The Switch 3000 TX provides full duplex support
for all its fixed ports, and Fast Ethernet Plug-in
Module ports. Full duplex allows frames to be trans-
mitted and received simultaneously and, in effect,
doubles the potential throughput of a link.
for all its fixed ports, and Fast Ethernet Plug-in
Module ports. Full duplex allows frames to be trans-
mitted and received simultaneously and, in effect,
doubles the potential throughput of a link.
With full duplex, the topology rules are:
■
Maximum UTP cable length is 100m (328ft) over
category 5 cable
category 5 cable
■
A 2km (6562ft) fiber run is allowed for connect-
ing switch to switch, or endstation to switch
ing switch to switch, or endstation to switch