3Com 3C16980 User Guide - Page 21

Configuration Rules with Full Duplex, of a link.

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Configuration Rules with Full Duplex 21 The key topology rules are: s Maximum UTP cable length is 100m (328ft) over Category 5 cable. s A 412m (1352ft) fiber run is allowed for connecting switch-to-switch, or endstation-to-switch, using half-duplex 100BASE-FX. s 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 link from a repeater to a router or switch, plus a 100m (328ft) UTP link from a repeater out to the endstations. Configuration Rules with Full Duplex The Switch provides full duplex support for all its ports, including Expansion Module ports. Full duplex allows packets to be transmitted and received simultaneously 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: s Maximum UTP cable length is 100m (328ft) over Category 5 cable. s A 2km (6562ft) fiber link is allowed for connecting switch-to-switch, or endstation-to-switch.

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Configuration Rules with Full Duplex
21
The key topology rules are:
■
Maximum UTP cable length is 100m (328ft) over Category 5 cable.
■
A 412m (1352ft) fiber run is allowed for connecting 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 link from a
repeater to a router or switch, plus a 100m (328ft) UTP link from a
repeater out to the endstations.
Configuration Rules
with Full Duplex
The Switch provides full duplex support for all its ports, including
Expansion Module ports. Full duplex allows packets to be transmitted and
received simultaneously 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 link is allowed for connecting switch-to-switch,
or endstation-to-switch.