PCI FX-05SC, User Manual

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Two or more hubs can be connected via twisted-pair cables to provide
additional ports for PCs/ network devices. This scheme is called
“
cascade
c o n n e c t i o n
”
or cascading. Any two 100BASE-TX repeater hubs can be
cascaded as long as they comply with IEEE802.3u 100BASE-TX Class II
standard. However, certain restrictions apply to cascading multiple
10BASE-T/ 100BASE-TX repeater hubs. Great attention should be given
to 100BASE-TX cascading as their restrictions are more severe compared to
those applied to 10BASE-T cascading. Please see the table below and
Figure C-1 and C-2 for more information on cascading limitations for
10BASE-T/ 100BASE-TX networks.
A switching hub can be inserted in the network to relieve these limitations.
Once inserted in a network, the switching hub can
“
r e s e t
”
the node-to-
node distance as well as the cascading stage count. In the case of
100BASE-T, the user can extend a network to an infinite distance as long as
a switching hub is used every 205 meters (see Figure C-3 below). Similarly,
it is possible to construct an infinitely long 10BASE-T network so long as a
switching hub is used every 500 meters.
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FX-05SC
Appendix C
Limitations on Cascading Multiple Hubs