92
C
6: F
D
D
I
(FDDI)
HAPTER
IBER
ISTRIBUTED
ATA
NTERFACE
Physical Topology: A Ring of Trees
The FDDI ring consists of dual-attach stations (DASs) and dual-attach
connectors (DACs). The DACs on the ring allow you to attach trees. The
trees consist of branches of single-attach stations (SASs) and DASs that
are star-wired off of the concentrators. This kind of network is highly
reliable, provides a single, fault-tolerant ring, offers fault isolation, and
allows centralized management. See Figure 15.
Figure 15 Ring of Trees
Duplex link
FDDI trunk ring
CoreBuilder ®
CoreBuilder
9000
9000
CoreBuilder ®
CoreBuilder
3500
9000
CoreBuilder
3500
CoreBuilder
3500
CoreBuilder
3500
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