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Characteristics of FDDI technology
1
FDDI LANs offer high security and safety. The fiber-optic media
does not emit or degrade from electromagnetic radiation. It does
not corrode or present a shock hazard.
An FDDI LAN requires two independent data paths: the primary
and secondary rings. In dual-attached stations (DAS), one optical
transceiver services the primary ring output and secondary ring
input. The second optical transceiver services the primary ring
input and the secondary ring output. Using two rings and two
optical transceivers allows the network to be rerouted whenever a
station fails.
A single-attached station (SAS) can be connected to an FDDI LAN
by using a concentrator. An SAS station has a lower cost than a DAS
station, but does not provide the same network reliability.
The simple network in
Figure 1-3
illustrates the major components
of an FDDI LAN. Network configuration will vary, depending
upon the application.
1-7
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