FDDI
The FDDI standard is actually a set of standards that was established by the American National Standards Institute (ANSI). FDDI uses a ring architecture that is token based. FDDI design consists of two counter-rotating rings. One is an active ring on which data is transmitted. The other is a fail-over ring. A station attached to both the primary and secondary ring is called a dual-attached station (DAS). A station that is connected to the primary ring and not the secondary ring is called a single-attached station (SAS).
In the event of a station failure or cable break, the primary and secondary rings are connected together to form one ring. This is called wrapping. This enables the FDDI ring to continue to operate even after ...
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