Fiber Distributed Data Interface Networks
A typical Fiber Distributed Data Interface (FDDI) network is based on a dual counter-rotating ring, as illustrated in FIGURE 5-2. Each FDDI station is connected in sequence to two rings simultaneously—a primary ring and a secondary ring. Data flows in one direction on the primary ring and in the other on the secondary ring.
Figure 5-2. Typical FDDI Dual Counter-Rotating Ring
The secondary ring serves as a redundant path. It is used during station initialization and can be used as a backup to the primary ring in the event of a station or cable failure. When a failure occurs, the dual ring is “wrapped” around ...
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