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topology: dual ring (for redundancy); during normal operation, the primary ring is used for data transmission, the secondary ring remains idle; traffic on each ring flows in opposite directions (called counter-rotating);stations act as repeaters
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DAS - Dual Attached Station is attached to both rings
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SAS - Single Attached Station is attached only to the primary ring
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connectors: ST, MIC, SMA906; status: mature, reliable and proven
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transition modes: asynchronous - traffic is not prioritized; synchronous - allows for prioritization of time-sensitive traffic; circuit-based (in FDDI II only) -allows for dedicated communication line with guaranteed bandwidth
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