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FDDI is an excellent medium for building backbones of LANS.
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standard: ANSI X3T9.5; media: optical fiber
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media access: Timed Token Passing Dual Ring
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bandwidth: 100 Mbps (FDDI network actually has a 125 Mbps signaling rate, however 4B/5B (Differential Manchester) encoding takes up to 25 Mbps)
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max frame size: 4500 Bytes; max nodes: 500
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max interstation distance: 2 km; max distance: 100 km (60 miles)
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topology: dual ring (for redundancy); stations act as repeaters; DAS - Dual Attached Station is attached to both rings; 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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