Fiber Distributed Data Interface (FDDI)
Fiber Distributed Data Interface (FDDI) is a token-passing ring network that operates at 100 Mbps and over fiber optic cable.
The FDDI standard assumes a maximum of 1000 stations and a 200 km (120 miles) path (repeater every 2 km).
FDDI uses two rings (primary for data and secondary for a backup circuit)
=> two types of stations (single attachment and dual attachment stations (SAS), (DAS))
MAC is a variation of the token passing standard for token ring networks (IEEE 802.5).
several types: (e.g., FDDI-C = FDDI on copper, and FDDI-II = FDDI for voice and video).