FDDI is an abbreviation for Fiber Distributed Data Interface. It’s a set of ANSI and ISO standards for transmitting data on fiber optic cables in a local area network(LAN) at a rate of around 100,000,000 bits-per-second. The LAN range can extend upto 200kms and the data transmission is 10 times as fast as ethernet, and about twice as fast as T-3. The FDDI protocol is based on the Token Ring protocol.
In addition to it being large geographically, an FDDI local area network can support thousands of users. FDDI networks are typically used as backbones for wide-area networks.
An FDDI network contains two token rings, The primary ring offers up to 100 Mbps capacity and the secondary ring is for possible backup in case the primary ring fails. If the secondary ring is not needed for backup, it can be used to carry data, extending the capacity to 200 Mbps. The single ring can extend the maximum distance; a dual ring can extend for 100 km.
An extension to FDDI, called FDDI-2, supports the transmission of voice and video information as well as data. Another variation of FDDI, called FDDT – Full Duplex Technology uses the same network infrastructure but can potentially support data rates up to 200 Mbps.
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