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2 definitions found
 for FDDI
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :

         Fiber Distributed Data Interface (ANSI, ISO 8314)

From The Free On-line Dictionary of Computing (30 December 2018) :

  Fiber Distributed Data Interface
     (FDDI) A 100 Mbit/s ANSI standard local area network
     architecture, defined in X3T9.5.  The underlying medium is
     optical fibre (though it can be copper cable, in which case
     it may be called CDDI) and the topology is a
     dual-attached, counter-rotating token ring.
     FDDI rings are normally constructed in the form of a "dual
     ring of trees".  A small number of devices, typically
     infrastructure devices such as routers and concentrators
     rather than host computers, are connected to both rings -
     these are referred to as "{dual-attached".  Host computers
     are then connected as single-attached devices to the
     routers or concentrators.  The dual ring in its most
     degenerate form is simply collapsed into a single device.  In
     any case, the whole dual ring is typically contained within a
     computer room.
     This network topology is required because the dual ring
     actually passes through each connected device and requires
     each such device to remain continuously operational (the
     standard actually allows for optical bypasses but these are
     considered to be unreliable and error-prone).  Devices such as
     workstations and minicomputers that may not be under the
     control of the network managers are not suitable for
     connection to the dual ring.
     As an alternative to a dual-attached connection, the same
     degree of resilience is available to a workstation through a
     dual-homed connection which is made simultaneously to two
     separate devices in the same FDDI ring.  One of the
     connections becomes active while the other one is
     automatically blocked.  If the first connection fails, the
     backup link takes over with no perceptible delay.
     Usenet newsgroup: news:comp.dcom.lans.fddi.

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