(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
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
. 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
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