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| Fiber Distributed Data Interface (FDDI) A 100 Mbit/s architecture, defined in X3T9.5. The underlying medium is (though it can be copper cable, in which case it may be called ) and the topology is a , counter-rotating . FDDI rings are normally constructed in the form of a "dual ring of trees". A small number of devices, typically infrastructure devices such as s and s rather than computers, are connected to both rings - these are referred to as "". Host computers are then connected as devices to the s or s. 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 s and s that may not be under the control of the s 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 through a 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. newsgroup: {news:comp.dcom.lans.fddi}. (1994-12-13) |
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