Fiber Distributed Data Interface - Definition. Was ist Fiber Distributed Data Interface
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Was (wer) ist Fiber Distributed Data Interface - definition

STANDARD FOR DATA TRANSMISSION IN A LOCAL AREA NETWORK
FDDI; Fddi; Fibre Distributed Data Interface; CDDI; Fddi ring; Fiber distributed data interface; ISO 9314; ISO 9314-2; Fibre-Distributed-Data-Interface; Copper Distributed Data Interface

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. (1994-12-13)
Copper Distributed Data Interface         
(CDDI) FDDI running over conventional copper cables. A Cisco/Crescendo copyright term(?). All FDDI connections, single-attached or dual-attached, can be either optical fibre or copper. (1994-12-14)
CDDI         
Copper Distributed Data Interface (Reference: FDDI, UTP)

Wikipedia

Fiber Distributed Data Interface

Fiber Distributed Data Interface (FDDI) is a standard for data transmission in a local area network. It uses optical fiber as its standard underlying physical medium, although it was also later specified to use copper cable, in which case it may be called CDDI (Copper Distributed Data Interface), standardized as TP-PMD (Twisted-Pair Physical Medium-Dependent), also referred to as TP-DDI (Twisted-Pair Distributed Data Interface).

FDDI was effectively made obsolete in local networks by Fast Ethernet which offered the same 100 Mbit/s speeds, but at a much lower cost and, since 1998, by Gigabit Ethernet due to its speed, and even lower cost, and ubiquity.