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CDDI (Copper Distributed Data Interface)

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CDDI is a version of FDDI (Fiber Distributed Data Interface) designed to run on shielded and unshielded twisted-pair cable. CDDI was developed separately by Cabletron and Crescendo. The companies then combined their technology work and received ANSI standards approval in 1993. A typical CDDI network consists of concentrators with a number of ports for the connection of workstations. Because CDDI has limited cable distances, a CDDI concentrator can connect to an FDDI ring as a subnetwork.

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