CDDI

CDDI


  • Short for Copper Distributed Data Interface, CDDI is officially called TP-PMD (Twisted-Pair Physical Medium Dependent) and is a data transmission standard. CDDI uses either STP or UTP copper wire and based on FDDI (Fiber Distributed Data Interface) which uses fiber optic lines instead of copper wires.

  • CDDI can be supports distances up to 200 meters and has dual-ring capacity of 200 Mbps, unlike FDDI, which supports distances much greater than 200 meters, but only has a capacity of 100 Mbps. It conforms to the OSI model and is defined by the American National Standards Committee X3-T9.5. CDDI was adopted into the X3-T9.5 standard in 1994.


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