Abbreviation of Copper Data Distribution Interface,
technology capable of carrying data at 100 Mbps
over unshielded twisted pair (UTP)
cable. CDDI is a trade name of Crescendo Communications (acquired by Cisco Systems in 1993) and commonly used instead of the general term Twisted Pair Physical Layer Medium (TP-PMD).
TP-PMD is the general ANSI
standard name for this FDDI
CDDI cable lengths are limited to 100 meters.