CDDI

CDDI is an acronym for Copper Distributed Data Interface. CDDI is a relatively a new version of FDDI. FDDI is an older technology as compared to the CDDI and it was used widely before the CDDI. FDDI is an acronym for Fiber Distributed Data Interface. The major difference between the CDDI and FDDI is that, the CDDI is specifically designed to run on shielded and un-shielded twisted pair cable and along with that CDDI has the copper wire, but FDDI has fiber optic lines as it cannot run on other lines. Even though CDDI is a newer version of the FDDI, still it was not manufactured or introduced to the world by the producers of the FDDI. CDDI was separately developed by Crescendo and Cabletron, however, before these could be given approval for their, this development they had combine their technology work.

In the networking world, a typical CDDI network consists of concentrators with a number of ports to provide connections for the workstations, thus enabling a number of people to join to a network at one time, however, unlike FDDI, CDDI has limited cable distance and it cannot be connected with the FDDI ring as a subnetwork. The maximum distance of CDDI is up to 200 meters and which is quite short as compared to the FDDI cable length.

In today’s networking world for the LAN, CDDI is a standard choice for transmission of data based on the FDDI. CDDI is capable of supporting the dual ring capacity of 200 Mbps, thus giving more speed for data transmission as compared to the FDDI. In the market today CDDI has another official name as well and that name is Twisted Pair Physical Medium Dependent or TP-PMD standard, along with this it is often referred as Twisted Pair Distributed Data Interface or TP-DDI.